Komatsu 170-3 2005 Workshop Manual

We have a Komatsu 170-3 2005 workshop manual here that weighs in at 430 pages. That’s not padding. That’s real OEM content covering everything from the cylinder head to the HPI fuel injection system. If you’ve ever had to chase down a torque spec from a third-party reprint and found it was off by 10 ft-lbs, you know why this matters.

Engine Body and Valve System: Factory Procedures

Chapter 11 breaks down the entire engine body – cylinder head, cylinder block, main circulation system, flywheel, vibration damper, gear train, timing gear, and the valve system. Each component gets its own section with exploded views and assembly notes. The valve clearance adjustment procedure is on the Testing and Adjusting chapter, but the structural drawings here show you exactly where every shim goes. If you’re pulling a cylinder head on a 170-3, this is the reference you need.

Why Use the OEM Komatsu 170-3 Manual?

Aftermarket manuals often combine multiple models into one book, then leave out the specific fuel pump pressure control circuit or the exact error code list. This OEM manual is model-specific. The HPI fuel injection system diagrams are sourced directly from Komatsu’s engineering department. You get the standard value tables for troubleshooting – oil pressure, blow-by pressure, compression pressure – all with the factory tolerances. No guessing.

12 Testing and Adjusting: The Troubleshooting Section

Pages 12-1 onward contain the diagnostic procedures. Need the charge pressure? Page 12-5-1. The troubleshooting charts are split into two modes: S Mode for mechanical issues (starting problems, black smoke, oil consumption) and EA Mode for the engine controller system with error codes like 111, 115, 121. Each code has a specific action plan. The standard value table for electrical parts gives you resistance and voltage readings for sensors. This is the section that will save a tech from replacing parts that aren’t broken.

6 Chapters That Cover Every System

01 General – specs and overall drawings. 11 Structure and Function – intake/exhaust, engine body, lubrication, fuel, cooling, electrical. 12 Testing and Adjusting – full diagnostic workflow. 13 Disassembly and Assembly – how to take it apart and put it back. 14 Maintenance Standard – wear limits and inspection intervals. 15 Repair and Replacement – what to replace and how. No filler, no fluff.

Download the Factory Manual for Your Shop

This 430-page PDF is the exact same document that Komatsu issued to dealers in 2005. Not a reprint, not a scan of a scan. The torque specs are the ones that keep head gaskets sealed and injectors timed. The wiring diagrams for the starting aid, alternator, and HPI controller are clear enough that you can trace a short without pulling the entire harness. Read the warnings first – there’s a whole section on precautions when operating the engine as an individual part. Then get the right tool list from the front of chapter 12. You’ll save hours of backtracking.

Related manuals: Komatsu 170-3 Diesel Engine 2008 Workshop Manual, KOMATSU 170-3 2002 Workshop Manual, Komatsu WA65-5 WA70-5 WA80-5 2005 Workshop Manual. For general drivetrain info, see Manual Transmission and Manual Transmission.

Does this manual cover the WA65-5 loader?

No, this is for the 170-3 engine only.

Can I use it for a 2002 model?

The 2005 manual supersedes earlier revisions. You’ll want the specific year manual. KOMATSU 170-3 2002 Workshop Manual covers that.

Are torque specs in ft-lbs?

Yes, all torque values are given in both metric and imperial. The standard value tables list foot-pounds for cylinder head bolts, main bearing caps, and more.

What about the HPI fuel system?

The HPI system is covered in detail in chapters 11 and 12. You’ll find the fuel pump pressure control circuit diagram, troubleshooting for injectors, and error codes for the engine controller. The manual gives you the diagnostic procedures step by step, including handling equipment in the fuel circuit and bleeding air. If you’re dealing with an error code like 111 or 115, the EA mode troubleshooting charts tell you exactly what to check. It also covers the fuel cooler and filter replacement intervals from the maintenance standard chapter.

Download the Factory Manual