C7 engines - fuel system

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525C Wheel Skidder 52500001-UP (MACHINE) POWERED BY C-7 Engine(SEBP4577 - 39) - Sy... Page 1 of 28
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Product: WHEEL SKIDDER Model: 525C WHEEL SKIDDER 525 Configuration: 525C Wheel Skidder 52500001-UP (MACHINE) POWERED BY C-7 Engine

Systems Operation
C7 Engines for Caterpillar Built Machines
Media Number -SENR9939-20 Publication Date -01/12/2010 Date Updated-21/12/2010

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Fuel System
SMCS - 1250

Illustration 1

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525C Wheel Skidder 52500001-UP (MACHINE) POWERED BY C-7 Engine(SEBP4577 - 39) - Sy... Page 2 of 28
Typical example (1) Oil pump (2) Hydraulic electronic unit injectors (3) Oil filter (4) Oil cooler (5) High pressure oil (6) Low pressure fuel line (7) Connector for the Injection Actuation Pressure Control Valve(IAPCV) (8) Unit injector hydraulic pump (9) Sensor for the Injection Actuation Pressure (IAP) (10) Fuel filter (11) Primary fuel filter and water separator (12) Fuel tank (13) Camshaft gear (14) Speed/Timing sensors (15) Electronic Control Module (ECM) (16) Battery (17) Fuel pressure regulator (18) Inlet manifold pressure sensor (19) Oil pressure sensor (20) Coolant temperature sensor (21) Inletair temperature sensor (22) Atmospheric pressure sensor (23) Air inlet heater

Introduction
The operation of the Hydraulic Electronic Unit Injector fuel system is completely different from any other fuel system that is actuated mechanically. The HEUI fuel system is completely free of adjustment. Adjustments to the components that are mechanical can not be made. Changes in performance are made byinstalling different software in the Electronic Control Module (ECM).

525C Wheel Skidder 52500001-UP (MACHINE) POWERED BY C-7 Engine(SEBP4577 - 39) - Sy... Page 3 of 28 This fuel system consists of four basic components: HEUI ECM Unit injector hydraulic pump Fuel transfer pump Note: The fuel transfer pump is a serviceable part. The internal components of the HEUI fuel system are notserviceable. These fuel system components must not be disassembled. Disassembly will damage the components. If the components have been disassembled, Caterpillar may not allow a warranty claim or Caterpillar may reduce the warranty claim.

Component Description
Hydraulic Electronic Unit Injector

Illustration 2

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The fuel system utilizes a hydraulically actuated electronically controlledunit injector.

525C Wheel Skidder 52500001-UP (MACHINE) POWERED BY C-7 Engine(SEBP4577 - 39) - Sy... Page 4 of 28 All fuel systems for diesel engines use a plunger and barrel in order to pump fuel under high pressure into the combustion chamber. The HEUI uses engine oil under high pressure in order to power the plunger. The HEUI uses engine lubrication oil that is pressurized from 6 MPa (875psi) to 28 MPa (4050 psi) in order to pump fuel from the injector. The high pressure oil is called the injection actuation pressure. The HEUI operates in the same way as a hydraulic cylinder in order to multiply the force of the high pressure oil. This multiplication of pressure is achieved by applying the force of the high pressure oil to a piston. The piston is larger than the plunger byapproximately six times. The piston that is powered by engine lubrication oil under high pressure pushes on the plunger. The actuation pressure of the oil generates the injection pressure that is delivered by the unit injector. Injection pressure is greater than actuation pressure of the oil by approximately six times. Low actuation pressure of the oil results in low injection pressure of the fuel. Highactuation pressure of the oil results in high injection pressure of the fuel.

ECM
The ECM is located on the left side of the engine. The ECM is a powerful computer that provides total electronic control of engine performance. The ECM uses data from engine performance that is gathered by several sensors. The ECM uses this data in order to make adjustments to the fuel delivery, injection...
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