Download Common Rail PDF

TitleCommon Rail
TagsPump Engines Turbocharger Fuel Injection Turbine
File Size2.2 MB
Total Pages109
Table of Contents
                            COVER
TABLE OF CONTENTS
NOTES
INTRODUCTION
	C4.4/C6.6 ACERT™ Engines
	C4.2/C6.4 ACERT™ Engines
MAINTENANCE
	Safety
	Fuel System
	General Service Procedures
	Maintenance Intervals
COMMON RAIL FUEL SYSTEM
	Low Pressure Fuel Circuit
	High Pressure Fuel Circuit
C4.4/C6.6 ENGINE COMPONENTS AND OPERATION
	Fuel System
	Air Inlet System
	Electrical System
	Demand Fan
	Reversing Fan
C4.2/C6.4 ENGINE COMPONENTS AND OPERATION
	Fuel System
	Air Inlet System
	Electrical System
ENGINE DIAGNOSTICS
	Caterpillar Electronic Technician (Cat ET)
	Monitoring Systems
CONCLUSION
VISUAL LIST
HYDRAULIC SCHEMATIC COLOR CODE
HAND OUTS
                        
Document Text Contents
Page 1

SERV1837-01
June 2008

TECHNICAL PRESENTATION

C4.2/C6.4 AND C4.4/C6.6 ACERT™
ENGINES

WITH COMMON RAIL FUEL SYSTEM
MACHINE APPLICATIONS

Service Training Meeting Guide
(STMG)

GLOBAL SERVICE LEARNING

Page 54

The wiring harness and its connectors are serviceable. All harness connectors can be replaced
separately except the pump solenoid connector. The pump solenoid connector is serviced as a
"pigtail" connector. The injector harnesses (not shown) below the valve cover are serviced
separately.

When working on the harness, always secure the harness in the original position with the correct
clips and away from pinch points, heat, and sharp edges.

The connectors are keyed to fit in only one direction, which ensures proper pin to socket
alignment. Never force connectors, as they should fit together with minimal effort.

Connectors are designed to seal out dirt and moisture without the use of electrical grease. When
servicing the harness, inspect the condition of the seals on the connectors. When pins are
unused, be sure to use blanking plugs to protect the connector against dirt and moisture.

Two general purpose connector kits are available for servicing DT and AMPSeal connectors.

The ECM connector 0.75 mm (0.030 in.) pins are available as service parts. The pins are
replaced using a Deutsch service tool.

38

SERV1837-01 - 54 - Text Reference
06/08

Page 55

39

Demand Fan

This illustration shows the hydraulic demand fan system in the D6K Track-type Tractor. The
hydraulic demand fan system is installed on some machine applications with the C4.4 or C6.6
engines.

In machine applications equipped with the hydraulic demand fan system, the Machine ECM and
Engine ECM work together via the Cat Data Link to determine the appropriate fan speed for
proper system cooling. The Engine ECM monitors coolant temperature and air inlet temperature
while the Machine ECM monitors hydraulic oil temperature.

Based on system monitoring input, the Machine ECM sends the appropriate signal to the fan
solenoid valve in the demand fan control manifold. The demand fan solenoid valve provides the
proper fan speed for the cooling system. The solenoid valve decreases fan speed using the flow
control valve by rerouting some of the supply oil to the oil cooler instead of the fan. Maximum
fan speed occurs when the fan solenoid valve is de-energized and all of the pump flow is
directed through the fan motor for increased cooling.

The return oil from the fan motor is directed through the oil cooler and filter to the tank. Both
the cooler and the filter are equipped with bypass valves.

SERV1837-01 - 55 - Text Reference
06/08

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