Manual Details

KOMATSU D31EX-21, D31PX-21, D37EX-21, D37PX-21, D39EX-21, D39PX-21 (JPN) BULLDOZER SERVICE REPAIR MANUAL SN 1001-1500 – PDF DOWNLOAD

The Service Repair Manual for the Komatsu D31, D37, and D39-21 series is the ultimate “shop-floor companion” for anyone serious about keeping their crawler dozer in peak condition. This is a detailed roadmap designed for the mechanics and owners who know that serial numbers 1001 through 1500 deserve expert care. Covering a broad range of models equipped with the reliable S4D95LE-3 and S6D102E-1 engines, these machines are powerhouses for precision grading and earthmoving. This PDF download puts factory-level wisdom in your pocket—giving you the exact torque values, pressure settings, and diagnostic secrets required to keep your equipment pushing without a hitch.

Model Number & Serial Number

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

What this service repair manual content covers

• General
• Structure and function
• Testing and adjusting
• Disassembly and assembly
• Maintenance standard
• Troubleshooting
• Maintenance standard
• Others

Why choose Sure Manuals?

At Sure Manuals, we understand that every hour your machine is down is money out of your pocket. That’s why we don’t just give you a messy scan—we provide high-resolution, fully searchable, and beautifully bookmarked PDF manuals that work as hard as you do. Our manuals are digital, meaning they won’t get covered in grease or lost in the back of a truck. With instant delivery, you can have the technical answers you need on your tablet or phone before you’ve even stepped onto the job site.

Who Should Use This Manual?

This manual is a must-have for:

• Service Technicians: Who need the “inside track” on engine overhauls and power train repairs for the -21 series.
• Mechanics: Who want to ensure every bolt on the steering and hydraulic system is tightened to factory-perfect specs.
• Fleet Managers: Who are dedicated to maximizing the life and value of their versatile Komatsu bulldozer fleet.
• Owner-Operators: Who take pride in doing their own maintenance and knowing their D31/D37/D39-21 inside and out.

Service Repair Manual includes:

• The full “playbook” for the Komatsu S4D95LE-3 and S6D102E-1 engines
• Detailed, easy-to-read electrical and hydraulic system diagrams
• Specific torque values to take the guesswork out of assembly
• Pro-level troubleshooting for mechanical and hydraulic issues
• Clear tables showing exactly where your undercarriage stands on wear
• Step-by-step removal and installation guides for all major components

Frequent Ask Questions (FAQ)

Which serial numbers does this manual cover?
This specific manual is designed for machines within the SN 1001-1500 range.

How fast can I get this manual?
Immediately. As soon as you purchase, an instant download link hits your inbox.

Can I view this on the job site?
Absolutely. The PDF works perfectly on smartphones, tablets, and laptops for field repairs.

Is this the same manual the dealer uses?
Yes, this is the official OEM factory shop manual used by professional Komatsu technicians.