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The Komatsu PC20-6,PC30-6,PC40-6 Hydraulic Excavator Workshop Service Repair Manual SN: 24001 and up 10001 and up — a factory-style reference for maintenance, diagnostics and full repair procedures on your Komatsu excavator. Covers engine, hydraulics, electrical and wiring, drivetrain and undercarriage with the specifications, torque values and step-by-step instructions the job requires.