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

Covers Komatsu D39EX-21 & D39PX-21 bulldozers with detailed diagnostic procedures, component service, and troubleshooting. Ref: SEBM023810

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Document Details

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Document Number / Seller:
30779 / Lisa Scott
File Size:
39.81 MB
File Type:
PDF
Language:
English
Printable:
Yes
Category:
Bulldozer
Last updated / verified
Feb 21, 2025

Models Covered & Key Technical Specifications

Komatsu D39EX-21 & D39PX-21 (SEBM023810) – 2001 and Up Covers Komatsu D39EX-21 and D39PX-21 bulldozers with detailed diagnostic procedures, component service, and troubleshooting. Ref: SEBM023810 | Collection Dossier

  • Measured Precision Specs: 71 kW engine rated horsepower signifies the maximum power output specification.
  • Factory Torque Data: 4.200 mm overall length is standardized to the chassis design Architecture.
  • Approved Volume Data: 2,770 mm overall height (not including antenna) determines the environmental limit Framework.
  • Reference Running Clearance: 8,820 kg operating weight is calibrated to the base machine weight Threshold.
  • Critical Heat Tolerance: 4.3 km/h forward 1st speed achieves the standard travel performance Benchmarks.
  • Measured Installation Footprint: 30 degrees gradeability corresponds to the maximum incline capability Parameters.

Professional Workshop Service Manual & Technical Specifications

Komatsu D39EX-21 & D39PX-21 (SEBM023810) – Comprehensive Service, Repair & Diagnostics Manual Documentation-Set

System-Coverage: D39EX-21, D39PX-21 // Subsystem-Focus: Crawler Tractor / Hydraulic System Logic // System-Coverage: Component Replacement & Maintenance

Table of Contents Summary

  • Chapter 10: Structure and Function, Maintenance Standard
  • Chapter 20: Testing and Adjusting
  • Chapter 01: General
  • Chapter 30: Disassembly and Assembly
  • Chapter 90: Others (Chassis Volume)/Repair and Replacement of Parts (Engine Volume)

This shop manual provides essential technical information for servicing Komatsu D39EX-21 and D39PX-21 bulldozers. It covers system overviews, component specifications, and detailed procedures for maintenance, repair, and diagnostics.

Component locations are identified for all major systems, including the power train, hydraulic equipment, and engine control.

Service procedures are documented for disassembly, assembly, and testing across various components.

Calibration requirements are specified for critical systems like the HST pump and various control valves.

Electrical system documentation covers wiring diagrams and component identification for troubleshooting.

Suspension service documentation covers track frame and roller assembly procedures.

This manual documents torque specifications for critical components to ensure proper pivot-point integrity.

FAQ

Reference the **specified** tool requirements for disassembly. keyboard_arrow_down

4.200 mm overall length for the D39EX-21 and 4.220 mm for the D39PX-21 are listed in the specifications section, requiring specific measurement tools for disassembly procedures.

What are the **essential** electrical values for troubleshooting? keyboard_arrow_down

Voltage readings for the starting switch, battery charging system, and sensor circuits range from 12 V to 24 V, with specific continuity and resistance values provided in the electrical system diagnostics section.

Specify the **correct** calibration settings for the HST pump. keyboard_arrow_down

Variable displacement piston pump and gear pump specifications indicate a theoretical discharge amount of 63 cc/rev for the variable pump and 35 cc/rev for the charge pump.

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Rated 4 out of 5 stars
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This manual has been incredibly helpful. The detailed diagrams and troubleshooting steps are a lifesaver! The download process was smooth and I received my link promptly.