Komatsu D80A-12 / D85A-12 Bulldozer Shop Manual

This manual details service procedures for the Komatsu D80A-12 and D85A-12 bulldozers. It provides comprehensive information on all major components and systems for maintenance and repair. PN 06-76 (03) 03001.

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Technical Safety Notice
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This official OEM document is intended for professional technicians and skilled operators. Performing service on mechanical equipment involves inherent risks. By purchasing, you acknowledge that RepairLoader provides original manufacturer data for informational purposes. Always prioritize safety: use correct tools, wear protective gear, and consult a certified professional if you are uncertain of any procedure.

Komatsu Models Covered & Key Technical Specifications

Models: Komatsu D80A-12, Komatsu D85A-12
Sub-models / Variants: Angledozer, Tilt Dozer
Build Years: 1968-1976
Serial Numbers: 10001 and up
Technical Data:

  • Engine: Cummins NH-220-CI diesel
  • Flywheel Horsepower: 180 HP
  • Piston Displacement: 12170 cc (743 cu. in.)
  • Transmission Type: Constant-mesh (D80A-12), Planetary gear/multiple disc clutch (D85A-12)
  • Operating Weight: 20000 kg (44,092 lb) to 20600 kg (45,410 lb)
  • Fuel Tank Capacity: 420 liters (111 U.S. Gal.)
  • Control Valve: Spool type, Raise/hold/lower/float positions
Technical Specifications
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Document Number / Seller:
30623 / Richard Peterson
File Size:
43.83 MB
File Type:
PDF
Language:
English
Pages:
378
Printable:
Yes
Category:
Bulldozer
Last updated / verified
Aug 26, 2025

Komatsu Manual Features & Content Preview

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

  • Covers 1968–1976 Komatsu D80A-12 and D85A-12 Angledozer and Tilt Dozer models, documenting heavy-duty bulldozer systems and powertrain architecture
  • Official Komatsu publication P/N 06-76 (03) 03001, printed 1968
  • Contains 46 detailed exploded-view mechanical diagrams and 15 hydraulic and power train schematics
  • Downloads to your account within seconds of checkout
  • Re-download the file any time, no expiration
  • OCR text layer lets you jump to a torque spec by keyword
  • Suitable for printing individual sections for shop-floor use
  • This 378-page technical manual serves as the primary factory documentation for the 10001-up serial number range
  • Only edition that documents the D80A-12/D85A-12 powertrain configuration, including the Torqflow transmission details and main clutch booster hydraulics

Component and System Documentation

The manual provides technical documentation for the complete Komatsu D80A-12 bulldozer, spanning all major assemblies from the Cummins engine to the undercarriage. Sections cover the removal and identification of the main clutch, torque converter, and steering systems. The publication explains the interlock system within the transmission shift mechanism and outlines flow diagrams for the lubrication and hydraulic circuits, helping owners identify the function of spools, relief valves, and scavenging pumps.

Specification and Reference Data

Technical data is provided for critical assemblies, including steering system tolerances and fluid capacities. Coolant capacity is listed at 66 liters for the bulldozer. Engine mount torque values are documented for centering procedures. Intake valve clearance is specified in the engine tolerances table. The manual specifies 140 kg/cm2 (2,000 PSI) as the pressure setting for both blade and tilt cylinders. This 378-page factory workshop manual for the 1968–1976 Komatsu D80A-12 and D85A-12 documents engine, chassis, electrical, and hydraulic specifications for the 10001-up build series.

Manual FAQ, Purchase & Download Details

Can I view the power train layouts for the D80A-12 and D85A-12 in the manual? keyboard_arrow_down

Manual includes schematic diagrams of the power train systems that reference the engine, steering clutch, bevel gears, and final drive systems for these bulldozer models.

Which chapters or sections contain component breakdown diagrams and parts illustrations? keyboard_arrow_down

Shop manual contains various chapters dedicated to machine systems such as the engine, transmission, and steering system. These sections provide exploded views and structural diagrams to assist with visualizing component assembly and arrangement.

What machine specifications are detailed in the data tables within this document? keyboard_arrow_down

Specification tables include technical data such as operating weight, travel speeds, engine performance metrics, and fluid capacities for both the D80A-12 and D85A-12. Additionally, the manual lists dimensional values for undercarriage components and hydraulic cylinder parameters.

Does the document provide publication and edition identifiers for the Komatsu D80A-12 and D85A-12 shop manual? keyboard_arrow_down

Manual displays the publication reference 06-76 (03) 03001 on the cover and throughout the document as the primary identifier.

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