Komatsu D80A-12 / D85A-12 Bulldozer Repair Manual • P/N 06-76 (03) 03001, printed 1968

Inside the Komatsu D80A-12 and D85A-12 Shop Manual

This 378-page technical reference (P/N 06-76 03 03001) serves as the primary factory documentation for the 10001-up serial number range. It covers heavy-duty systems across 1968–1976 Angledozer and Tilt Dozer models.

• Instant digital download: Access the PDF immediately after checkout and re-download the file anytime.
• Searchable OCR text layer: Type in a keyword to jump straight to the exact torque spec or part identification you need.
• Shop-ready format: Print individual sections to bring directly to the workbench.
• Extensive visuals: Features 46 exploded-view mechanical diagrams and 15 hydraulic and powertrain schematics.
• Exclusive configuration details: The only edition documenting the Torqflow transmission and main clutch booster hydraulics for these specific builds.

Component and System Breakdown

Tackling a major tear-down requires accurate factory data. This publication outlines the complete D80A-12 and D85A-12 architecture, spanning everything from the Cummins engine block to the undercarriage. You get detailed component identification for the main clutch, torque converter, and steering systems. It breaks down the transmission shift mechanism's interlock system. Furthermore, clear flow diagrams map out the lubrication and hydraulic circuits. This makes it significantly easier to identify the exact function of individual spools, relief valves, and scavenging pumps during diagnostics.

Critical Workshop Specifications

Guessing clearances on heavy machinery leads to costly rework. The manual lays out exact technical data for critical assemblies, including steering system tolerances and fluid capacities. For example, it lists the bulldozer coolant capacity at 66 liters and specifies 140 kg/cm² (2,000 PSI) as the precise pressure setting for blade and tilt cylinders. You will also find specific engine mount torque values for centering procedures and exact intake valve clearances. Always verify machine stability and fully relieve hydraulic pressure before disconnecting lines or servicing these heavy assemblies, as residual energy poses a severe injury risk.