Komatsu PC88MR-6 Excavator Service Manual

Product Overview

This service manual provides detailed information on the Komatsu PC88MR-6 Excavator, covering its structural layout, function, and maintenance standards. It’s an essential guide for troubleshooting, testing, disassembly, and assembly procedures.

Key Features

• Comprehensive structural and functional analysis of components
• Detailed testing, adjusting, and troubleshooting guidelines with charts
• Step-by-step disassembly and assembly instructions with safety precautions
• Specifications for dimensions, performance, and technical charts

Benefits

• Improved understanding of machine components and their operations
• Efficient troubleshooting processes with clear problem-to-cause charts
• Safe and accurate dismantling and reassembly procedures
• Optimal machine performance through precise adjustments and specifications

Usage Recommendations

• Refer to the “General” section for dimensions and specification charts
• Use the “Structure, Function, and Maintenance Standard” section as a reference for understanding and troubleshooting
• Follow the “Testing, Adjusting, and Troubleshooting” section before and after repairs
• Adhere to the procedures outlined in “Disassembly and Assembly” for component installations and removals

Adjusting PC Valve

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If engine speed changes are observed under pressure or load variations, or if attachment speeds are inadequate despite normal measurements, adjustments to the PC valve are necessary. Follow the outlined procedure for adjustment:

• Mark the positions (a) between the adjusting nut and screw before loosening nut (2).
• Loosen nut (2) and adjust the pump torque with screw (3) while monitoring the engine speed.
• Due to the PC valve’s eccentric nature, thorough monitoring is required during the adjustment.
• After adjustment, maintain the screw (3) position and secure the nut (2).