Komatsu PC20-6 / PC30-6 / PC40-6 Shop Manual • P/N SEBM020R0604

Technical Documentation for the Komatsu PC20-6, PC30-6, and PC40-6

• Covers 1989 Komatsu PC20-6, PC30-6, and PC40-6 mini excavators across all documented serial ranges (including 24001+ for the PC20-6 and 10001+ for the PC30-6/PC40-6)
• Official Komatsu publication SEBM020R0604
• Features 64 hydraulic circuit schematics and system diagnostic charts
• Contains 345 pages of factory-level specifications, fluid capacities, and maintenance standards
• Available as an instant download directly to your device for immediate shop-floor access
• Allows printing of individual sections to keep your digital copy clean during a repair
• Provides mandatory factory settings for the 3D84 and 3D95S-W engine series

Component and System Overview

This shop manual outlines the structural and functional design of primary machine systems to support heavy equipment mechanics and experienced technicians. Major chapters detail the power train, hydraulic triple gear pump, and travel motor assemblies. Comprehensive technical summaries examine the swing circle, center swivel joint, and control valves. To simplify field diagnostics, the electrical diagrams map out exact wiring colors and circuit pathways. The documentation provides necessary baseline data for interpreting test and adjustment parameters for work equipment. Before inspecting high-pressure hydraulics or structural components, always follow standard shop safety protocols to prevent injury.

Specification and Reference Values

Machine performance relies on strictly established standard values. The manual lists essential torque requirements for threaded fasteners, specifying 13.2 Nm for M8 bolts and 112 ± 9.8 Nm for M12 bolts. You will find the exact coolant system capacity listed at 5.0 liters for the PC20-6 and PC30-6 models. Standard engine idle speed is documented at 900 +100/-0 rpm. Additionally, the table of judgment specifies an exhaust valve clearance of 0.5 mm for the PC40-6, which also features a 60-liter hydraulic tank capacity. Utilizing these exact OEM metrics ensures that every machine repair matches original factory tolerances perfectly.