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
Manual Preview
Sample pages from the Komatsu D31EX-21, D31PX-21, D37EX-21, D37PX-21, D39EX-21, D39PX-21 Bulldozer Shop Manual manual
Purchase & Download
Komatsu Models Covered & Key Technical Specifications
Models: Komatsu D31EX-21, D31PX-21, D37EX-21, D37PX-21, D39EX-21, D39PX-21
Sub-models / Variants: EX-21, PX-21, 400 mm Single shoe, 600 mm Single shoe, 600 mm Swamp shoe, 460 mm Single shoe, 635 mm Single shoe, 700 mm Swamp shoe
Build Years: 2007
Serial Numbers: D31EX-21 50501 and up, D31PX-21 50501 and up, D37EX-21 5501 and up, D37PX-21 5501 and up, D39EX-21 1501 and up, D39PX-21 1501 and up
Technical Data:
- Engine model: Komatsu SAA4D102E-2-B diesel
- Number of cylinders: 4
- Piston displacement: 3.92 liters {3,920 cc}
- Rated horsepower: 56–71 kW {75–95 HP} at 2,000–2,200 rpm
- Final drive type: Planetary gear, 2-stage reduction, splash lubrication
- Hydraulic pump type: Fix displacement external-gear type
- Max. pump pressure: 20.6 MPa {210 kg/cm²}
- Operating weight range: 7,130–9,200 kg
- Travel speed (quick shift mode): 0.8–8.5 km/h (variable) or 3.4–8.5 km/h (quick shift)
Komatsu Manual Features & Content Preview
Technical Scope and Data for Komatsu D31EX-21 through D39PX-21
- Covers 2007 Komatsu D31EX-21, D31PX-21, D37EX-21, D37PX-21, D39EX-21, and D39PX-21 bulldozers featuring the SAA4D102E-2-B diesel engine
- Official Komatsu publication SEBM035005, printed November 2007
- Includes 64 detailed structural diagrams, 7 hydraulic system schematics, and 8 standard torque tables for maintenance references
- File delivered as a direct download the moment payment clears
- Stored against your account so you can retrieve it after a hard-drive loss
- Full-text search finds any part number in seconds
- Laid out for standard letter and A4 printing
- This 745-page shop manual serves as the primary technical reference for serial-range-specific maintenance and component-level assembly data across the D31, D37, and D39 series configurations
Component and System Documentation
This 745-page OEM factory publication provides a structured look at the machine architecture, including the cooling systems, power trains, and HST hydraulic configurations. The text details structural and functional data for components such as the HST pump, planetary final drives, 3rd speed motors, and steering control assemblies. Maintenance standard sections provide criteria for determining if parts like tracks, rollers, or pins require replacement based on wear limits.
Specification Highlights and Reference Values
Technical data previews include torque settings for critical hardware, such as 46 Nm for formatter board components and specific taper screw torques for the 102 series engine series. The document documents engine displacement at 3.92 liters and provides pressure settings for the work equipment hydraulic system at 20.6 MPa. Electrical systems are defined by AEX-rated wire codes, while fluid capacities and lubricant grades for ambient temperatures are indexed for cold and high-heat operation. You can learn more about what an OEM service publication covers to understand how the data is categorized for your specific bulldozer model. Reference only — always consult a certified technician before performing service on this equipment.
An official 745-page Komatsu OEM workshop manual covering the 2007 D31EX-21 through D39PX-21 series, documenting engine, drivetrain, hydraulic, and structural specifications for the identified serial number ranges.
Manual FAQ, Purchase & Download Details
Customer Reviews
Read what our customers say about this Komatsu Bulldozer manual and share your own experience.