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caterpillar-heui-system.pdf
1. 7/28/2019 caterpillar HEUI system
http://slidepdf.com/reader/full/caterpillar-heui-system 1/24
1
Malaga
3408/12 & 3126 B H E U I
2. 7/28/2019 caterpillar HEUI system
http://slidepdf.com/reader/full/caterpillar-heui-system 2/24
2
Malaga
Components
High pressure
hydraulic pump
E C M
Throttle
control
Speed/timing
sensor
Injector
Pressure
sensor
Temperature
sensor
3408/12 H E U I
3. 7/28/2019 caterpillar HEUI system
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3
Malaga
Oil flow
IAP
sensor
3408/12 H E U I
4. 7/28/2019 caterpillar HEUI system
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4
Malaga
HEUI System
3408/12 H E U I
TO LUBE
SYSTEM
FUEL
TRANSFER
PUMP
PUMP
CONTROL
VALVE
OI
L
FILTER
OI
L
COOLER
HEUI
HEUI
OIL
SUMP
HYDRAULIC
PRESSURE
SENSOR
HYDRAULIC
TEMPERATURE
SENSOR
OIL PRESSURE
SENSOR
ECM
COOL DOWN
CIRCUIT
FUEL TA
NK
FUEL
TEMPERAT
URE
SENSOR
PRESSURE
REGULATING
VALVE
SECONDARY
FUEL
FILTER
PRIMARY
FUEL FILT
ER
WATER
SEPARATOR
LUBE OIL
PUMP
COLD STA
RT
OI
L
RESERVOIR
HYDRAULIC
SUPPLY
PUMP
GROUP
FLUID MANIFOLD
HYDRAULIC PASSAGE
FLUID MANIFOLD
HYDRAULIC PASSAGE
5. 7/28/2019 caterpillar HEUI system
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5
Malaga
Injector components
3408/12 H E U I
Valve body
Barrel
Nozzle
6. 7/28/2019 caterpillar HEUI system
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6
Malaga
Poppet action
3408/12 H E U I
Poppet closed From ECM
Drain cycle
From ECM
Poppet open
7. 7/28/2019 caterpillar HEUI system
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7
Malaga
Injector check valves
Reverse flow check valve
Venting check valve
Inlet check valve
3408/12 H E U I
8. 7/28/2019 caterpillar HEUI system
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8
Malaga
Metering ( Prime)
3408/12 H E U I
9. 7/28/2019 caterpillar HEUI system
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9
Malaga
Timing wheel
3408/12 H E U I
11. 7/28/2019 caterpillar HEUI system
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11
Malaga
3 valve cylinder head
3126B H E U I
12. 7/28/2019 caterpillar HEUI system
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12
Malaga
Oil passage
3126B H E U I
13. 7/28/2019 caterpillar HEUI system
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13
Malaga
Injector sleeve
3126 B H E U I
14. 7/28/2019 caterpillar HEUI system
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14
Malaga
Component diagram
3126 B H E U I
15. 7/28/2019 caterpillar HEUI system
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15
Malaga
Low fuel pressure
3126 B H E U I
16. 7/28/2019 caterpillar HEUI system
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16
Malaga
Injection Actuation Pressure Control Valve
(IAPCV)
The IAPCV controls the
HEUIoil pressure
3126 B H E U I
17. 7/28/2019 caterpillar HEUI system
http://slidepdf.com/reader/full/caterpillar-heui-system 17/24
17
Malaga
Injector
Component
3126 B H E U I
18. 7/28/2019 caterpillar HEUI system
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18
Malaga
Solenoid
3126 B H E U I
19. 7/28/2019 caterpillar HEUI system
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19
Malaga
Poppet Valve
closed
3126 B H E U I
20. 7/28/2019 caterpillar HEUI system
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20
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Poppet valve
open
3126 B H E U I
21. 7/28/2019 caterpillar HEUI system
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21
Malaga
Intensifier
piston
and
plunger
3126 B H E U I
22. 7/28/2019 caterpillar HEUI system
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22
Malaga
Nozzle
assembly
3126 B H E U I
23. 7/28/2019 caterpillar HEUI system
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23
Malaga
H E U I
Vertical bolts
Injector clamp
Horizontal bolts
Injector installation
Allen screws
24. 7/28/2019 caterpillar HEUI system
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24
Malaga
H E U I
