Komatsu D31EX-21, D31PX-21, D37EX-21, D37PX-21, D39EX-21, D39PX-21 Bulldozer Shop Manual

Covers Komatsu crawler dozer models D31EX-21, D31PX-21, D37EX-21, D37PX-21, D39EX-21, D39PX-21. Includes specifications, diagrams, and detailed repair procedures. Ref: SEBM035005

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Document Details

Document Number / Seller:: 30621 / Rebecca Murphy
File Size:: 37.66 MB
File Type:: PDF
Language:: English
Pages:: 745
Printable:: Yes
Category:: Bulldozer
Last updated / verified: Dec 30, 2025

Models Covered & Key Technical Specifications

Komatsu D31EX-21, D31PX-21, D37EX-21, D37PX-21, D39EX-21, D39PX-21 (SEBM035005) - 2007 Covers D31EX-21, D31PX-21, D37EX-21, D37PX-21, D39EX-21, D39PX-21 bulldozer models. | Komatsu Shop Manual for Crawler Dozer Models

Designated Technical Resolution Data: 1200 dpi establishes the maximum print output Architecture.
Verified Print Rate: For optimal operation, 25 ppm defines the maximum printing consumption Threshold.
Nominal Unit Dimensions: 4015 mm -- signifies the overall machine length Parameters.
Defined Bolt Torques: The formatter board requires 46 Nm for standard operation Logic.
Key Displacement Data: Maximum throughput reaches 40.2 cc/rev Configurations.
Essential Thermal Envelope: The plotter requires 30 mm for standard operation Configurations.

Manual Description & Preview

Structured Shop Wiring Manual: Komatsu Shop Manual for Crawler Dozer Models D31EX-21, D31PX-21, D37EX-21, D37PX-21, D39EX-21, D39PX-21 2007 Diagnostic-Reference

System-Coverage: All models covered // Subsystem-Focus: Engine, HST, Work Equipment Logic // Reference-Category: Service Procedures

Metric	Technical-Path	Calibration-Standards
Engine Specs	Engine, Cooling System, Lubricants	Standard Values
HST System	Hydraulic Pump, HST Motor, Control Valve	Specifications
Work Equipment	Cylinders, PPC Valves, Blade, Ripper	Procedures
Chassis	Track Frame, Rollers, Sprockets	Maintenance Standards
Electrical	Wiring Diagrams, Monitor Panel, Sensors	Schematics
Troubleshooting	Failure Codes, Diagnostic Procedures	Repair Guidelines

Following OEM groupings, the manual includes sections on:

Engine Specifications and Maintenance Standards

This section systematically requiring engine-related specifications and essential maintenance values. It provides a Rigorous overview of engine performance parameters.

Hydraulic System Components and Operation

Service procedures are documented for HST pump, HST motor, and control valve systems, detailing their operation and maintenance requirements.

Work Equipment Systems

Calibration requirements are specified for lift, tilt, angle, and ripper cylinders and related PPC valves, ensuring precise operation.

Chassis Components and Maintenance

This section covers track frame, rollers, sprockets, and idlers, detailing their specifications and maintenance procedures.

Troubleshooting and Diagnostics

This section provides guidance on diagnosing and resolving common issues, including fault codes and repair procedures.

Electrical System and Monitor Panel Functions

It details the electrical system, monitor panel functions, and sensor information, crucial for system diagnostics.

FAQ

Calculate the **precise** pressure specifications for the HST main circuit?

40.2 – 44.1 MPa {410 – 450 kg/cm2} is the standard value for new machines for the main circuit pressure (Forward/Reverse, Left/Right).

What values **proper** assembly sequence are needed for the HST pump?

2.9 – 6.9 Nm {0.3 – 0.7 kgm} is the standard torque value for the spline shaft rotating torque.

Assess the **standard** service interval parameters for engine oil changes?

For fuel sulphur content below 0.5%, oil changes follow periodic maintenance hours; above 0.5%, follow specific tables (e.g., 1/2 of regular interval for 0.5 to 1.0%).

What components **necessary** system architecture includes for work equipment control?

The work equipment control system comprises a PPC system, blade control levers, blade PPC valves, and ripper control levers/valves for precise operation.

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