Description

Komatsu D37EXi-24, D37PXi-24, D39EXi-24, D39PXi-24 Workshop Manual

If you’re working on a Komatsu D37EXi-24, D37PXi-24, D39EXi-24, D39PXi-24 bulldozer and you’re relying on a third-party PDF or a greasy printout someone left in the toolbox, stop. I’ve seen guys burn an afternoon chasing a coolant leak because the aftermarket diagram had the hoses swapped. This Workshop Manual is the OEM factory document. 2910 pages of Komatsu’s own procedures, torque tables, and system layouts. Not a reprint. Not a condensed version. The real thing.

2910 Pages of Factory-Specified Procedure

That page count isn’t filler. Section 01 – Specifications alone includes separate specification drawings for each model: D37EXi-24, D37PXi-24, D39EXi-24, D39PXi-24. You get weight tables, fluid capacities, and the standard tightening torque table with fastener sizes and foot‑pound values. Need the charge pressure on the HST circuit? That’s in the cooling system chapter, page 73 of the PDF. Every spec is in imperial units – no conversion math needed on the bench.

What the Foreword and Safety Section Covers

Page 00-26 starts with “How to Read the Shop Manual” – something most guys skip and then wonder why they missed a note about pre-filling the oil filter. The safety section isn’t a liability disclaimer; it’s job‑site protocol. Precautions for DEF handling, AdBlue storage, and the exact actions to take if a fire occurs. The manual even walks you through disconnecting Deutsch connectors and slide‑lock types without breaking the tabs. I don’t care how many years you’ve been turning wrenches – read the part about push‑pull couplers on page 00-58 before you crack that hydraulic line.

Urea SCR System: AdBlue/DEF Handling and Inducement Strategy

Chapter 10 covers the structure and function of the Urea SCR system. Layout drawing, system diagram, and the actual inducement strategy that the ECM uses when DEF quality is off. If you’ve ever had a machine derate on a job and didn’t know why, that section alone saves a diagnostic loop. The manual also details the AdBlue/DEF mixing tube, SCR assembly, tank heating valve, and the pump. No generic “remove and replace” – real step‑by‑step with o‑ring sizes and torque values for the injector line.

Cooling Fan Control and Hydraulic Oil Cooler Bypass

The cooling system chapter gives you the cooling fan control system diagram and the function of the hydraulic oil cooler bypass valve and HST charge safety valve. Most aftermarket documents omit the bypass valve spring rate or the cracking pressure. This manual lists the specs. You can also find the KCCV ventilator and EGR valve in the engine system section – variable flow turbocharger included. Don’t try to diagnose a high‑exhaust‑temperature code without the exhaust throttle valve sequence from this book.

Source Authenticity: Komatsu OEM vs Aftermarket Reprints

I’ve said it before and I’ll say it again: aftermarket manuals are someone’s best guess. This one is scanned from the original Komatsu binder – the same document dealer techs use. The wiring diagrams are factory color codes, the torques are from Komatsu’s own standard tightening torque table, and the conversion table is there so you don’t mix Newton‑meters with foot‑pounds. If you’re comparing this to a Komatsu WA65-5 WA70-5 WA80-5 2005 Workshop Manual, that one covers wheel loaders, different chassis. Get the right manual for the right iron.

For smaller Komatsu equipment, check Komatsu WH609-1E0 WH613-1E0 WH713-1E0 WH714H-1E0 WH716-1E0 Workshop Manual – that’s for excavator attachments. And if you need something for a smaller dozer, Komatsu PW95R-2 Workshop Manual – 520 Pages of Factory Specs is a different frame size. But for the D37/D39 series with the intelligent control system, this is the only manual you want.

Does this manual cover the D37EXi-24 serial number 85001 and up?

Yes. The front page lists serial numbers starting at 85001 for D37EXi and D37PXi, and 95001 for D39EXi and D39PXi. You’re covered from those break points forward.

What torque values are listed?

The standard tightening torque table is in the foreword section. Plus every specific bolt in the procedures – like the damper bolts, EGR valve, and AdBlue/DEF injector – has its own torque callout in the chapter.

Does this include the automatic idle stop system and KOMTRAX?

Section 10 covers the automatic idle stop system diagram and function. The foreword has a practical use of KOMTRAX section. It’s all there – you don’t need a separate electronics manual for these features.

Are the wiring diagrams in color?

The PDF is full color, so the wire codes (how to read electrical wire code is explained on page 00-53) are accurate. The letter codes for wire cross‑section, insulation color – exactly like the factory harness.

You need the right information before you pull a turbocharger or open the urea system. Afternoon jobs turn into two‑day repairs when you’re guessing. Get the factory data, get it right the first time. Access the Factory Manual now and keep it on your phone or tablet next to the machine. No more digging through forums for the wrong torque.

Related manual: Manual Transmission – different topic, but if you’re working on powertrain, don’t confuse it with the dozer’s hydrostatic transmission. Manual Transmission is a broader category; stick with this Komatsu book for the bulldozer.