Komatsu PC20-6 / PC30-6 / PC40-6 Shop Manual
Comprehensive repair and service guide covering PC20-6, PC30-6, and PC40-6 mini excavators. Essential for maintenance and diagnostics. Part Number SEBM020R0604.
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Models Covered & Key Technical Specifications
Komatsu Mini Excavator Shop Manual: PC20-6, PC30-6, PC40-6 - Repair & Service Guide
Komatsu PC20-6, PC30-6, PC40-6 (SEBM020R0604) -- Serial Numbers 10001 and up Service Documentation | Reference Edition.
- Prescribed Fastening Values: 13.2 Nm establishes the standard tightening torque for M8 bolts.
- Standard Threaded Fastener Data: For M12 bolts, 112 ± 9.8 Nm specifies the appropriate torque.
- Core System Fill: The hydraulic tank requires 45 L to reach optimal operating capacity.
- Rated Power Framework: 25 kg/cm² signifies the standard hydraulic pressure for the PC40-6 model.
- Technical Throughput Data: The engine operates at 900 +100/-0 rpm under standard conditions.
- Advanced Output Density: 0.5 mm defines the allowable valve clearance for the exhaust side of the PC40-6.
Professional Workshop Service Manual & Technical Specifications
Komatsu Mini Excavator Shop Manual: PC20-6, PC30-6, PC40-6 - Comprehensive Repair & Service Procedures
Calibration-Scope: PC20-6, PC30-6, PC40-6 // Performance-Values: Mini Excavator / Hydraulic System Logic // Design-Core: Service Manual.
| Specification | Technical-Path | Calibration-Data |
|---|---|---|
| Engine Speed | Low Idling | 900 +100/-0 rpm |
| Valve Clearance | Intake Valve | 0.2 mm |
| Compression Pressure | At low idling (SAE10W, min. 80°C) | Min. 1.5 kg/cm² |
| Fuel Injection Timing | Compression B.T.D.C. | 21 ± 1 degree |
| Hydraulic Tank Capacity | PC20-6 | 50 L |
| Swing Machinery Assembly | PC40-6 | 35 kg |
Outlining the operational framework across the "Structure and Function", "Testing and Adjusting", "Disassembly and Assembly", and "Maintenance Standard" sections. This manual provides a detailed overview of the machine's systems and components.
Structure and Function Overview
This section details the internal workings of key components like the power train, swing circle, and hydraulic systems, including diagrams and explanations.
Testing and Adjusting Procedures
Guidance is provided for engine checks, hydraulic pressure measurements, and fuel injection timing adjustments, ensuring optimal performance and diagnostics.
Disassembly and Assembly Instructions
Step-by-step procedures for removing and installing major components such as the engine, swing motor, and hydraulic cylinders are documented.
Maintenance Standards
This part of the manual outlines the judgment standards for inspecting disassembled parts and critical wear limits.
The document references torque specifications for critical components like cylinder head bolts to ensure proper seal compression uniformity.
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