Komatsu D31EX-21, D31PX-21, D37EX-21, D37PX-21 Bulldozer Shop Manual (SEBM025608)

SEBM025608 is the 2007 shop manual for four small Komatsu dozers: the D31EX-21, D31PX-21, D37EX-21 and D37PX-21. They all use an HST drive and the SAA4D102E-2 engine.

Fits

D31EX-21 and D31PX-21 from serial 50001, and D37EX-21 and D37PX-21 from serial 5001.

Quick facts

• Manual Number: SEBM025608 (2007)
• Models: D31EX/PX-21, D37EX/PX-21
• Serials: 50001 / 5001 and up
• Engine: SAA4D102E-2
• Machine Type: Bulldozer
• Format: PDF, 465 pages

What's in it

After the general specs and fluids, section 10 covers the HST pumps and travel motors, final drive, brakes, steering, undercarriage, CLSS hydraulics, PPC valves, blade, ripper and electrical. Section 20 gives the standard values, pressure checks, adjustments and troubleshooting.

Section 30 covers removal, installation and rebuild of the main components, and section 90 has the hydraulic and electrical circuit diagrams.

These small HST dozers are popular with landscapers, farmers and small contractors. Hydrostatic drive problems need the right pressures to diagnose, and this book has them. One book covers all four models, which helps if you run a mixed fleet.

Table of contents

• 01 General - specs, weight table, fuel, coolant and lubricants
• 10 Structure, function and maintenance standard - HST pumps and travel motors, final drive, brakes, steering, undercarriage, CLSS hydraulics, PPC valves, blade, ripper, electrical
• 20 Testing and adjusting - standard values, pressure checks, adjustments and troubleshooting
• 30 Disassembly and assembly - removal, installation and rebuild of the main components
• 90 Others - hydraulic and electrical circuit diagrams

Good to know

A tip from shops that use these books every day: read the structure and function pages for a system before you start testing it. Knowing how the valves and circuits are meant to work makes the test results much easier to read. The standard values then tell you whether a reading is normal, borderline or out of spec, and the wear limits decide whether a part goes back in.

Before you buy

Check the model and serial plate. The D31 and D37 start from different numbers.

PDF, 465 pages, English. Download link straight after checkout. We're an independent seller with no link to Komatsu.