Komatsu PC300-7E0, PC300LC-7EO, PC350-7E0, PC350LC-7E0 Excavator Manual

Table of Contents

01 GENERAL ……………………………………………………………… 01-1
10 STRUCTURE AND FUNCTION ……………………………….. 10-1
20 TESTING AND ADJUSTING…………………………………… 20-1
30 DISASSEMBLY AND ASSEMBLY …………………………… 30-1
90 OTHERS………………………………………………………………… 90-1

1. Composition of shop manual

This shop manual contains the necessary technical information for services performed in a workshop. For
ease of understanding, the manual is divided into the following sections.

00. FOREWORD
This section explains the safety and basic information.

01. GENERAL
This section explains the specifications of the machine for the Excavator.

10. STRUCTURE AND FUNCTION, MAINTENANCE STANDARD
This section explains the structure, function, and maintenance standard values of each component.
The structure and function sub-section explains the structure and function of each component. It serves not only to give an understanding of the structure, but also serves as reference material for troubleshooting. The maintenance standard sub-section explains the criteria and remedies for disassembly and service.

20. TESTING AND ADJUSTING
Standard value table
This section explains the standard values for new machine and judgement criteria for testing, adjusting, and troubleshooting. This standard value table is used to check the standard values in testing and adjusting and to judge parts in troubleshooting.

Testing and adjusting
This section explains measuring instruments and measuring methods for testing and adjusting, and method of adjusting each part. The standard values and judgement criteria for testing and adjusting are explained in Testing and adjusting.

Troubleshooting
This section explains how to find out failed parts and how to repair them. The troubleshooting is divided by failure modes. The S mode of the troubleshooting related to the engine may be also explained in the Chassis volume and Engine volume. In this case, see the Chassis volume.

30. DISASSEMBLY AND ASSEMBLY Excavator
This section explains the special tools and procedures for removing, installing, disassembling, and assembling each component, as well as precautions for them. In addition, tightening torque and quantity and weight of coating material, oil, grease, and coolant necessary for the work are also explain.

90. OTHERS (chassis volume)/Repair and replacement of parts (engine volume)
• Chassis volume
This section gives hydraulic circuit diagrams and electrical circuit diagrams.
• Engine volume
This section explains the method of reproducing, repairing, and replacing parts.

Handling during cylinder cut-out operation
a Reduced cylinder mode operation means to run the engine with the fuel injectors of 1 or more cylinders disabled electrically to reduce the number of effective cylinders. The purposes and effects of this operation are as follows.

1. This operation is used to find out a cylinder which does not output power normally (or, combustion in it is abnormal).
2. If the engine speed and output remain the same as the normal operation (full-cylinder mode operation) when a cylinder is set to noinjection in the cylinder cut-out operation, existence of a failure on the subject cylinder should be suspected.
Followings are the potential causes.
Leakage from the cylinder head gasket Defective injection from the injector Failure on the piston, piston ring or cylinder liner
•-Failure on the valve mechanism (valve operating system)
•-Failure in the electrical system
3. Since the common rail fuel injection system controls the injector of each cylinder electronically, the operator can perform the reduced cylinder mode operation easily with switches to find out a defective cylinder.
a See the section of Special functions of machine monitor when turning on the cylinder cut-out operation