2001 and Up Komatsu D39EX-21 & D39PX-21 Shop Manual

2001 and Up Komatsu D39EX-21 and D39PX-21 Technical Scope

• Covers the 2001 and up Komatsu D39EX-21 and D39PX-21 bulldozer series with both 460 mm, 635 mm, and 700 mm swamp shoe configurations
• Official Komatsu publication SEBM023810, dated November 2007, printed in Japan
• Contains 464 pages of technical specifications, structure and function diagrams, testing and adjustment procedures, and assembly information
• This Komatsu D39EX-21 shop manual is delivered as a direct download the moment payment clears
• Indexed PDF search covers every chapter and appendix to find part numbers or torque values instantly
• Suitable for printing individual sections for shop-floor use during service tasks
• Only edition that documents the engine-model mounting details and specific hydraulic system diagnostic procedures for the 21-series build

What the Manual Documents:

The Komatsu D39EX-21 and D39PX-21 shop manual provides comprehensive technical data regarding machine structure and maintenance standards. Organized into five primary sections, it guides the reader through general machine specifications, detailed system operations, and diagnostic standards. Chapters cover the structure and function of the cooling system, HST pump operation, and the steering/brake control mechanisms. Specific focus is placed on the power train system, including planetary final drive and variable bent-axis piston motor mechanics. Service data is presented for the engine control, charge pump, and hydraulic circuitry, including detailed flow control and pressure relief valve operations for the 3rd speed valve and shuttle valve assemblies.

Specification Highlights:

Detailed tables provide critical reference values for standard maintenance and assembly tasks. Engine performance data for the SAA4D102E-2 engine includes a 431 Nm maximum torque rating and 71 kW rated horsepower output. The Komatsu D39EX-21 operating weight is documented at 8,820 kg for the standard single-shoe configuration. Bolt tightening specifications for factory workshop documentation are provided for metric threads ranging from 6 mm to 39 mm, ensuring accurate assembly of chassis and internal components. Valve clearance settings and hydraulic pressure thresholds for the 20.6 MPa maximum discharge pressure are cataloged within the service standards. Reference only — always consult a certified technician before performing service on this equipment. This 464-page Komatsu OEM shop manual covers the 2001 and up D39EX-21 and D39PX-21, documenting engine, drivetrain, chassis, and hydraulic system specifications for this heavy-duty bulldozer series.