Komatsu D20A-6, D20P-6, D20P-6A, D20PL-6, D20PLL-6, D20S-6, D20Q-6, D21A-6, D21E-6, D21P-6, D21P-6A, D21P-6B, D21PL-6, D21S-6, D21S-6A, D21Q-6 Shop Manual

Technical Scope for the Komatsu D20 and D21 Series

• Covers 1992–2003 Komatsu D20A-6, D20P-6, D20P-6A, D20PL-6, D20PLL-6, D20S-6, D20Q-6, D21A-6, D21E-6, D21P-6, D21P-6A, D21P-6B, D21PL-6, D21S-6, D21S-6A, and D21Q-6 bulldozers
• Original OEM publication SEBM01040604, printed in Japan, dated 03-90(01)03381
• Contains 493 pages of structural breakdowns, assembly diagrams, and maintenance standards for the 4D95S-W-1 engine and powertrain
• Downloads to your account within seconds of checkout
• Re-download the file any time, no expiration
• Suitable for printing individual sections for shop-floor use
• Indexed PDF search covers every chapter and appendix
• This 493-page factory shop manual serves as the primary technical reference for the 60001-and-up serial number range across the D20 and D21 bulldozer product lines

Component and System Coverage

This Komatsu D20 and D21 shop manual documents the engineering specifications and maintenance procedures required for the 4D95S-W-1 engine, alongside detailed breakdown of the power train, undercarriage, hydraulic systems, and electrical configurations. Chapters detail the structure and function of the Hydroshift transmission and planetary gear sets, providing necessary context for testing, adjusting, and overhauling the main clutch and steering clutch assemblies. The manual includes comprehensive exploded-view diagrams of the track group, bucket lift mechanisms for S/Q variants, and radiator guard assemblies.

Specification and Reference Data

Engine timing and performance values are documented for high and low idle ranges, with intake and exhaust valve clearances specified for cold-engine settings. Multi-stage torque values for cylinder head assembly and injection pump components are provided to maintain factory-grade tolerances. Fluid capacities for the engine oil pan, Hydroshift transmission case, and main clutch case are cataloged, alongside electrical circuit codes and wire-strand thickness classifications. Reference what factory workshop documentation is structured to understand the layout of these diagnostic charts and service intervals. Note: This page is a contents overview for the manual. It does not provide repair or diagnostic instructions. An official 493-page Komatsu OEM shop manual covering the D20/D21 series, documenting engine, powertrain, and hydraulic specifications for the 4D95S-W-1 powered 60001-and-up build.

Document Reference: SEBM01040604, 03-90(01)03381, Printed in Japan