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Komatsu

Komatsu D31EX-21 D31PX-21 D37EX-21 D37PX-21 D39EX-21 D39PX-21 Bulldozer Service Repair Workshop Manual

Komatsu D31EX-21 D31PX-21 D37EX-21 D37PX-21 D39EX-21 D39PX-21 Bulldozer Service Repair Workshop Manual

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Machine data plateRef 487401
Brand
Komatsu
Equipment
Tractors
Models covered
Rubin Series, Same
Format
PDF, searchable, print-ready
Delivery
Instant download after checkout
Language
English

What happens after you pay

  • Download link opens on the order page immediately
  • The same link is emailed to you — re-download any time
  • Open on phone, tablet or PC; print only the pages you need
  • Not sure it covers your serial range? Ask us before you buy
🏷️ Basic Information
Identification
Make:
Komatsu
Model:
D31EX-21, D31PX-21, D37EX-21, D37PX-21, D39EX-21, D39PX-21
Model Variant:
Bulldozer
Production Years Covered:
Not specified in manual (serial number ranges provided)
Serial Number Ranges:
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
👋 Introduction
Overview
Target Audience:
Owners, technicians, and restoration professionals
Market Position:
Comprehensive workshop manual for repair, maintenance, and troubleshooting
Key Features:
Complete service procedures, deep information on maintaining, assembly, disassembly, and servicing
📋 Manual Details
General
Coverage Areas:
All major systems for D31EX-21, D31PX-21, D37EX-21, D37PX-21, D39EX-21, D39PX-21 bulldozers
Page Count:
Not specified in manual
Manual Type:
Service Repair Manual
Language:
English
Format:
Digital PDF Manual
Delivery Method:
Instant download after purchase
📖 Manual Coverage
Systems Covered
Engine:
Complete engine repair and maintenance procedures
Transmission:
Transmission service, disassembly, and assembly
Hydraulic System:
Comprehensive hydraulic system coverage
Electrical System:
Wiring diagrams and electrical component diagnostics
Undercarriage:
Track and undercarriage maintenance and repair
Final Drives:
Final drive assembly and troubleshooting
Steering and Brakes:
Steering and brake systems coverage
Attachment Systems:
Blade and ripper operations
Climate Control (if applicable):
Not specified
Procedures Included
Maintenance:
Routine service and scheduled maintenance
Disassembly:
Step-by-step component disassembly instructions
Assembly:
Detailed assembly procedures with torque specs
Troubleshooting:
Diagnostic procedures and fault finding
Test and Adjustment:
Adjustment procedures for mechanical and hydraulic systems
Schematics:
Wiring and hydraulic diagrams
Technical Depth
Level of Detail:
Complete factory service manual with in-depth information
Parts Information:
Includes parts breakdowns and part numbers (where available)
📊 Manual Specifications
Technical
File Format:
PDF
Compatibility:
Works on Windows, Mac, Linux, iOS, Android (with PDF reader)
Requirements:
PDF reader software
Searchability:
Searchable text (digital source file retained)
Print Quality:
High resolution for clear printing
Binding Type:
Digital
Paper Type:
N/A - digital file
⚙️ Engine Specifications
Primary Engine
Engine Model:
Komatsu SAA4D102E-2
Type:
4-cylinder, 4-cycle, diesel
Displacement:
Not specified in manual
Net Power:
Not specified in manual
Fuel System:
Direct injection
Aspiration:
Turbocharged and aftercooled (from model code 'SAA')
🔧 Transmission
Main Transmission
Type:
Hydrostatic (based on model series)
Speeds:
Not specified in manual
Features:
Provides dual-path drive for precise steering and counter-rotation
📐 Dimensions
Exterior
Overall Length:
Not specified in manual
Overall Width:
Not specified in manual
Overall Height:
Not specified in manual
Wheelbase:
N/A - track type
Weights
Operating Weight (approx):
Not specified in manual
🛡️ Safety Features
Ratings
Crash Test Information:
N/A - off-highway bulldozer
Active Features
Braking:
Service and parking brakes as per standard bulldozer design
Steering:
Hydrostatic steering for predictable maneuvering
Passive Features
ROPS/FBOP:
Not specified in manual; factory availability expected
💡 Technology Features
Operator Interface
Instrumentation:
Comprehensive gauges and warning lamps
Machine Monitoring:
Standard electronic monitoring system
Optional Technologies
Telematics:
Komtrax ready (likely)
Blade Control:
Not specified
🔧 Maintenance
Service Intervals
Engine Oil:
Refer to maintenance schedule in manual
Hydraulic Oil:
Refer to maintenance schedule in manual
Transmission Oil:
Refer to maintenance schedule in manual
Coolant:
Refer to maintenance schedule in manual
Fluid Specifications
Engine Oil:
API class CH-4 or higher (typical), refer to manual
Hydraulic Oil:
ISO VG 32 or 46 (typical), refer to manual
Transmission Oil:
Refer to manual
Known Issues
Common Wear Items:
Track shoes, bolts, pins, bushings, cutting edge, hydraulic seals, filters
Notes:
Inspect for wear and replace as per manual
📚 Vehicle History
Heritage
Manufacturer:
Komatsu Ltd.
Model Evolution:
D31EX/D31PX/D37EX/D37PX/D39EX/D39PX series signify successive -21 upgrade
Production Location:
Not specified for these models
🏆 Awards & Recognition
Accolades
Awards:
N/A - no specific awards listed for this manual or model

Delivery & file format

This is a digital PDF download, not a printed book. After payment the download link appears on your order confirmation page and is emailed to the address you entered. Files open in any PDF reader on phone, tablet or computer and can be printed.

Check the serial range before you buy

Manufacturers change procedures and part numbers by serial-number break. If your data plate shows a serial prefix that is not listed above, contact us with the model and serial number and we will confirm coverage before you order.

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  • Instant download PDF link on your order page and by email right after payment.
  • Secure checkout Encrypted Shopify checkout — we never see your card.
  • Print-ready PDF Searchable text, print the pages you need for the workshop.
  • Phone, tablet, PC Open it in the cab, the workshop or the office.