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The KOMATSU D20PL,PLL,AG-7 P,PG-7A, D21A,S,AG,QG-7 DOZER 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.