Komatsu PC20-6 / PC30-6 / PC40-6 Shop Manual

Technical Scope and Coverage for the Komatsu PC20-6, PC30-6, and PC40-6

• Covers the 1989 Komatsu PC20-6, PC30-6, and PC40-6 mini excavators across all documented serial number ranges including the 24001+ PC20-6 and 10001+ PC30-6/PC40-6 variants
• Official Komatsu publication SEBM020R0604, referencing the 1989 production specifications
• Features 64 detailed hydraulic circuit schematics and diagnostic charts for the entire hydraulic system
• Contains 345 pages of factory-level technical data, including torque tables, fluid specifications, and maintenance standards
• Accessible from your device as soon as the order is placed
• Suitable for printing individual sections for shop-floor use
• This reference edition provides the specific factory settings required for the 3D84 and 3D95S-W engine series found in these excavators

Component and System Documentation

The Komatsu PC20-6, PC30-6, and PC40-6 shop manual outlines the structure and functional design of every primary machine system. Major chapters focus on the power train, hydraulic triple gear pump, and travel motor assemblies. Detailed technical summaries examine the function of the swing circle, center swivel joint, and control valves. Electrical diagrams define wiring colors and circuit pathways to simplify diagnostic tasks for field technicians. The what an OEM service publication covers documentation section provides the necessary context for interpreting the provided test and adjustment procedures for all machine control levers and work equipment.

Specification and Reference Values

Technical performance is characterized by established standard values for engine speed, hydraulic pressure, and valve clearances. The manual documents torque for threaded fasteners such as M8 bolts at 13.2 Nm and M12 bolts at 112 ± 9.8 Nm. Coolant system capacity is listed at 5.0 liters for the PC20-6 and PC30-6 series. The engine idle speed is documented at 900 +100/-0 rpm for standard operations. Valve clearance for the PC40-6 exhaust side is specified at 0.5 mm in the table of judgement. Hydraulic tank capacity for the PC40-6 is documented at 60 liters. Note: This page is a contents overview for the manual. It does not provide repair or diagnostic instructions. An official 345-page Komatsu shop manual covering the PC20-6, PC30-6, and PC40-6 mini excavators, documenting engine, hydraulic, electrical, and structural specifications for these serial-identified machine models.