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The KOMATSU D39EX-21, D39PX-21 BULLDOZER Operation & Maintenance Manual (S/N: 1201 and up, 1209 and up) — a factory-style reference for maintenance, diagnostics and full repair procedures on your Komatsu crawler dozer. Covers engine, hydraulics, electrical and wiring, drivetrain and undercarriage with the specifications, torque values and step-by-step instructions the job requires.