KUBOTA U48-4 EXCAVATOR Service Repair Manual


KUBOTA EXCAVATOR

KiSC issued 03, 2010 A


TO THE READER
TO THE READER
INFORMATION
CONTENTS
INFORMATION
1. SAFETY FIRST ............................................ I-1
2. SAFETY DECALS ........................................ I-4
GENERAL
CONTENTS
GENERAL
1. CHECKING EXCAVATOR
IDENTIFICATION ........................................G-1
2. ENGINE IDENTIFICATION .........................G-2
3. GENERAL PRECAUTIONS.........................G-4
4. HANDLING PRECAUTIONS FOR
ELECTRICAL PARTS AND WIRING...........G-8
5. TIGHTENING TORQUES..........................G-12
6. NEW PRODUCT FEATURE
(EUROPEAN VERSION) ...........................G-17
7. NEW FEATURES OUTLINE......................G-20
8. QUALITY SPECIFICATIONS ....................G-22
9. WATER AND OIL QUANTITY ...................G-33
10. DESCRIPTION OF PARTS .......................G-34
11. MAINTENANCE CHECK LIST ..................G-41
MACHINE BODY
CONTENTS
SERVICING
1. FRONT OPERATING MACHINE............... 1-S1
2. SWIVEL FRAME........................................ 1-S3
3. TRACK FRAME ....................................... 1-S21
ENGINE
CONTENTS
GENERAL
1. ENGINE .....................................................2-G1
2. SPECIAL TOOLS ......................................2-G5
MECHANISM
1. FEATURE ................................................. 2-M1
2. ENGINE BODY......................................... 2-M2
3. LUBRICATING SYSTEM.......................... 2-M7
4. COOLING SYSTEM ................................. 2-M8
5. FUEL SYSTEM....................................... 2-M10
SERVICING
1. TROUBLESHOOTING............................... 2-S1
2. SERVICING SPECIFICATIONS ................ 2-S4
3. TIGHTENING TORQUES........................ 2-S10
4. CHECKING, DISASSEMBLING AND
SERVICING............................................. 2-S13
HYDRAULIC SYSTEM
CONTENTS
MECHANISM
1. DIAGRAM OF HYDRAULIC CIRCUIT...... 3-M1
2. HYDRAULIC DEVICE LAYOUT ............... 3-M3
3. FEATURES............................................... 3-M4
4. PUMP ....................................................... 3-M8
5. CONTROL VALVE.................................. 3-M32
6. SWIVEL MOTOR.................................... 3-M54
7. TRAVEL MOTOR.................................... 3-M60
8. HYDRAULIC CYLINDER ........................ 3-M82
9. PILOT VALVE......................................... 3-M92
10. UNLOAD VALVE .................................. 3-M103
11. HOLDING VALVE................................. 3-M107
12. SERVICE PORT ................................... 3-M111
SERVICING
1. PUMP.........................................................3-S1
2. CONTROL VALVE...................................3-S34
3. SWIVEL MOTOR .....................................3-S63
4. SWIVEL JOINT........................................3-S77
5. TRAVEL MOTOR.....................................3-S81
6. HYDRAULIC CYLINDER .......................3-S140
7. PILOT VALVE (CONTROL) ...................3-S153
8. PILOT VALVE (TRAVEL).......................3-S163
9. PILOT VALVE (BLADE, SWING)...........3-S173
10. UNLOAD VALVE ...................................3-S184
11. THIRD LINE VALVE ASSEMBLY..........3-S189
12. ROUTING OF HYDRAULIC HOSES.....3-S191
13. BOOM HOLDING VALVE......................3-S217
14. MEASURING HYDRAULIC DEVICE
PERFORMANCE...................................3-S223
15. TROUBLESHOOTING...........................3-S244
ELECTRICAL SYSTEM
CONTENTS
SERVICING
1. ELECTRONIC DEVICE LAYOUT..............4-S1
2. WIRING CIRCUIT......................................4-S2
3. TROUBLESHOOTING (START-UP
EQUIPMENT VERSION) .........................4-S13
4. INSPECTIONS.........................................4-S15
5. Instrument Panel Operating Guide ..........4-S22
6. TROUBLESHOOTING (METER
PANEL EDITION) ....................................4-S77
CABIN
CONTENTS
MECHANISM
1. AIR CONDITIONING SYSTEM................. 5-M1
2. WIPER .................................................... 5-M20
SERVICING
1. TROUBLESHOOTING...............................5-S1
2. MAINTENANCE AND
SERVICE RELATED SPECIFICATIO
NS..............................................................5-S4
3. TORQUE....................................................5-S5
4. PRECAUTIONS WHEN REPAIRING
THE REFRIGERANT SYSTEM .................5-S6
5. INSPECTING AND CHARGING THE
REFRIGERANT SYSTEM .......................5-S12
6. INSPECTION AND DISASSEMBLY ........5-S21
7. CABIN REMOVAL AND MOUNTING ......5-S38
8. WINDOW WASHER ................................5-S40
9. LIGHTING DEVICES (CAB WORK
LIGHT, INTERIOR LIGHT) ......................5-S43
10. REMOVAL AND INSTALLATION OF
GLASS.....................................................5-S46
11. FRONT WINDOW....................................5-S49


This Workshop Manual provides service personnel with information about the mechanisms, service
and maintenance of the construction machinery. This Workshop Manual is divided into 3 sections,
General, Mechanisms and Service.

This section contains information such as engine and equipment ID numbers, general precautions,
maintenance schedules, inspections and maintenance items and special tools.

This section describes the structure of mechanisms and explains their functions.Be sure that you
fully understand this Mechanisms section prior to performing any service work, such as troubleshooting
or when performing any disassembly or assembly work.

This section contains information and procedures for performing maintenance on the backhoe, such
as troubleshooting, service specification tables, torque specifications, items to be inspected and
adjusted, disassembly and assembly procedures, as well as precautions, maintenance standard values
and usage limits.
All of the illustrations, specifications and other information in this manual were created based on the
latest model at the time of publication.
Please be aware that changes to the content may be made without prior notice.

 


 
U48-4
U55-4
For European Union V2607-DI-E3-BH

TO THE READERU48-4,U55-4, WSM
-2




  





 


1. SAFETY FIRST .............................................................................................................................. I-1
2. SAFETY DECALS .......................................................................................................................... I-4


INFORMATIONU48-4,U55-4, WSM
I-1
 
RY9212007INI0001US0

• Read all instructions and safety instructions in this
manual and on your engine safety decals.
• Clean the work area and engine.
• Park the machine on a stable and level ground.
• Let the temperature of the engine decrease before
you start a job.
• Stop the engine, then remove the key.
• Disconnect the battery negative cable.
• Hang a   tag in the operator
station.
RY9212007INI0002US0

• Do not do the procedures below when you start the
engine.
– short across starter terminals
– bypass the safety start switch
• Do not make unauthorized modifications to the
engine. This can cause damage and decrease the
engine life.
RY9212007INI0003US0

 

 


 

 

              


 

 

I-2

• Do not use the machine after you consume alcohol
or medication or when you are tired.
• Put on applicable clothing and safety equipment.
• Use applicable tools only. Do not use alternative
tools or parts.
• When 2 or more persons do servicing, make sure
that you do it safely.
• Do not touch the hot parts or parts that turn when the
engine operates.
• Do not remove the radiator cap when the engine
operates, or immediately after it stops. If not, hot
water can spout out from the radiator. Only remove
the radiator cap when it is at a sufficiently low
temperature to touch with bare hands. Slowly loosen
the cap to release the pressure before you remove it
fully.
• Released fluid (fuel or hydraulic oil) under pressure
can cause damage to the skin and cause serious
injury. Release the pressure before you disconnect
hydraulic or fuel lines. Tighten all connections before
you apply the pressure.
• Do not open a fuel system under high pressure.
The fluid under high pressure that stays in fuel lines
can cause serious injury. Do not disconnect or repair
the fuel lines, sensors, or any other components
between the fuel pump and injectors on engines with
a common rail fuel system under high pressure.
• Put on an applicable ear protective device (earmuffs
or earplugs) to prevent injury against loud noises.
• Be careful about electric shock. The engine
generates a high voltage of more than DC100 V in
the ECU and is applied to the injector.
RY9212007INI0004US0

• Fuel is very flammable and explosive under some
conditions. Do not smoke or let flames or sparks in
your work area.
• To prevent sparks from an accidental short circuit,
always disconnect the battery negative cable first
and connect it last.
• The battery gas can cause an explosion. Keep the
sparks and open flame away from the top of battery,
especially when you charge the battery.
• Make sure that you do not spill fuel on the engine.
RY9212007INI0005US0

I-3

• If the engine is in operation, make sure that the area
has good airflow. Do not operate the engine in a
closed area. The exhaust gas contains poisonous
carbon monoxide.
RY9212007INI0006US0

• Do not discard fluids on the ground, down the drain,
into a stream, pond, or lake. Obey related
environmental protection regulations when you
discard oil, fuel, coolant, electrolyte and other
dangerous waste.
RY9212007INI0007US0

• Keep electrolyte away from your eyes, hands and
clothing. Sulfuric acid in battery electrolyte is
poisonous and it can burn your skin and clothing and
cause blindness. If you spill electrolyte on yourself,
clean yourself with water, and get medical aid
immediately.
RY9212007INI0008US0

• Keep a first aid kit and fire extinguisher ready at all
times.
• Keep emergency numbers for doctors, ambulance
service, hospital and fire department near your
telephone at all times.
RY9212007INI0009US0

I-4
 



RY9212007INI0010US0

(1) Part No. TA040-49580 - Do not touch hot parts such as exhaust etc.
(2) Part No. RC418-57370 - Keep away from fan and fan belt.
(3) Part No. RA028-57240 - Attention to the danger of burning.
RY9212007INI0011US0

I-5
(1) Part No. RD809-57450 - Do not touch hot parts such as exhaust etc.
(2) Part No. RD809-57250 - Do not allow any persons within the working range.
(3) Part No. T1060-30090 - Keep sparks, flame, cigarettes away.
(4) Part No. TD179-30130 - Battery recycle label
(5) Part No. RD359-57840 - Battery cut switch label
RY9212007INI0012US0

I-6
(1) Part No. RD809-57390 - When using a wider or deeper bucket, take good care when swinging or pulling in
the front attachments to make sure that the bucket does not hit the cab.
(2) Part No. RB419-57930 - Label front door lock
(3) Part No. RD809-57430 - Fasten the seatbelt.
(4) Part No. 69198-57840 - Label manual
(5) Part No. RA228-93380 - Anti-theft system
(6) Part No. RD809-57140 - Emergency exit
RY9212052INI0001US0

I-7
(1) Part No. RD809-57950 - For information about loosening the crawler, consult the operating instructions.
(2) Part No. RC108-57960 - Attachment point for lifting gear.
(3) Part No. RD809-57250 - Do not enter the manoeuvring area.
(4) Part No. RB419-57960 - Not an attachment point for lifting gear!
(5) Part No. RD451-57480 - Diesel fuel only, no open fire.
(6) Part No. RA809-57330 - Use the attachment point only for clamping the excavator securely to a transport
vehicle.
(7) Part No. RD359-57260 - Fuel supply label
RY9212052INI0002US0

I-8

1. Keep danger, warning and caution labels clean and free from obstructing material.
2. Clean danger, warning and caution labels with soap and water, dry with a soft cloth.
3. Replace damaged or missing danger, warning and caution labels with new labels from your KUBOTA dealer.
4. If a component with danger, warning and caution label(s) affixed is replace with new part, make sure new label(s)
is (are) attached in the same locations(s) as the replace component.
5. Mount new danger, warning and caution labels by applying on a clean dry surface and pressure any bubbles to
outside edge.
RY9212007INI0015US0

 


1. CHECKING EXCAVATOR IDENTIFICATION .............................................................................. G-1
2. ENGINE IDENTIFICATION .......................................................................................................... G-2
[1] MODEL NAME AND SERIAL NUMBER ................................................................................ G-2
[2] E3B ENGINE .......................................................................................................................... G-3
[3] CYLINDER NUMBER............................................................................................................. G-3
3. GENERAL PRECAUTIONS.......................................................................................................... G-4
4. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING .................................... G-8
[1] WIRING .................................................................................................................................. G-8
[2] FUSES.................................................................................................................................. G-10
[3] CONNECTOR ...................................................................................................................... G-10
[4] WASHING THE EXCAVATOR WITH A HIGH-PRESSURE WASHER................................ G-11
5. TIGHTENING TORQUES........................................................................................................... G-12
[1] GENERAL USE SCREWS, BOLTS AND NUTS .................................................................. G-12
[2] STUD BOLTS ....................................................................................................................... G-12
[3] TORQUE FOR HYDRAULIC HOSE FITTINGS ................................................................... G-13
(1) Torque for Hydraulic Hose Fittings................................................................................. G-13
(2) Torques of Lock-Nuts for Elbows with Male Seats and Adaptors with O-rings
(Straight Threads)........................................................................................................... G-14
(3) Torque for Tapering Adaptors ........................................................................................ G-14
[4] HOSE CLAMP SCREW TORQUE ....................................................................................... G-15
6. NEW PRODUCT FEATURE (EUROPEAN VERSION) .............................................................. G-17
7. NEW FEATURES OUTLINE....................................................................................................... G-20
8. QUALITY SPECIFICATIONS ..................................................................................................... G-22
9. WATER AND OIL QUANTITY .................................................................................................... G-33
10. DESCRIPTION OF PARTS ........................................................................................................ G-34
[1] BUCKET ............................................................................................................................... G-34
(1) Bucket dimensions ......................................................................................................... G-34
(2) Bucket installation relevant dimensions.......................................................................... G-35
[2] RUBBER CRAWLER............................................................................................................ G-36
[3] STEEL CRAWLER ............................................................................................................... G-36
[4] TRUCK ROLLER, IDLER, SPROCKET ............................................................................... G-37
[5] CYLINDER .......................................................................................................................... G-38
[6] PARTS WEIGHT .................................................................................................................. G-39
11. MAINTENANCE CHECK LIST ................................................................................................... G-41


GENERALU48-4,U55-4, WSM
G-1
 
When consulting with your local KUBOTA dealer about this
mini-excavator, please provide the model of the mini-excavator, its
frame and engine numbers and the number of hours on the hour
meter.
RY9212032GEG0003US0
(1) Mini-excavator Nameplate
(Model, frame number, engine
number)
(2) Frame Number
(3) Engine Number
 

G-2
 
 
Be sure to check the engine nameplate and serial number when
you wish to consult about the engine.
The model and serial number of the engine need to be checked
prior to servicing the engine or replacing any of its parts.

The engine serial number is the numerical ID of the engine and
is printed after the engine's model number.
The year and month of manufacture are indicated as follows

*The letters , , ,  and  are not used.

*The letter  and  are not used.
e.g. V2607
(a)
- 8
(b)
H
(c)
A001
(d)
RY9212001END0009US0






1 2001 F 2015
2 2002 G 2016
3 2003 H 2017
4 2004 J 2018
5 2005 K 2019
6 2006 L 2020
7 2007 M 2021
8 2008 N 2022
9 2009 P 2023
A 2010 R 2024
B 2011 S 2025
C 2012 T 2026
D 2013 V 2027
E 2014
 
January A0001 to A9999 B0001 to BZ999
February C0001 to C9999 D0001 to DZ999
March E0001 to E9999 F0001 to FZ999
April G0001 to G9999 H0001 to HZ999
May J0001 to J9999 K0001 to KZ999
June L0001 to L9999 M0001 to MZ999
July N0001 to N9999 P0001 to PZ999
August Q0001 to Q9999 R0001 to RZ999
September S0001 to S9999 T0001 to TZ999
October U0001 to U9999 V0001 to VZ999
November W0001 to W9999 X0001 to XZ999
December Y0001 to Y9999 Z0001 to ZZ999
(a) Engine Model : 
(b) Year Manufactured : The  indicates .
(c) Month : April is indicated by either  or .
(d) Lot Number : (Either  or )
(1) Engine Model and Serial Number

G-3
 
[Ex. : Engine Model V2607-DI-E3B-XXXX]
While the exhaust emissions regulations in each country that have been implemented to date to prevent air
pollution are constantly changing, regulations governing off-road exhaust emissions are expected to be implemented
more quickly. The date that specific off-road exhaust emissions regulations will take effect depends on the output
category of the engine.
For some years now KUBOTA has been supplying regulation-compliant diesel engines in countries where
off-road exhaust emission regulations have been introduced. KUBOTA's E3B series of engines meet the next phase
of exhaust emission regulations. (See the table below.)
Whenever repairs or service is performed on a ###-E3B series engine, E3B engine replacements parts, which
are in the applicable E3B KUBOTA Parts List, must be used and the KUBOTA Operator's Manual and E3B Workshop
Manual must be used for maintenance. Use of incorrect replacement parts or replacement parts from other emission
level engines (for example : E2B engines), may result in emission levels out of compliance with the original E3B
design, EPA and/or other applicable regulations. Check the output category and emissions data on the emissions
label on the header cover of the engine. E3B engines have the suffix ET after the model name on the EPA label. E3B
is not marked on the engine.
RY9212001END0010US0
 
KUBOTA diesel engines are numbered as indicated in the
figure.
Cylinders are numbered from the front cover (fan side) in the
order 1, 2, 3 and 4.
RY9212001END0011US0
  
K 19 to/not including 37 kW STAGE IIIA
J 37 to/not including 75 kW STAGE IIIA
I 75 to/not including 130 kW STAGE IIIA
  
ET
Less than 19 kW Tier 4
19 to/not including 56 kW Interim Tier 4
56 to/not including 75 kW Tier 3
75 to/not including 130 kW Tier 3
(1) EU Regulation engine output classification
(2) "E3B engines" have the suffix ET after the model name on the EPA label.
"E3B" models meet Tier 3, Interim Tier4 or Tier4 regulations, depending on the
engine output category.

G-4
 
Whenever performing maintenance on the mini-excavator,
always read the Safety Precautions in this manual and the
Operator's Manual carefully, become familiar with them and perform
the work safely.
Before performing any maintenance on the mini-excavator,
make sure it is sufficiently clean and choose a sufficiently clean
location to perform any disassembly.
Before performing maintenance on the mini-excavator, always
disconnect the negative battery cable first.
Whenever a special tool is required, use the special tool that
KUBOTA recommends. Make any special tools that are not used
very frequently according to the diagrams in this manual.
Always use genuine KUBOTA parts to maintain the
performance and safety characteristics of the mini-excavator.
RY9212001GEG0011US0

• Wrap plumber's tape on the threads before tightening taper
couplings. After wrapping (2 wraps) the plumber's tape, tighten
to the specified torque. Once the coupling is tightened, do not
loosen it as this will cause an oil leak.
RY9212001GEG0012US0

• Clean the groove the O-ring goes in and remove any burrs.
Apply grease on the O-ring when inserting it in the groove.
(Except floating seals)
• When putting the O-ring in the groove, be careful as it is easy at
the very end to twist the O-ring against the inside of the groove.
If it gets twisted, roll it gently with your fingertip to untwist it.
RY9212001GEG0013US0

• Do not face the lip of the oil seal in the wrong direction. Face the
main lip toward the material to be sealed.
• After oil seals are replaced, apply grease to the moving parts
around the lip to prevent the dry surfaces from wearing against
each other when the engine is started. If the seal has a dust lip,
fill the gap between the lips with grease.
• As a general rule, use a press to insert the oil seal in place. If
that is not possible, use an appropriate tool to gently and evenly
tap it into place, taking care that it does not go in at a slant.
Press the seal all the way so it seats in the boss.
RY9212001GEG0014US0
(1) Plumber's Tape
(2) External Thread
(3) Internal Thread
(4) Gap
(5) Leave 1 to 2 threads
(1) O-ring Groove
(2) O-ring
(3) Check for burrs
(4) If the ring touches this corner, it will
twist
(1) Gasket
(2) Metal Ring
(3) Spring
(4) Main Lip
(5) Grease
(6) Dust Lip
 
 

G-5

• Be sure to wipe off any oil from the O-ring or surfaces that touch
the O-ring. (For wheel motors, apply a light film)
• When putting an O-ring into a floating seal, make sure the
O-ring does not twist.
• Apply a light film of oil to surrounding surfaces when working to
get the floating seal with O-ring in place; take care that the
surrounding surfaces, O-ring and housing are parallel with each
other.
• After getting the seal in place, turn the engine over 2 or 3
revolutions, to both create a film of oil on surrounding surfaces
and to properly seat the face of the seal.
RY9212001GEG0015US0

• When installing external or internal snap rings, orient them as
shown in the diagram so the angled side faces the direction of
force.
RY9212001GEG0016US0

• When driving a spring pin, face the split in the direction that
receives the force, as shown in the diagram.
RY9212001GEG0017US0

• Clean and dry the area where Locktite will be applied with a
solvent so it is free of moisture, oil and dirt.
• Apply locktite all around the threads of the bolt except the first
set of threads at the tip and fill the grooves between the threads.
If the threads or the grooves are large, adjust the amount of
locktite accordingly and apply it all around the bolt hole as well.
RY9212001GEG0018US0
(1) Surrounding Surfaces (2) O-ring
(1) Position so the angled part receives
the force
 
 
(1) With lateral movement (2) With rotational movement
 
 

 
 
 

G-6

• Tighten bolts and nuts to their specified torque.
• Tighten nuts and bolts alternately top/bottom , left/right so
the torque is distributed evenly.
RY9212001GEG0019US0

• Tighten to their specified torque.
• Before assembling, wipe the inside of metal fittings clean of any
dirt.
• After assembly, put the fitting under normal pressure and check
that it does not leak.
RY9212001GEG0020US0

When assembling an elbow with male seat, adhere to the
following procedures to prevent deformation of O-rings and leaks.
1. Connecting to Valves
• Clean the blow with male seat and the surface of the seal
opposite and mount with the lock-nut on top.
• Finger tighten till it touches the washer.
2. Positioning
• Turn the mouth of the elbow back so it faces the right
direction. (not back over 1 turn)
3. Fasten
• Tighten the lock-nut to the specified torque with a wrench.
RY9212001GEG0021US0
 
 
 
(1) Lock-nut
(2) Washer
(3) Seal (O-ring)
(4) Wrench for holding
(5) Hose
(6) Torque wrench for tightening

G-7

• To remove a quick hose coupling, push the fitting (2) in the
direction of the arrow and pull on the plastic part (1) in the
opposite direction.
• To attach a quick coupler, push it in firmly in the direction of the
arrow. Then check that it will not pull off.
RY9212001GEG0022US0
(1) Plastic part (2) Fitting

G-8
 

Follow the precautions below for handling electrical parts and
wiring to ensure safety and prevent damage to the mini-excavator
and nearby equipment.

       

 
        


RY9212001GEG0023US0
 
• Tighten wiring terminals securely.
RY9212001GEG0024US0
• Keep wiring away from hazards.
RY9212001GEG0025US0
• Immediately repair or replace old or damaged wiring.
RY9212001GEG0026US0
(1) Battery Cable (-) Side (2) Battery Cable (+) Side
(1) Correct (Tightened securely) (2) Incorrect (Poor contact if loose)
(1) Hazardous Positioning
(2) Wiring Position (wrong)
(3) Wiring Position (right)
(4) Hazardous Position
(1) Damaged
(2) Torn
(3) Electrical Tape

G-9
• Insert grommet securely.
RY9212001GEG0027US0
• Clamp wiring securely but do not damage wires with the clamp.
RY9212001GEG0028US0
• Clamp wiring so it is not twisted, pulled too tight or sag too
much. However, moving parts may require play in the wiring.
RY9212001GEG0029US0
• Do not pinch or bind wiring when installing parts.
RY9212001GEG0030US0
• After wiring, double-check terminal protectors and clamps
before connecting battery cables.
RY9212001GEG0031US0
(1) Grommet  
 
(1) Clamp (Spiral clamp around wire)
(2) Wire
(3) Clamp
(4) Welding Mark
(1) Wire
(2) Clamp
 
 
(1) Wire  
(1) Cover (Install covers securely)

G-10
 
• Always use fuses of the specified capacity.
Never use over or undersized fuses.
• Never use copper or steel wire in place of a fuse.
• Do not install accessories such as work lights, radios, etc., if
your mini-excavator does not have an auxiliary circuit.
• Do not install accessories as they will exceed the capacity of
fuses.
RY9212001GEG0032US0
 
• Press the lock to disconnect locking connectors.
RY9212001GEG0033US0
• Hold the connectors when separating them.
• Do not pull on the wire harness to separate the connectors.
RY9212001GEG0034US0
• Straighten bent prongs and make sure none are sticking out or
missing.
• Remove corrosion from terminals with sandpaper.
RY9212001GEG0035US0
• Female connectors must not be spread too far open
RY9212001GEG0036US0
(1) Fuse
(2) Fusible Link
(3) Slow-blow Fuse
 
   
(1) Missing terminal
(2) Bent Prong
(3) Sandpaper
(4) Corrosion
   

G-11
• The plastic covers of connectors must cover them completely.
RY9212001GEG0037US0
 

Using a high-pressure washer incorrectly can lead to personal
injury and/or damage, break or cause parts of the mini-excavator to
fail, so use the power washer properly according to its user's
manual and labels.

 
           


 

 

 


 
 
 
 
RY9212001GEG0038US0
(1) Cover  
 
(1) Do not blast with water
(2) Never wash from too close
 
 
 
 

G-12
 
 


RY9212032GEG0001US0
 
RY9212032GEG0002US0
   
 

     
               

7.9
to
9.3
0.80
to
0.95
5.8
to
6.8
7.9
to
8.8
0.80
to
0.90
5.8
to
6.5
9.81
to
11.2
1.00
to
1.15
7.24
to
8.31
7.9
to
8.8
0.80
to
0.90
5.8
to
6.5
12.3
to
14.2
1.25
to
1.45
9.05
to
10.4

18
to
20
1.8
to
2.1
13
to
15
17
to
19
1.7
to
2.0
13
to
14
24
to
27
2.4
to
2.8
18
to
20
18
to
20
1.8
to
2.1
13
to
15
30
to
34
3.0
to
3.5
22
to
25

40
to
45
4.0
to
4.6
29
to
33
32
to
34
3.2
to
3.5
24
to
25
48
to
55
4.9
to
5.7
36
to
41
40
to
44
4.0
to
4.5
29
to
32
61
to
70
6.2
to
7.2
45
to
52

63
to
72
6.4
to
7.4
47
to
53
– – –
78
to
90
7.9
to
9.2
58
to
66
63
to
72
6.4
to
7.4
47
to
53
103
to
117
10.5
to
12.0
76.0
to
86.7

108
to
125
11.0
to
12.8
79.6
to
92.5
– – –
124
to
147
12.6
to
15.0
91.2
to
108
– – –
167
to
196
17.0
to
20.0
123
to
144

167
to
191
17.0
to
19.5
123
to
141
– – –
197
to
225
20.0
to
23.0
145
to
166
– – –
260
to
304
26.5
to
31.0
192
to
224

246
to
284
25.0
to
29.0
181
to
209
– – –
275
to
318
28.0
to
32.5
203
to
235
– – –
344
to
402
35.0
to
41.0
254
to
296

334
to
392
34.0
to
40.0
246
to
289
– – –
368
to
431
37.5
to
44.0
272
to
318
– – –
491
to
568
50.0
to
58.0
362
to
419
  
      

12
to
15
1.2
to
1.6
8.7
to
11
8.9
to
11
0.90
to
1.2
6.5
to
8.6

25
to
31
2.5
to
3.2
18
to
23
20
to
25
2.0
to
2.6
15
to
18

30
to
49
3.0
to
5.0
22
to
36
31 3.2 23

62
to
73
6.3
to
7.5
46
to
54
– – –

98.1
to
112
10.0
to
11.5
72.4
to
83.1
– – –

172
to
201
17.5
to
20.5
127
to
148
– – –

G-13
 
 

RY9212001GEG0041US0

RY9212001GEG0042US0
Torque
1/8
7.8 to 11.8 N·m
0.8 to 1.2 kgf·m
5.7 to 8.7 lbf·ft
1/4
24.5 to 29.2 N·m
2.5 to 3.0 kgf·m
18.1 to 21.7 lbf·ft
3/8
37.2 to 42.1 N·m
3.8 to 4.3 kgf·m
27.5 to 31.1 lbf·ft
1/2
58.8 to 63.7 N·m
6.0 to 6.5 kgf·m
43.4 to 47.0 lbf·ft
3/4
117.6 to 127.4 N·m
12.0 to 13.0 kgf·m
86.8 to 94.0 lbf·ft
1
181.3 to 191.1 N·m
18.5 to 19.5 kgf·m
133.8 to 141.0 lbf·ft
1-1/4
220.5 to 230.3 N·m
22.5 to 23.5 kgf·m
162.8 to 170.0 lbf·ft
(1) Union Nuts
Torque
1/8
19.6 to 29.4 N·m
2.0 to 3.0 kgf·m
14.5 to 21.7 lbf·ft
1/4
36.6 to 44.1 N·m
3.7 to 4.5 kgf·m
26.8 to 32.5 lbf·ft
3/8
68.6 to 73.5 N·m
7.0 to 7.5 kgf·m
50.6 to 54.2 lbf·ft
1/2
83.4 to 88.3 N·m
8.5 to 9.0 kgf·m
61.5 to 65.1 lbf·ft
3/4
166.6 to 181.3 N·m
17.0 to 18.5 kgf·m
123.0 to 133.8 lbf·ft
(1) Taper

G-14
 

RY9212001GEG0043US0
 
RY9212001GEG0044US0
Torque
1/8
15.0 to 16.5 N·m
1.5 to 1.7 kgf·m
11.1 to 12.2 lbf·ft
1/4
24.5 to 29.4 N·m
2.5 to 3.0 kgf·m
18.1 to 21.7 lbf·ft
3/8
49.0 to 53.9 N·m
5.0 to 5.5 kgf·m
36.1 to 39.8 lbf·ft
1/2
58.8 to 63.7 N·m
6.0 to 6.5 kgf·m
43.4 to 47.0 lbf·ft
3/4, 1
117.6 to 127.4 N·m
12.0 to 13.0 kgf·m
86.8 to 94.0 lbf·ft
1-1/4
220.5 to 230.3 N·m
22.5 to 23.5 kgf·m
162.8 to 170.0 lbf·ft
(1) Lock-nut
(2) Washer
(3) Seal (O-ring)
Torque
1/8
19.6 to 29.4 N·m
2.0 to 3.0 kgf·m
14.5 to 21.7 lbf·ft
1/4
36.6 to 44.1 N·m
3.7 to 4.5 kgf·m
26.8 to 32.5 lbf·ft
3/8
68.6 to 73.5 N·m
7.0 to 7.5 kgf·m
50.6 to 54.2 lbf·ft
1/2
83.4 to 88.3 N·m
8.5 to 9.0 kgf·m
61.5 to 65.1 lbf·ft
3/4
166.6 to 181.3 N·m
17.0 to 18.5 kgf·m
123.0 to 133.8 lbf·ft
(1) Taper

G-15
 

RY9212001GEG0045US0
Torque
10- 14 6C040-58721
2.5 to 3.4 N·m
25 to 35 kgf·cm
1.8 to 2.5 lbf·ft
12- 16 09318-89016
2.5 to 3.4 N·m
25 to 35 kgf·cm
1.8 to 2.5 lbf·ft
19- 25 09318-89024
2.5 to 3.4 N·m
25 to 35 kgf·cm
1.8 to 2.5 lbf·ft
31- 40 09318-89039
2.5 to 3.4 N·m
25 to 35 kgf·cm
1.8 to 2.5 lbf·ft
36- 46 09318-89045
2.5 to 3.4 N·m
25 to 35 kgf·cm
1.8 to 2.5 lbf·ft
44- 53 09318-89052
3.9 to 4.9 N·m
40 to 50 kgf·cm
2.9 to 3.6 lbf·ft
51- 59 09318-89058
3.9 to 4.9 N·m
40 to 50 kgf·cm
2.9 to 3.6 lbf·ft
86- 96 RD809-42241
3.9 to 4.9 N·m
40 to 50 kgf·cm
2.9 to 3.6 lbf·ft

G-16

RY9212001GEG0046US0
Torque
13- 20 RB101-63631
2.5 to 3.4 N·m
25 to 35 kgf·cm
1.8 to 2.5 lbf·ft
15- 25 RC101-64581
4.9 to 5.9 N·m
50 to 60 kgf·cm
3.6 to 4.3 lbf·ft
19- 28 R1401-63211
4.9 to 5.9 N·m
50 to 60 kgf·cm
3.6 to 4.3 lbf·ft
22- 32 R1401-63151
4.9 to 5.9 N·m
50 to 60 kgf·cm
3.6 to 4.3 lbf·ft
26- 38 68311-72821
4.9 to 5.9 N·m
50 to 60 kgf·cm
3.6 to 4.3 lbf·ft
32- 44 RD411-63821
4.9 to 5.9 N·m
50 to 60 kgf·cm
3.6 to 4.3 lbf·ft
44- 56 35820-15181
4.9 to 5.9 N·m
50 to 60 kgf·cm
3.6 to 4.3 lbf·ft
50- 65 RC401-63191
4.9 to 5.9 N·m
50 to 60 kgf·cm
3.6 to 4.3 lbf·ft
58- 75 36919-04591
4.9 to 5.9 N·m
50 to 60 kgf·cm
3.6 to 4.3 lbf·ft
60- 80 RD809-63101
4.9 to 5.9 N·m
50 to 60 kgf·cm
3.6 to 4.3 lbf·ft
68- 85 RD809-63061
4.9 to 5.9 N·m
50 to 60 kgf·cm
3.6 to 4.3 lbf·ft
77- 95 69284-63171
4.9 to 5.9 N·m
50 to 60 kgf·cm
3.6 to 4.3 lbf·ft

G-17
 

* : New Feature
RY9212052GEG0001US0
Basic specification Operation
(1)
Robust Machine Weight (Machine class
upgraded to 5.5 ton)
(13)
Pilot hydraulic remote-control system for all
actuators
(2) V2607 New DI Engine Serviceability
(3) Advanced Three Pump Load Sensing System * (14) Sheet-metal processed covers
(4) Strong bucket breakout force (15) One side engine maintenance
Performance (16) Bush with flange at arm tip end
(5) Bigger Lifting Capacity (17)
Prolonged return filter life 500 hours
1000 hours
(6)
Dual Speed with Auto-shift as standard
(Bigger travel force)
Safety
(7) Higher Blade (18) Travel parking brake as standard
(8)
Shortened distance between blade and bucket
teeth
Others
Operator comfort (19) KUBOTA original digital panel at the Front *
(9) Spacious and comfort cabin (20)
Leading-edge Anti-theft system for greater
security
(10) Powerful Air conditioning (21) Battery Isolator *
Versatility
(11)
AUX1" and "AUX2" with proportional control on
joystick is adopted. *
(12)
The maximum oil flow of both AUX lines can be
adjusted by digital panel. *

G-18


• Engine start safety system on the left console
• Travel motor with disc brake
• Swivel motor with disc brake
• Overload warning buzzer
• KUBOTA original anti-theft system
• Anti-drop valve on the boom (ISO8643)

• Auxiliary hydraulic circuits (SP1 and SP2*) piping to the arm end *for Types L and M.
• 2 working lights on cabin and 1 light on the boom
• 1450 mm arm length (U48-4)
• 1570 mm arm length (U55-4)

• ROPS (Roll-over Protective Structure, ISO3471)
• OPG (Operating Protective Guard) Level1
• Wight-adjustable full suspension seat
• Seatbelt
• Hydraulic pilot control levers with wrist rests
• Travel levers with foot pedals
• Air conditioning (Type L)
• Cabin heater for defrosting and demising
• Emergency exit hammer
• Front window power assisted with gas damper
• 12 V power source
• 2 speakers and radio aerial
• Location for radio
• Back mirror (left, right and rear)
• Cup holder

• Double-element air filter
• Electric fuel injection pump system
• Auto idling system

• 400 mm rubber track
• 1 x upper track roller
• 5 double-flange track rollers on each track
• 2-speed travel switch on blade lever
• Two-speed travel with auto-shift
• Water separator with drain cock

• Pressure accumulator
• Hydraulic pressure checking ports
• Straight travel circuit
• Third line hydraulic return
• Load-sensing hydraulic system
• Adjustable maximum oil flow on auxiliary circuits (SP1 and SP2) *For (Type L and M)
• Double auxiliary circuit accessories
• Auxiliary switch (SP1) on right control lever
• Auxiliary switch (SP2) on left control lever (Type L and M)
RY9212052GEG0002US0

G-19


• 400 mm steel track (+ 100 kg)
• 550 mm steel track (+ 300 kg)

• Anti-drop valve unit (arm and blade)
• Bracket and harness for beacon light

• Special paint upon request
RY9212007GEG0003US0

RY9212052GEG0003US0





 /
 – /
 – / –

G-20
 


1. Large LCD display
2. Display and anti-theft controllers are unified into 1 ECU.
3. Main display and ECU are independent items connected by
CAN (Controller Area Network) technology.
RY9212007GEG0005US0


The hydraulic control grip has proportional Flow Control built in.
Signals from this sensor activate the proportional solenoid valve to
control the flow rate at the hydraulic service port.
RY9212007GEG0006US0

RY9212007GEG0007US0
(1) GENERAL
*CONTROL ECU
*AUTO IDLE
*ANTI-THEFT
*AUTO SHIFT TRAVELING SPEED
(2) MAIN DISPLAY METER PANAL
 
(1) Control knob (Auxiliary circuit)
(1) Battery cut switch  
 

G-21


All actuators are hydraulically locked when the unlock lever is raised.
(travel, swing, blade and AUX are also hydraulically controlled.)
It realizes smoother movement with fine inching control.

• U55-4 adopts the same 3-pump load sensing system as
KX057-4.
• 1st and 2nd pumps that normally supply the oil to front
attachments change the oil flow to travel actuator when
travelling in order to realize the strong travel performance.
• The travel slow down while operating front attachments is
minimized by adopting 3-pump load sensing system (ex. when
blading and travelling.
RY9212052GEG0004US0
(1) Travel (R), Travel (L)
(2) Boom, Arm, Bucket, AUX1, Swivel
(3) AUX2, Blade, Swing
 
 

G-22
 
Machine specification : Auxiliary port1, Wrist rest, Cab, Japan STD-bucket [125 kg (277 lbs) with 2 pins 7 kg
(15.5 lbs)]



 

• Total length (Transport)
• Total width
• Total height
5330 ± 107 mm
209.8 ± 4.2 in.
1960 ± 20 mm
77.2 ± 0.8 in.
2550 ± 25 mm
100.4 ± 1.0 in.
5500 ± 110 mm
216.5 ± 4.3 in.
1960 ± 20 mm
77.2 ± 0.8 in.
2550 ± 25 mm
100.4 ± 1.0 in.

• Machine weight
(Operating weight)
ROPS
CAB
–
46.8 ± 2 kN
4775 ± 235 kg
10527 ± 517 lbs
–
53.0 ± 3 kN
5400 ± 270 kg
11905 ± 594 lbs
Fuel tank : Full
Truck : Rubber, Japan
STD Bucket [Including
operator's weight 75 kg
(170 lbs)]

• Swivel speed
• Travel speed
• Gradeability
L
R
Rubber F1
Rubber F2
Steel F1
Steel F2
F1
9.0 ± 0.9 rpm
9.0 ± 0.9 rpm
2.8 ± 0.3 km/h
1.74 ± 0.2 mph
4.9 ± 0.5 km/h
3.04 ± 0.3 mph
2.6 ± 0.3 km/h
1.62 ± 0.2 mph
4.6 ± 0.5 km/h
2.86 ± 0.3 mph
30 ° <
9.3 ± 0.9 rpm
9.3 ± 0.9 rpm
2.8 ± 0.3 km/h
1.74 ± 0.2 mph
4.9 ± 0.5 km/h
3.04 ± 0.3 mph
2.6 ± 0.3 km/h
1.62 ± 0.2 mph
4.6 ± 0.5 km/h
2.86 ± 0.3 mph
30 ° <
Front horizontal bucket
crowd with no load
Engine Max. speed
Oil temp. : 50 ± 5 °C
(122 ± 9 °F)
Traveling stance :
Engine Max. speed
Oil temp. : 50 ± 5 °C
(122 ± 9 °F)
Hill-climbing stance,
E/G Max speed
Rear end min. tuming radius 990 ± 20 mm
39.0 ± 0.8 in.
1045 ± 21 mm
41.1 ± 0.8 in.
Swivel frame rear ground clearance 624.5 ± 12.5 mm
24.6 ± 0.5 in.
629 ± 12.6 mm
24.8 ± 0.5 in.
Tumbler center distance 1990 ± 60 mm
78.3 ± 2.4 in.
Crawler total length 2500 ± 75 mm
98.4 ± 3.0 in.
Crawler total width 1960 ± 39 mm
77.2 ± 1.5 in.
Min. ground clearance 310 ± 9 mm
12.2 ± 0.4 in.
Including bottom plate

G-23

• Bucket heaped capacity
• Bucket struck capacity
• Bucket width
• Swing angle
• Max. digging radius
• Ground level Max. digging
radius
• Ground level Min. finish
radius
• Max. digging depth
• Max. vertical digging depth
• Max. digging height
• Max. dump height
SAE, JIS
ROPS L
ROPS R
CAB L
CAB R
ROPS
CAB
ROPS
CAB
0.16 ± 0.006 m3
0.2 ± 0.008 yd3
0.11 ± 0.004 m3
0.1 ± 0.006 yd3
550 ± 11 mm
21.7 ± 0.4 in.
71 ± 2 °
54 ± 2 °
5850 ± 88 mm
230.3 ± 3 in.
5710 ± 86 mm
224.8 ± 3 in.
1975 ± 40 mm
77.8 ± 2 in.
3380 ± 68 mm
133.1 ± 3 in.
2670 ± 80 mm
105.1 ± 3 in.
–
5440 ± 109 mm
214.2 ± 4 in
–
3770 ± 75 mm
148.4 ± 3 in.
0.16 ± 0.006 m3
0.2 ± 0.008 yd3
0.12 ± 0.005 m3
0.2 ± 0.006 yd3
600 ± 12 mm
23.6 ± 0.5 in.
71 ± 2 °
54 ± 2 °
6105 ± 92 mm
240.4 ± 4 in.
5960 ± 89 mm
234.6 ± 4 in.
2045 ± 41 mm
80.5 ± 2 in.
3630 ± 73 mm
142.9 ± 3 in.
2830 ± 85 mm
111.4 ± 3 in.
–
5665 ± 113 mm
223.0 ± 4 in.
–
4005 ± 80 mm
157.7 ± 3 in.
Slope angle : 1×1
Without side cutter
0 ° swing
0 ° swing
0 ° swing
Bucket bottom
horizontal



 

G-24

• Max. dump height
(Arm vertical)
• Min. turning radius
• Min. turning radius
(Left swing)
ROPS
CAB
ROPS
CAB
ROPS
CAB
–
1425 ± 43 mm
56.1 ± 2 in.
–
2390 ± 72 mm
94.1 ± 3 in.
–
1960 ± 59 mm
77.2 ± 2 in.
–
1825 ± 55 mm
71.9 ± 2 in.
–
2460 ± 74 mm
96.9 ± 3 in.
–
2020 ± 61 mm
79.5 ± 2 in.

• Width (STD)
• Height (STD)
• Max. lift above GL (STD)
• Max. below GL (STD)
1960 ± 5 mm
77.2 ± 0.2 in.
408 ± 10 mm
16.1 ± 0.4 in.
440 ± 50 mm
17.3 ± 2 in.
410 ± 50 mm
16.1 ± 2 in.
1960 ± 5 mm
77.2 ± 0.2 in.
408 ± 10 mm
16.1 ± 0.4 in.
440 ± 50 mm
17.3 ± 2 in.
410 ± 50 mm
16.1 ± 2 in.
Bucket tooth slaggish 73 mm >
2.87 in. >
Without shockless
F=30 kgf (66 lbf)
Front boom lateral declination 10 mm >
0.39 in. >
Blade's lateral declination 10 mm >
0.39 in. >
Clearance between bucket crow
and boom cylinder cover
100 ± 19 mm
4.72 ± 0.7 in.
Boom max. height,
Arm crowd
Approach angle STD 30 ± 3 °
Crawler height 523 ± 10 mm
20.59 ± 0.4 in.
Include grouser height
of the crawler
Max. crawler height 555 ± 11 mm
21.85 ± 0.4 in.



 

G-25





 
Max, engine rpm
• no load
• 2 pump relief
(Variable displacement pump)
• Blade + 2 pump relief
(Variable displacement pump)
2400 rpm >
1980 rpm <
(1 pump relief)
–
2400 rpm >
1980 rpm <
1980 rpm <
Arm and bucket Slow
operation to relief,
Oil temp. : 50 ± 5 °C
(122 ± 9 °F)
Blade relief, Arm and
bucket Slow operation
to relief, Oil temp. :
50 ± 5 °C (122 ± 9 °F)
• Idling RPM 1125 ± 75 rpm



 
Travel motor block
performance
L
R
0 mm
0 in.
0 mm
0 in.
0 mm
0 in.
0 mm
0 in.
20 deg. slope, 10 min,
Engine stop
Oil temp. : 50 ± 5 °C
(122 ± 9 °F)
With parking brake
Max, Traction force F1
F2
3426 kgf <
33.6 kN <
7554 lbf <
–
4140 kgf <
40.6 kN <
9127 lbf <
–
Slip 70% theoretical
torque Travel stance,
Oil temp. : 50 ± 5 °C
(122 ± 9 °F)
Data N/A, traveling
speed reduce to low
range.
Travel straightness F1
F2
600 mm >
23.62 in. >
600 mm >
23.62 in. >
600 mm >
23.62 in. >
600 mm >
23.62 in. >
Travel stance, 10 m
(394 in.) distance
Engine Max. speed
Oil temp. : 50 ± 5 °C
(122 ± 9 °F)
Travel straightness Blade F1
Blade R1
600 mm >
23.62 in. >
600 mm >
23.62 in. >
600 mm >
23.62 in. >
600 mm >
23.62 in. >
Travel stance, Blade up
and down 10 m (394 in.)
distance
Engine Max. speed
Oil temp. : 50 ± 5 °C
(122 ± 9 °F)
Track shoe sag distance Steel
Rubber
80 to 85 mm
3.15 to 3.35 in.
10 to 15 mm
0.39 to 0.59 in.
80 to 85 mm
3.15 to 3.35 in.
10 to 15 mm
0.39 to 0.59 in.

G-26




 
Arm digging force 2131 kgf <
20.9 kN <
4699 lbf <
2770 kgf <
23.3 kN <
5238 lbf <
Bucket tooth root
[Arm cylinder length :
1403 mm (55.2 in.)]
Bucket digging force 3192 kgf <
31.3 kN <
7037 lbf <
4315 kgf <
40.2 kN <
9037 lbf <
Bucket tooth root
[Bucket cylinder length
:1098 mm (43.2 in.)]
Blade force Down 3314 kgf <
32.5 kN <
7306 lbf <
3952 kgf <
36.8 kN <
8273 lbf <
Cutting edge down
force at ground level
Boom speed (ROPS)
• Up (Ground to max. up)
• Up (max. down to max. up)
• Down (max. up to Ground)
• Down (max. up to max. down)
–
–
–
–
–
–
–
–
Arm extend.
bucket dump with no
load.
Oil temp. 50 ± 5 °C
(122 ± 9 °F)
exclude cushioning
Boom speed (CAB)
• Up (Ground to max. up)
• Up (max. down to max. up)
• Down (max. up to Ground)
• Down (max. up to max. down)
2.7 ± 0.3 sec.
4.5 ± 0.3 sec.
3.1 ± 0.3 sec.
4.9 ± 0.3 sec.
2.7 ± 0.3 sec.
4.5 ± 0.3 sec.
3.4 ± 0.3 sec.
4.9 ± 0.3 sec.
Arm speed Crowd
Dump
3.2 ± 0.3 sec.
2.8 ± 0.3 sec.
3.2 ± 0.3 sec.
2.8 ± 0.3 sec.
Cylinder full stroke
(122 ± 9 °F)
Bucket speed Crowd
Dump
2.9 ± 0.3 sec.
2.2 ± 0.3 sec.
3.0 ± 0.3 sec.
2.1 ± 0.3 sec.
(122 ± 9 °F)
Blade speed Up
(Ground to
max. up)
Up (max.
down to
max. up)
Down
(max. up to
Ground)
Down(max.
up to max.
down)
1.1 ± 0.3 sec.
2.4 ± 0.3 sec.
1.5 ± 0.3 sec.
2.3 ± 0.3 sec.
1.1 ± 0.3 sec.
2.2 ± 0.3 sec.
1.5 ± 0.3 sec.
2.9 ± 0.3 sec.
(122 ± 9 °F)
Arm cylinder cavitation 5 mm >
0.2 in. >
(122 ± 9 °F)
Engine speed :
1300 rpm
Bucket loaded at
heaped.

G-27
Max. digging height radius ROPS
CAB
–
3285 ± 329 mm
129.3 ± 12.9 in.
–
3430 ± 343 mm
135.0 ± 13.5 in.
Max. dump height radius ROPS
CAB
–
3420 ± 205 mm
134.6 ± 8.1 in.
–
3550 ± 213 mm
139.8 ± 8.4 in.
at bucket pin
Bucket bottom height at arm
vertical
ROPS
CAB
–
1790 ± 54 mm
70.5 ± 2.1 in.
–
1825 ± 55 mm
71.9 ± 2.2 in.
Bucket horizontal Boom
max. height, Arm dump
max.
Bucket wrist angle 184.5 ± 3.0 ° 185.0 ± 3.0 °



 

G-28




 
Swivel torque
L
R
1237 kgf·m <
12.1 kN·m <
8947 lbf·ft <
1237 kgf·m <
12.1 kN·m <
8947 lbf·ft <
1237 kgf·m <
12.1 kN·m <
8947 lbf·ft <
1237 kgf·m <
12.1 kN·m <
8947 lbf·ft <
Arm extend, Quick
operation
Engine Max. speed
Oil temp. : 50 ± 5 °C
(122 ± 9 °F)
Swivel capable slope angle L
R
17 ° <
17 ° <
17 ° <
17 ° <
Front horizontal, Bucket
load heaped [420 kg
(926 lbs) : including
bucket], Engine Max.
speed, Oil temp.:
50 ± 5 °C (122 ± 9 °F)
Swivel block performance
(with negative break)
• Engine stop
• Engine idling
L
R
L
R
5 ° >
5 ° >
30 ° >
30 ° >
5 ° >
5 ° >
30 ° >
30 ° >
Bucket load heaped
[420kg (926 lbs) :
including bucket],
Slope angle at
20 degrees for 1 min.
Engine stop.
Oil temp. : 50 ± 5 °C
(122 ± 9 °F)
Swivel start-up speed L
R
2.8 ± 0.3 sec.
2.8 ± 0.3 sec.
2.8 ± 0.3 sec.
2.8 ± 0.3 sec.
Front horizontal, 90 °
swivel Bucket load
heaped [420 kg
(926 lbs) : including
bucket].
Engine Max. Speed
Oil temp. : 50 ± 5 °C
(122 ± 9 °F)
Swing speed (ROPS) L
R
Front horizontal, bucket
crowd with no load.
Engine Max. speed
Oil temp. : 50 ± 5 °C
(122 ± 9 °F)
Swing speed (CAB) L
R
5.5 ± 0.5 sec.
6.4 ± 0.5 sec.
6.5 ± 0.5 sec.
7.9 ± 0.5 sec.
Swing Lock Swivel
R and L
10 mm >
0.39 in. >
90 ° swivel, 100 times
actual
Bucket load heaped
[420 kg (926 lbs) :
including bucket].
Oil temp. : 50 ± 5 °C
(122 ± 9 °F)

G-29





 
Cylinder oil sealing capacity (Boom)
• 50 ± 5 °C (122 ± 9 °F)
• 95 ± 5 °C (203 ± 9 °F)
20 mm >
0.79 in. >
20 mm >
0.79 in. >
20 mm >
0.79 in. >
20 mm >
0.79 in. >
Arm extend. Bucket
crowd for 10 min.
Bucket load heaped
[420 kg (926 lbs) :
including bucket].
Cylinder oil sealing capacity (Arm)
• 50 ± 5 °C (122 ± 9 °F)
20 mm >
0.79 in. >
Cylinder oil sealing capacity (Bucket)
• 50 ± 5 °C (122 ± 9 °F)
10 mm >
0.39 in. >
Cylinder oil sealing capacity (Blade)
• 50 ± 5 °C (122 ± 9 °F)
20 mm >
0.79 in. >
Arm vertical.
blade cylinder extended
for 10 min. engine stop.
Boom cushioning performance
• 30 °C (86 °F)
• 50 °C (122 °F)
• 80 °C (176 °F)
3 sec. >
0.4 to 1.3 sec.
0.3 sec. <
3 sec. >
0.4 to 1.3 sec.
0.3 sec. <
Arm extended, bucket
crowd with no load.
Engine Max. speed.



 
Boom lever Up
Down
1.2 ± 0.5 kgf
12 ± 5 N
2.7 ± 1.1 lbf
1.4 ± 0.5 kgf
14 ± 5 N
3.1 ± 1.1 lbf
1.2 ± 0.5 kgf
12 ± 5 N
2.7 ± 1.1 lbf
1.4 ± 0.5 kgf
14 ± 5 N
3.1 ± 1.1 lbf
Measuring point :
20 mm (0.79 in.) lower
from the lever top.
Pilot lever with engine
Max. speed.
Arm lever Crowd
Dump
1.2 ± 0.5 kgf
12 ± 5 N
2.7 ± 1.1 lbf
1.4 ± 0.5 kgf
14 ± 5 N
3.1 ± 1.1 lbf
1.2 ± 0.5 kgf
12 ± 5 N
2.7 ± 1.1 lbf
1.4 ± 0.5 kgf
14 ± 5 N
3.1 ± 1.1 lbf
Bucket lever Crowd
Dump
1.0 ± 0.5 kgf
10 ± 5 N
2.2 ± 1.1 lbf
1.0 ± 0.5 kgf
9 ± 5 N
2.0 ± 1.1 lbf
1.0 ± 0.5 kgf
10 ± 5 N
2.2 ± 1.1 lbf
1.0 ± 0.5 kgf
10 ± 5 N
2.2 ± 1.1 lbf
Swivel lever R
L
1.0 ± 0.5 kgf
10 ± 5 N
2.2 ± 1.1 lbf
1.0 ± 0.5 kgf
10 ± 5 N
2.2 ± 1.1 lbf
1.0 ± 0.5 kgf
10 ± 5 N
2.2 ± 1.1 lbf
1.0 ± 0.5 kgf
10 ± 5
2.2 ± 1.1 lbf

G-30
Blade lever Up
Down
1.6 ± 0.5 kgf
16 ± 5 N
3.6 ± 1.1 lbf
1.6 ± 0.5 kgf
16 ± 5 N
3.6 ± 1.1 lbf
1.6 ± 0.5 kgf
16 ± 5 N
3.6 ± 1.1 lbf
1.6 ± 0.5 kgf
16 ± 5 N
3.6 ± 1.1 lbf
Up and down
Measuring point :
from the lever top
Travel lever (L) Forward
Back
1.9 ± 0.5 ± kgf
19 ± 5 N
4.3 ± 1.1 lbf
1.9 ± 0.5 kgf
19 ± 5 N
4.3 ± 1.1 lbf
1.9 ± 0.5 kgf
19 ± 5 N
4.3 ± 1.1 lbf
1.9 ± 0.5 kgf
19 ± 5 N
4.3 ± 1.1 lbf
Measuring point :
from the lever top.
Travel lever (R) Forward
Back
1.9 ± 0.5 kgf
19 ± 5 N
4.3 ± 1.1 lbf
1.9 ± 0.5 kgf
19 ± 5 N
4.3 ± 1.1 lbf
1.9 ± 0.5 kgf
19 ± 5 N
4.3 ± 1.1 lbf
1.9 ± 0.5 kgf
19 ± 5 N
4.3 ± 1.1 lbf
Swing pedal R
L
6.0 ± 1.0 kgf
59 ± 10 N
13.3 ± 2.2 lbf
6.0 ± 1.0 kgf
59 ± 10 N
13.3 ± 2.2 lbf
6.0 ± 1.0 kgf
59 ± 10 N
13.3 ± 2.2 lbf
6.0 ± 1.0 kgf
59 ± 10 N
13.3 ± 2.2 lbf
Pedal edge.
45 ° inward
Safety lock lever (L) Up
Down
2.8 ± 1.0 kgf
27 ± 10 N
6.1 ± 2.2 lbf
7.0 ± 1.0 kgf
69 ± 10 N
15.5 ± 2.2 lbf
2.8 ± 1.0 kgf
27 ± 10 N
6.1 ± 2.2 lbf
7.0 ± 1.0 kgf
69 ± 10 N
15.5 ± 2.2 lbf
Travel Hi-Lo change – – This machine has a
switch.
Boom lever stroke Up
Down
84 ± 10 mm
3.31 ± 0.4 in.
84 ± 10 mm
3.31 ± 0.4 in.
84 ± 10 mm
3.31 ± 0.4 in.
84 ± 10 mm
3.31 ± 0.4 in.
Measuring point :
The lever top.
Max. speed.
Arm lever stroke Crowd
Dump
84 ± 10 mm
3.31 ± 0.4 in.
84 ± 10 mm
3.31 ± 0.4 in.
84 ± 10 mm
3.31 ± 0.4 in.
84 ± 10 mm
3.31 ± 0.4 in.



 

G-31
RY9212052GEG0005US0
Bucket lever stroke Crowd
Dump
74 ± 10 mm
2.91 ± 0.4 in.
74 ± 10 mm
2.91 ± 0.4 in.
74 ± 10 mm
2.91 ± 0.4 in.
74 ± 10 mm
2.91 ± 0.4 in.
Measuring point :
The lever top.
Max. speed.
Bucket lever stroke R
L
74 ± 10 mm
2.91 ± 0.4 in.
74 ± 10 mm
2.91 ± 0.4 in.
74 ± 10 mm
2.91 ± 0.4 in.
74 ± 10 mm
2.91 ± 0.4 in.
Blade lever stroke Up
Down
60 ± 10 mm
2.36 ± 0.4 in.
60 ± 10 mm
2.36 ± 0.4 in.
60 ± 10 mm
2.36 ± 0.4 in.
60 ± 10 mm
2.36 ± 0.4 in.
Measuring point :
The lever top.
Travel lever stroke (L) Forward
Back
100 ± 10 mm
3.94 ± 0.4 in.
100 ± 10 mm
3.94 ± 0.4 in.
100 ± 10 mm
3.94 ± 0.4 in.
100 ± 10 mm
3.94 ± 0.4 in.
Travel lever stroke (R) Forward
Back
100 ± 10 mm
3.94 ± 0.4 in.
100 ± 10 mm
3.94 ± 0.4 in.
100 ± 10 mm
3.94 ± 0.4 in.
100 ± 10 mm
3.94 ± 0.4 in.



 

G-32


 
 
 
RY9212052GEG0006US0
     
(1)
815 mm
32.1 in.
(8)
3770 mm
148.4 in.
4005 mm
157.7 in.
(15)
2500 mm
98.43 in.
(2)
625 mm
24.6 in.
(9)
3380 mm
133.1 in.
3630 mm
142.9 in.
(16)
1820 mm
71.65 in.
(3)
1960 mm
77.2 in.
(10)
2670 mm
105.1 in.
2830 mm
111.4 in.
(17)
5330 mm
209.8 in.
5500 mm
216.5 in.
(4)
990 mm
39.0 in.
1045 mm
44.1 in.
(11)
2390 mm
94.09 in.
2460 mm
96.9 in.
(18)
5710 mm
224.8 in.
5960 mm
234.6 in.
(5)
1830 mm
72.0 in.
(12)
2550 mm
100.4 in.
(19)
5850 mm
230.3 in.
6105 mm
240.4 in.
(6)
1960 mm
77.2 in.
(13)
440 mm
17.3 in.
(7)
5440 mm
214.2 in.
5665 mm
223.0 in.
(14)
410 mm
16.2 in.

G-33
 
RY9212052GEG0007US0
  
Radiator
7.0 L
1.85 U.S.gal
KUBOTA LLC-N-50F 50%
Reserve tank
1.1 L
0.29 U.S.gal
Engine crank case
9.0 L
2.38 U.S.gal
SAE 10W-30 (CF or CI-4)
Hydraulic oil
Full
79 L
20.87 U.S.gal
ISO VG46
Tank
45 L
11.89 U.S.gal
ISO VG46
Travel motor
0.9 L
0.24 U.S.gal
SAE90 (API GL-4)
Track roller
80 ml
4.88 cu.in
SAE30 (CD)
Carrier roller
60 ml
3.66 cu.in
SAE30 (CD)
Front idler
50 ml
3.05 cu.in
SAE30 (CD)
Fuel tank
68 L
18.0 U.S.gal
Diesel Fuel JIS #3 (Initial)

G-34
 
 
 
NOTE : KUBOTA JAPAN BUCKET


G-35

RY9212052GEG0008US0
 
RY9212052GEG0009US0
              
(1)
550 mm
21.65 in.
600 mm
23.62 in.
(8)
83 mm
3.27 in.
(15)
12 mm
0.47 in.
(22)
180 mm
7.09 in.
(29)
80 mm
3.15 in.
(2)
600 mm
23.62 in.
650 mm
25.59 in.
(9)
100 mm
39.4 in.
(16)
743 mm
29.25 in.
(23)
5 mm
0.20 in.
(30)
35 mm
1.38 in.
(3)
247 mm
9.72 in.
(10)
45 mm
1.77 in.
(17)
30 mm
1.18 in.
(24)
16 mm
0.63 in.
(31)
80 mm
3.15 in.
(4)
145 mm
5.71 in.
(11)
45 mm
1.77 in.
(18)
230 mm
9.06 in.
(25)
28.5 mm
1.12 in.
(32)
165 mm
6.50 in.
(5)
65 mm
2.56 in.
(12)
28 mm
1.10 in.
(19)
150 mm
5.91 in.
(26)
156 mm
6.14 in.
173 mm
6.81 in.
(33)
1.5 mm
0.06 in.
(6)
35 mm
1.38 in.
(13) M16 x 1.5 x 2.5 (20)
72 mm
2.83 in.
(27)
78.5 mm
3.09 in.
87 mm
3.41 in.
(34)
165 mm
6.50 in.
(7)
16 mm
0.63 in.
(14)
483 mm
19.02 in.
(21)
98 mm
3.86 in.
(28)
173 mm
6.81 in.
(35)
849 mm
33.43 in.
   
           
(1)
200 mm
7.87 in.
(6)
1343 mm
52.87 in.
1360 mm
53.54 in.
(11)
133 mm
5.24 in.
(16)
145 mm
5.71 in.
(2)
1250 mm
49.21 in.
1370 mm
53.94 in.
(7)
315 mm
12.40 in.
(12)
145 mm
5.71 in.
(17)
61 mm
2.40 in.
(3)
338 mm
13.31 in.
353 mm
13.90 in.
(8)
335 mm
13.19 in.
(13)
45 mm
1.77 in.
(18)
45 mm
1.77 in.
(4)
217 mm
7.60 in.
193 mm
7.60 in.
(9)
10 mm
0.39 in.
(14)
45 mm
1.77 in.
(19)
45 mm
1.77 in.
(5)
350 mm
13.78 in.
335 mm
13.19 in.
(10)
145 mm
5.71 in.
(15)
145 mm
5.71 in.

G-36
 
RY9212052GEG0010US0
 
RY9212052GEG0011US0
 
Identification mark
(Core metal lapping position)
(1) Lug height
19 mm
0.75 in.
(2) Link height
24 mm
0.94 in.
25 mm
0.96 in.
(3) Crawler width
400 mm
15.75 in.
(4) Crawler sag distance
10 to 15 mm
0.39 to 0.59 in.
(5) Crawler height
88.0 mm
3.46 in.
91.0 mm
3.58 in.
Number of core metal 74
Circumference
5365 mm
211.2 in.
Core metal pitch
72.5 mm
2.85 in.
 
Crawler width
400 mm
15.75 in.
550 mm
21.65 in.
(1) 4 links length
540 mm
21.26 in.
(2) Height
67.0 mm
2.64 in.
(3) Bushing O. D.
35.0 mm
1.38 in.
(4) Bushing I. D.
22.5 mm
0.89 in.
(5) Master pin O. D.
22.15 mm
0.87 in.
(6) Grouser height
20.0 mm
0.79 in.
(7) Crawler sag distance
80 to 85 mm
3.15 to 3.35 in.
Number of links 39

G-37
 
RY9212052GEG0012US0
RY9212052GEG0013US0

(1) Guide diameter
85 mm
3.35 in.
(2) Outer diameter
135 mm
5.31 in.
(3) Roller width
200 mm
7.87 in.
(4) Carrier roller diameter
80 mm
3.15 in.
   

(1) Idler O.D.
300 mm
12.99 in.
(2) Guide width
52 mm
2.05 in.
(3) Idler width
93 mm
3.66 in.
(4) Sprocket wheel O.D.
429 mm
16.89 in.
(5) Sprocket wheel width
43 mm
1.69 in.
   

G-38
 

RY9212052GEG0014US0
        


Boom
U48-4
50 mm
1.97 in.
50 mm
1.97 in.
70 mm
2.76 in.
70 mm
2.76 in.
50 mm
1.97 in.
90 mm
3.54 in.
108 mm
4.25 in.
49 mm
1.03 in.
50 mm
1.97 in.
PF 1/2"
U55-4
55 mm
2.17 in.
55 mm
2.17 in.
70 mm
2.76 in.
70 mm
2.76 in.
55 mm
2.17 in.
95 mm
3.74 in.
117 mm
4.61 in.
55 mm
2.17 in.
50 mm
1.97 in.
PF 1/2"
Arm
U48-4
45 mm
1.77 in.
45 mm
1.77 in.
70 mm
2.76 in.
70 mm
2.76 in.
50 mm
1.97 in.
80 mm
3.15 in.
96 mm
3.78 in.
49 mm
1.03 in.
50 mm
1.97 in.
PF 1/2"
U55-4
50 mm
1.97 in.
50 mm
1.97 in.
70 mm
2.76 in.
70 mm
2.76 in.
55 mm
2.17 in.
85 mm
3.35 in.
105 mm
4.13 in.
55 mm
2.17 in.
50 mm
1.97 in.
PF 1/2"
Bucket
U48-4
45 mm
1.77 in.
45 mm
1.77 in.
60 mm
2.36 in.
60 mm
2.36 in.
40 mm
1.57 in.
70 mm
2.76 in.
85 mm
3.35 in.
42 mm
1.65 in.
39 mm
1.54 in.
PF 1/2"
U55-4
45 mm
1.77 in.
45 mm
1.77 in.
60 mm
2.36 in.
60 mm
2.36 in.
45 mm
1.77 in.
75 mm
2.95 in.
91 mm
3.58 in.
40 mm
1.57 in.
40 mm
1.57 in.
PF 1/2"
Swing
U48-4
45 mm
1.77 in.
45 mm
1.77 in.
60 mm
2.36 in.
60 mm
2.36 in.
45 mm
1.77 in.
85 mm
3.35 in.
102 mm
4.02 in.
49 mm
1.03 in.
50 mm
1.97 in.
G 1/4"
U55-4
45 mm
1.77 in.
45 mm
1.77 in.
60 mm
2.36 in.
60 mm
2.36 in.
50 mm
1.97 in.
90 mm
3.54 in.
107 mm
4.21 in.
49 mm
1.03 in.
50 mm
1.97 in.
G 1/4"
Blade
U48-4
55 mm
2.17 in.
55 mm
2.17 in.
70 mm
2.76 in.
70 mm
2.76 in.
55 mm
2.17 in.
95 mm
3.74 in.
114 mm
4.49 in.
55 mm
2.17 in.
55 mm
2.17 in.
G 3/8"
U55-4
55 mm
2.17 in.
55 mm
2.17 in.
70 mm
2.76 in.
70 mm
2.76 in.
60 mm
2.36 in.
110 mm
4.33 in.
131 mm
5.16 in.
55 mm
2.17 in.
56 mm
2.20 in.
G 3/8"

G-39
 
  
Track frame
566 kg
1248 lbs
615 kg
1355.8 lbs
Swivel frame
543 kg
1197 lbs
585 kg
1290 lbs
Swing bracket
112.0 kg
246.9 lbs
121.0 kg
266.8 lbs
Boom
172.0 kg
379.2 lbs
208.0 kg
458.6 lbs
Arm (STD)
92 kg
203 lbs
102 kg
224.9 lbs
Bucket
107.0 kg
235.9 lbs
110.0 kg
244.7 lbs
Without teeth and side cutter
Blade
241.0 kg
531.3 lbs
Weight (rear)
287.0 kg
632.7 lbs
698 kg
1539 lbs
Rubber crawler
265.0 kg
584.2 lbs
240.0 kg
529.1 lbs
Steel crawler (STD.)
285.0 kg
628.3 lbs
Steel crawler (wide) –
385.0 kg
848.8 lbs
Arch frame
51.0 kg
112.4 lbs
Engine
225.0 kg
496.0 lbs
Dry weight
Hydraulic tank
38.0 kg
83.8 lbs
With filter
Fuel tank
4.2 kg
9.3 lbs
Swivel bearing
62.0 kg
137.0 lbs
68.6 kg
151.2 lbs
Battery
22.7 kg
49.9 lbs
Track roller
9.4 kg
20.7 lbs
Upper roller
3.3 kg
7.2 lbs
ROPS/FOPS cabin
225.0 kg
496.0 lbs
Hydraulic pump
34.0 kg
75.0 lbs
42.0 kg
92.6 lbs
Traveling motor
59.0 kg
130.0 lbs
58.0 kg
127.9 lbs
Swivel motor
50.0 kg
110.2 lbs
Sprocket
15.3 kg
33.8 lbs
Idler ass'y
46.4 kg
102.3 lbs
Control valve
59.5 kg
131.2 lbs
Without adaptors
Boom cylinder
48.0 kg
106.0 lbs
60.0 kg
132.3 lbs
Arm cylinder
45.0 kg
99.2 lbs
56.0 kg
123.5 lbs

G-40
The above weight list is based on calculation and slightly different from actual ones.
RY9212052GEG0015US0
Bucket cylinder
26.0 kg
57.3 lbs
32.0 kg
70.5 lbs
Swing cylinder
37.3 kg
82.2 lbs
Blade cylinder
28.6 kg
63.1 lbs
36.5 kg
80.5 lbs
Rotary joint
27.7 kg
61.1 lbs
  

G-41
 

*1 : Under very dusty conditions, the air filter and the interior air filter must be cleaned more frequently or replaced.




                   
Check the fuel level daily
Check the coolant level daily
Checking the engine oil level daily
Check the hydraulic oil level daily
Grease the bucket bolt and
bucket linkage bolt
daily
Check the V-belt daily
Check the fluid level of the
washer system reservoir
daily
Check the electric cables and
connections
daily
Clean the radiator and
condenser
daily
Lubricate the front-end
attachments :
Grease the swing bracket
Other greasing points
daily
Check the water separator 50 h
Drain water from the fuel tank 50 h
Check the battery electrolyte
level
50 h
Crawlers and track frame:
Clean, visually inspect and check
tension
50 h
Grease the swivel gear 50 h
Grease the pitch bearing 200 h
*1
Check and clean the interior air
filter
200 h
*1 Check, clean the air filter 200 h
Check the coolant hoses and
hose clamps
200 h
Check the fuel lines and air
intake hoses
200 h
Check the pipes and hoses of
the air conditioner
annually

G-42

The servicing identified with must be carried after the specified hours of operation after initial operation have been reached.
*1 : Under very dusty conditions, the air filter and the interior air filter must be cleaned more frequently or replaced.
*2 : When using a hydraulic hammer over 20 % every 800 h.
When using a hydraulic hammer over 40 % every 400 h.
*3 : Please contact your KUBOTA dealer.
*4 : Earlier if necessary.
*5 : At least annually.
RY9212032GEG0005US0




                   
Check the coolant hoses and
hose clamps
250 h
*3
Replace the coolant hoses and
hose clamps
every
2 years
*3
Replace the fuel lines and air
intake hoses
every
2 years
Check and adjust the V-belt 250 h
Change the engine oil and oil
filter
500 h
*4 Replace the drive unit oil 500 h
Replace the fuel filter 500 h
Replace the tank breather filter 500 h
*2 Replace the return filter 1000 h
Replace the pilot circuit filter 1000 h
*2
Change the hydraulic oil and
replace the suction filter
1000 h
*1 Replace the air filter elements 1000 h
*1 Replace the interior air filter 1000 h
*3
Change the oil of the idler and
track roller
2000 h
*3
Check alternator and starter
motor
2000 h
*3
Replace the pipes and hoses of
the air conditioner
every
2 years
Replace the coolant
every
2 years
*3 Change the hydraulic hoses
every
6 years
Check the coolant content
mainte-
nance on
demand
*5 Safety inspection annually

 


1. FRONT OPERATING MACHINE.................................................................................................1-S1
[1] BLADE...................................................................................................................................1-S1
(1) Blade dimension..............................................................................................................1-S1
[2] FRONT PIN ...........................................................................................................................1-S2
2. SWIVEL FRAME..........................................................................................................................1-S3
[1] WEIGHT DIASSEMBLY / ASSEMBLY..................................................................................1-S3
[2] FUEL TANK...........................................................................................................................1-S5
[3] HYDRAULIC OIL TANK ........................................................................................................1-S8
(1) Hydraulic oil tank components.........................................................................................1-S8
(2) Hydraulic oil return filter replacement procedure.............................................................1-S9
(3) Filter (suction) replacement procedure..........................................................................1-S10
(4) Filter (breather) replacement procedure........................................................................1-S11
(5) Assembly of anti vibration support for the hydraulic oil tank..........................................1-S12
[4] ENGINE...............................................................................................................................1-S13
(1) Engine mount ................................................................................................................1-S13
(2) Muffler............................................................................................................................1-S14
(3) Arch, Air cleaner............................................................................................................1-S15
(4) Radiator.........................................................................................................................1-S16
(5) Oil cooler .......................................................................................................................1-S17
(6) Accelerator cable...........................................................................................................1-S18
[5] ASSEMBLING OF OPERATING LEVERS..........................................................................1-S19
(1) Travel lever....................................................................................................................1-S19
(2) Blade lever.....................................................................................................................1-S20
3. TRACK FRAME.........................................................................................................................1-S21
[1] ASSEMBLING OF SWIVEL BEARING ...............................................................................1-S21
[2] TRACK ................................................................................................................................1-S23
(1) Assembly / disassembly of rubber track........................................................................1-S23
(2) Assembly / disassembly of iron tracks...........................................................................1-S24
[3] FRONT IDLER.....................................................................................................................1-S27
(1) Assembly / disassembly of front idler ............................................................................1-S27
(2) Front idler structural components..................................................................................1-S27
[4] SPRING ASSY ....................................................................................................................1-S28
(1) Assembly / disassembly of spring assy.........................................................................1-S28
[5] CYLINDER ASSEMBLY ......................................................................................................1-S29
(1) Assembly / disassembly of cylinder assy ......................................................................1-S29
(2) Cylinder assembly structural components.....................................................................1-S29
[6] TRACK ROLLER .................................................................................................................1-S31
(1) Assembly / disassembly of track roller ..........................................................................1-S31
(2) Track roller structural components ................................................................................1-S32
[7] CARRIER ROLLER .............................................................................................................1-S33
(1) Assembly / disassembly of carrier roller........................................................................1-S33
(2) Carrier roller structural components ..............................................................................1-S34


MACHINE BODYU48-4,U55-4, WSM
1-S1
 
 
 
RY9212050MBS0014US0

 Pin diameter x length 55 x 65 mm ( 2.2 x 2.6 in.)
 Pin diameter x length 55 x 25 mm ( 2.2 x 1 in.)
 Blade width 1960 mm (77.2 in.)
 Blade height 408 mm (16.1 in.)
 Blade length 1365 mm (53.7 in.)

Blade tip plate height
x thickness
65 x t12 mm (2.6 x t0.5 in.)

Length between
blade arms
599 mm (23.6 in.)

1-S2
 

 

RY9212007GEG0012US0
 
(1) Pin diameter x length
mm
in.
92 x 176
3.62 x 6.93
mm
in.
92 x 150
3.62 x 5.91
mm
in.
45 x 158
1.77 x 6.22
mm
in.
45 x 131
1.77 x 5.16
mm
in.
55 x 347
2.17 x 13.66
mm
in.
55 x 165
2.17 x 6.50
mm
in.
55 x 196
2.17 x 7.72
mm
in.
55 x 235
2.17 x 9.25
mm
in.
50 x 196
1.97 x 7.72
mm
in.
50 x 152
1.97 x 5.98
mm
in.
45 x 257
1.77 x 10.12
mm
in.
45 x 257
1.77 x 10.12
mm
in.
45 x 152
1.17 x 5.98
mm
in.
45 x 204
1.77 x 8.03
mm
in.
45 x 204
1.77 x 8.03
mm
in.
45 x 142
1.77 x 5.59
mm
in.
55 x 154
2.17 x 6.06
   

1-S3
 
 

1. Open the bonnet (right) (4), remove the two snap pins (1), (2),
and separate the gas damper from the bonnet.
2. Slide the bonnet (right) (4) to the front of the body and remove it.

       

• Bonnet (right) weight : 27 kg (60 lbs)
RY9212032MBS0009US0

1. Remove five mounting bolts (2), (3) of the bonnet (left) (4) and
remove the bonnet (left) (4).
RY9212052MBS0011US0

1. Remove the bolt (1), pull out the pin (2), and remove the bonnet
(rear) (3).
2. Remove the mounting bracket (4) and four mounting bolts (5) of
the bonnet (rear) and remove the bracket (4).
RY9212052MBS0012US0
(1) Snap pin, flat washer
(2) Snap pin, flat washer
(3) Gas damper
(4) Bonnet (right)
(1) Cap, assy
(2) Bolt (M10 x 35)
(3) Bolt (M10 x 25)
(4) Bonnet (rear)
(1) Bolt (M8 x 16)
(2) Pin
(3) Bonnet (rear)
(4) Bracket
(5) Bolt (M10 x 20)

1-S4

1. Attach two eyebolts (2) to the weight (1), connect a nylon sling
(4) to these and support the weight using a crane.
2. Remove the three mounting bolts (3) of the weight, lift slightly
with the crane, slide the weight to the rear, lift the weight and
remove it from the frame.
Apply thread locking compound (Loctite 271)
• Weight of the weight :
290 kg, 639 lbs (U48-4)
700 kg, 1540 lbs (U55-4)

 


RY9212052MBS0001US0
RY9212050MBS0008US0
Tightening torque Weight (1)
367.7 to 431.5 N·m
37.5 to 44.0 kgf·m
271.2 to 318.3 lbf·ft
(1) Weight
(2) Eyebolt (M24 × P3)
(3) Bolt (M20×90)
(4) Nylon sling
 
 
(1) Weight (3) Bolt (M20×90)

1-S5
 

RY9212050MBS0001US0

RY9212050MBS0002US0
(1) Fuel tank assembly
(2) Band, assy (fuel tank)
(3) Lock nut
(4) Flat metal washer
(5) Plate, assy
(1, fuel tank support)
(6) Bolt (M10 x 20)
(8) Plate, assy
(2, fuel tank support)
(9) Bolt (M10 x 25)
 


 
(1) Fuel tank assembly (2) Bolt (M10 x 25)    




1-S6

RY9212032MBS0014US0
(1) Guide
(2) Clamp
(3) Clamp

1-S7


RY9212052MBS0008US0
(1) Drain cock
(2) Fuel tank
(3) Water separator
(4) Fuel pump
(5) Fuel filter
(6) Engine
(7) Fuel cooler
  
    
 RD451-51332 730 mm, 28.7 in. RD451-51341 610 mm, 24 in. 09318-88130
 09664-82100 2100 mm, 82.7 in, RC301-51151 2000 mm, 78.7 in. 14911-42751
 09664-80340 340 mm, 13.4 in. RD451-51352 260 mm, 10.2 in. 14911-42751
 09664-80260 260 mm, 10.2 in. RD451-51382 200 mm, 7.9 in. 14911-42751
 09664-80260 260 mm, 10.2 in. RD451-51382 200 mm, 7.9 in. 14911-42751
 09664-40500 500 mm, 19.7 in. RC461-51641 450 mm, 17.7 in. 14971-42751
 09664-41750 1750 mm, 68.9 in. RD451-51392 1650 mm, 65 in. 14971-42751
 09664-80040 40 mm, 1.6 in. – – 14911-42751
 09664-80040 40 mm, 1.6 in. – – 14911-42751
 09664-42100 2100 mm, 82.7 in, RB441-51221 2000 mm, 78.7 in, 14971-42751
 09664-60420 420 mm, 16.5 in. – – –

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KUBOTA U48-4 EXCAVATOR Service Repair Manual