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The KOMATSU PC400-6, PC400LC-6, PC450-6, PC450LC-6 Hydraulic Excavator Operation & Maintenance Manual (S/N: 32488 and up, 12629 and — 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.