2004 Komatsu PC100-6, PC100L-6, PC120-6, PC120LC-6, PC130-6 Shop Manual (P/N SEBM010611)

• Covers the 2004 Komatsu PC100-6, PC100L-6, PC120-6, PC120LC-6, and PC130-6 series, documenting specific mechanical components and hydraulic system configurations for the S4D102-1 and SAA4D102E-2 engine setups.
• Official Komatsu publication SEBM010611, printed in Japan 04–02(02), and provided as a PDF.
• Contains over 150 detailed structural diagrams, hydraulic system flow schematics, and comprehensive torque-specification tables for standard hardware and flared fittings.
• Includes detailed weight tables for major assemblies, including track frames, counterweights, and boom or arm cylinders.
• Explains the complete disassembly and assembly of the final drive, swing motor, center swivel joint, control valve, and PTO.
• Analyzes critical subjects including troubleshooting, testing and adjusting, maintenance standards, the machine monitor system, the electronic control system, and the CLSS.
• Features indexable conversion tables for pressure, temperature, and torque units to aid in technical assessments.
• This 865-page technical documentation provides the foundational schematics and system descriptions for the 2004 Komatsu PC100–130-6 range. It serves as an authoritative reference for factory-specified mechanical standards and component layouts.

System Structure and Hydraulic Documentation

This reference details the internal systems of the Komatsu PC100-6 and PC130-6 series. It breaks down the fundamental structure of the primary drivetrain, hydraulic pump assemblies, and power transmission components. Mechanics get a clear look at the inner workings of the swing machinery and track frames, mapping out the exact relationship between engine output and hydraulic activation. The text outlines the operational logic of the LS and PC valves. This clarifies exactly how hydraulic pump discharge adapts to actuator loads under varying field conditions. To support advanced electrical and hydraulic assessments, the manual provides Wiring diagrams, actual electric wiring diagrams, electrical circuit diagrams, hydraulic circuit diagrams, and general assembly drawings.

Diagnostics and Workshop Efficiency

To streamline daily workshop operations, this manual directly links service codes from the machine monitor system to the underlying electrical or mechanical faults. This allows technicians to pinpoint pressure drops and verify component wear without outsourcing the job to an expensive dealership. Furthermore, it supplies step-by-step instructions for tasks that usually require costly professional service, such as testing and adjusting fuel injection timing, setting valve clearances, measuring engine blow-by pressure, and properly bleeding air from the hydraulic cylinders and swing motor.

Component Specifications and Reference Data

Technical specifications for the PC100-6 and PC120LC-6 are documented across numerous quick-reference tables. For instance, the hydraulic tank capacity for these units is 140 liters, and the standard tightening torque for a 16 mm bolt is set at 279 Nm. The PC120-6 travel motor utilizes a variable displacement piston design. Each section includes precise data on sealants, lubricant volumes, and standard tolerances to help verify component wear during any repair. When servicing the travel motor, mechanics often encounter severely seized hold flange reamer bolts. Because these bolts are heavily secured with factory adhesive, forcing them out rapidly can destroy the threads and ruin the spindle. Recognizing such service pitfalls beforehand prevents catastrophic component failure during routine overhauls. Always verify system pressures and load limits against these factory baselines before operating or servicing heavy machinery to prevent equipment damage or personal injury.