caterpillar heui system

7/28/2019 caterpillar HEUI system

http://slidepdf.com/reader/full/caterpillar-heui-system 1/24

1Malaga 

3408/12 & 3126 B H E U I

7/28/2019 caterpillar HEUI system

http://slidepdf.com/reader/full/caterpillar-heui-system 2/24

2Malaga 

Components High pressurehydraulic pump 

E C M 

Throttlecontrol 

Speed/timingsensor 

Injector Pressuresensor 

Temperaturesensor 

3408/12 H E U I

7/28/2019 caterpillar HEUI system

http://slidepdf.com/reader/full/caterpillar-heui-system 3/24

3Malaga 

Oil flow 

IAPsensor 

3408/12 H E U I

7/28/2019 caterpillar HEUI system

http://slidepdf.com/reader/full/caterpillar-heui-system 4/24

4Malaga 

HEUI System 

3408/12 H E U I

TO LUBESYSTEM

FUEL

TRANSFER

PUMP

PUMP

CONTROL

VALVE

OIL

FILTER

OIL

COOLER

HEUI

HEUI

OIL

SUMP

HYDRAULIC

PRESSURE

SENSOR

HYDRAULIC

TEMPERATURE

SENSOR

OIL PRESSURE

SENSOR

ECM

COOL DOWN

CIRCUIT

FUEL TANK

FUEL

TEMPERATURE

SENSOR

PRESSURE

REGULATING

VALVE

SECONDARY

FUEL

FILTER

PRIMARY

FUEL FILTER

WATER

SEPARATOR

LUBE OIL

PUMP

COLD START

OIL

RESERVOIR

HYDRAULIC

SUPPLY

PUMP

GROUP

FLUID MANIFOLD

HYDRAULIC PASSAGE

FLUID MANIFOLD

HYDRAULIC PASSAGE

7/28/2019 caterpillar HEUI system

http://slidepdf.com/reader/full/caterpillar-heui-system 5/24

5Malaga 

Injector components 3408/12 H E U I

Valve body 

Barrel 

Nozzle 

7/28/2019 caterpillar HEUI system

http://slidepdf.com/reader/full/caterpillar-heui-system 6/24

6Malaga 

Poppet action 3408/12 H E U I

Poppet closed  From ECM 

Drain cycle From ECM Poppet open 

7/28/2019 caterpillar HEUI system

http://slidepdf.com/reader/full/caterpillar-heui-system 7/247Malaga 

Injector check valves 

Reverse flow check valve 

Venting check valve Inlet check valve 

3408/12 H E U I

7/28/2019 caterpillar HEUI system

http://slidepdf.com/reader/full/caterpillar-heui-system 8/248Malaga 

Metering ( Prime) 3408/12 H E U I

7/28/2019 caterpillar HEUI system

http://slidepdf.com/reader/full/caterpillar-heui-system 9/249Malaga 

Timing wheel 3408/12 H E U I

7/28/2019 caterpillar HEUI system

http://slidepdf.com/reader/full/caterpillar-heui-system 10/24

7/28/2019 caterpillar HEUI system

http://slidepdf.com/reader/full/caterpillar-heui-system 11/2411Malaga 

3 valve cylinder head 3126B H E U I

7/28/2019 caterpillar HEUI system

http://slidepdf.com/reader/full/caterpillar-heui-system 12/2412Malaga 

Oil passage 3126B H E U I

E

7/28/2019 caterpillar HEUI system

http://slidepdf.com/reader/full/caterpillar-heui-system 13/2413Malaga 

Injector sleeve

3126 B H E U I

1 6 B H E

7/28/2019 caterpillar HEUI system

http://slidepdf.com/reader/full/caterpillar-heui-system 14/2414Malaga 

Component diagram 3126 B H E U I

3126 B H E U

7/28/2019 caterpillar HEUI system

http://slidepdf.com/reader/full/caterpillar-heui-system 15/24

15Malaga 

Low fuel pressure 3126 B H E U I

3126 B H E U I

7/28/2019 caterpillar HEUI system

http://slidepdf.com/reader/full/caterpillar-heui-system 16/24

16Malaga 

Injection Actuation Pressure Control Valve(IAPCV) 

The IAPCV controls the

HEUI oil pressure 

3126 B H E U I

3126 B H E U I

7/28/2019 caterpillar HEUI system

http://slidepdf.com/reader/full/caterpillar-heui-system 17/24

17Malaga 

Injector

Component 

3126 B H E U I

3126 B H E U I

7/28/2019 caterpillar HEUI system

http://slidepdf.com/reader/full/caterpillar-heui-system 18/24

18Malaga 

Solenoid 3126 B H E U I

3126 B H E U I

7/28/2019 caterpillar HEUI system

http://slidepdf.com/reader/full/caterpillar-heui-system 19/24

19Malaga 

Poppet Valve

closed 

3126 B H E U I

3126 B H E U I

7/28/2019 caterpillar HEUI system

http://slidepdf.com/reader/full/caterpillar-heui-system 20/24

20Malaga 

Poppet valve

open 

3126 B H E U I

3126 B H E U I

7/28/2019 caterpillar HEUI system

http://slidepdf.com/reader/full/caterpillar-heui-system 21/24

21Malaga 

Intensifier

piston

and

plunger 

3126 B H E U I

3126 B H E U I

7/28/2019 caterpillar HEUI system

http://slidepdf.com/reader/full/caterpillar-heui-system 22/24

22Malaga 

Nozzle

assembly 

3126 B H E U I

H E U I

7/28/2019 caterpillar HEUI system

http://slidepdf.com/reader/full/caterpillar-heui-system 23/24

23Malaga 

H E U I

Vertical bolts

Injector clamp

Horizontal bolts

Injector installation

Allen screws

H E U I

7/28/2019 caterpillar HEUI system

http://slidepdf.com/reader/full/caterpillar-heui-system 24/24

24Malaga

H E U I