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The Komatsu D21A-P, D21A-S, D21A-Q, D21A-6, D20A-P, D20A-S, D20A-Q, D20A-6 Bulldozer Service & Repair Manual — 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.