Komatsu 170E-5 Workshop Manual

If you’re working on a 170E-5 and you grab some aftermarket “repair guide” off the internet, you’re asking for trouble. I’ve seen guys torque head bolts to generic numbers and blow a gasket in 50 hours. This Komatsu 170E-5 Workshop Manual is the actual factory document – 685 pages of spec-driven content that tells you exactly what Komatsu wants you to do. No guesswork, no “close enough.” You get the standard tightening torque table, the valve clearance numbers, and the blow-by pressure limits. That’s the difference between a job that stays fixed and one that comes back on a hook.

That file you see there – it’s the genuine OEM print, not a third-party rewrite. The Table of Contents alone runs from 00 Index and Foreword through 40 Troubleshooting. Section 00 has the safety notice (read it – I don’t care if you’ve done this for twenty years, the torque values change) and how to read the electric wire code for the engine harness. Section 01 gives you the engine performance curves and weight table. If you need the exact mass of a 170E-5 to plan your lift, it’s in there. No shorthand.

Komatsu 170E-5 Workshop Manual: What You Get

You get seven major sections. The Index and Foreword (00) covers how to read the shop manual, handling of connectors, and the standard tightening torque table. Specification (01) gives you outlines, specs, general views, and performance curves. Structure, Function and Maintenance Standard (10) is split into two parts: Part 1 handles the air cleaner, turbocharger, EGR system, cylinder head, cylinder block, crankshaft, camshaft, connecting rod, piston assembly, flywheel, vibration damper, gear train, timing gear, valve system, rocker arm, crosshead, and tappet. Part 2 covers lubrication (oil pump, filter, cooler), fuel system (CRI system diagram, fuel piping, electric priming pump, engine controller cooler), cooling system (water pump, thermostat, fan drive), and electrical equipment (alternator, starting motor, starting aid, engine controller). That’s the meat of the manual – 685 pages of it. Every clearance, every wear limit, every torque spec.

If you’re looking for a companion document, check the Komatsu 170E-5 Series Engine Shop Manual”>Komatsu 170E-5 Series Engine Shop Manual for additional variant coverage. For a more compact version, the Komatsu 170E-5 Workshop Manual – 341 Pages of Factory Specs”>Komatsu 170E-5 Workshop Manual – 341 Pages of Factory Specs covers the basics, but this full 685-page edition gives you the complete troubleshooting and testing sections.

Why OEM Factory Specs Matter

I’ve had it up to here with aftermarket manuals that list “typical” torque values. Typical doesn’t work on a 170E-5. The head bolt torque sequence in this manual comes straight from Komatsu’s engineering – not some copy-paste job. The standard tightening torque table in the foreword gives you the exact ft-lbs for each fastener size and grade. The Standard Service Value Table (section 20) has the running-in standards and performance test standards. If you skip those, you’ll have a high-oil-consumption engine that burns blue smoke from day one. This manual also includes the Conversion Table – metric to imperial – because I know some of you still have both sets of wrenches. The Safety Notice is right up front. Pay attention to the handling of electric equipment and hydraulic components – the 170E-5 uses a common-rail injection system with high pressure. Release residual pressure before you crack a line. Section 30 tells you how.

Testing and Adjusting – What Tools You Need

Section 30, Testing and Adjusting, starts with a tools list. It shows sketches of special tools – not just generic pictures. You’ll see the exact adapters for testing air boost pressure, blow-by pressure, fuel pressure, and compression. The manual is divided into two sub-sections: With EGR and EGR-less. If your engine has the EGR system, you follow the procedures on testing EGR valve and bypass valve drive oil pressure. For EGR-less, the same basic tests apply but with different tool references. Valve clearance adjustment is in both – it gives you the cold clearance numbers. Compression pressure test gives you a minimum psi per cylinder. Blow-by pressure – if you see more than a certain CFM at rated RPM, you’re rebuilding. No guesswork. Unlike a Manual Transmission”>Manual Transmission rebuild guide that might cover generic gear lash, this engine manual is specific to the 170E-5. Every spec is numbered and referenced.

Turbocharger, EGR, and Cylinder Head – Section 10 Details

Part 1 of Section 10 dives deep. The Turbocharger section explains clearance checks for the shaft and bearings. The EGR system – if equipped – has its own maintenance standard for cooler and valve. The Cylinder Head section gives you flatness limits and valve recess specs. The Cylinder Liner protrusion limits are critical – you get them here. Main moving parts include the crankshaft journals, camshaft lobes, and connecting rod big-end bore. Piston ring end gap and side clearance – you need those numbers. The manual even covers the crosshead and guide for the valve train, which a lot of aftermarket sources skip entirely. For related equipment, see the Komatsu WA65-5 WA70-5 WA80-5 2005 Workshop Manual”>Komatsu WA65-5 WA70-5 WA80-5 2005 Workshop Manual if you’re working on wheel loaders with similar engines.

Troubleshooting Electrical Faults – E-Code System

Section 40 is the troubleshooting section. It starts with general information on troubleshooting – points to check, error code and failure code tables, and a connection table for connector pin numbers. Then it breaks down the E-mode electrical system. You get codes like E-1 [111/CA111] Engine Controller Internal Failure through E-4 [123/CA123] Charge (boost) Air Pressure Sensor High Error. Each code has a step-by-step diagnostic procedure. The manual also includes T-branch box and T-branch adapter tables for accessing pins. If you’re in the habit of probing wires without a reference, stop. This manual gives you the pin numbers and the expected voltage readings. It’s the same logic as a Manual Transmission”>Manual Transmission diagnostic guide – you need the correct reference points. Here, you have them.

Is This Manual for You?

If you’re a DIY mechanic pulling a 170E-5 out of a machine to rebuild it, you need this manual. If you’re a shop owner who wants to stop wasting billable hours on bad torque specs, you need this manual. The real-world use case: you’re replacing the cylinder liner and pistons. You need the protrusion measurement procedure and the correct piston ring gap. Section 10 gives you both. You need the final torque sequence for the cylinder head – section 30 covers it under adjusting valve clearance because you have to do that after torquing. This manual isn’t a summary – it’s the full factory procedure.

Does the manual cover both EGR and EGR-less engines?

Yes, Section 30 is split into two sub-sections: Testing and Adjusting (With EGR) and Testing and Adjusting (EGR-less). Each has its own tool list and procedures.

What about wiring diagrams and electrical troubleshooting?

The manual includes connection tables for connector pin numbers, a T-branch box adapter table, and full E-code troubleshooting for the engine controller. It covers codes E-1 through E-4 with step-by-step diagnostics. However, it does not include full machine chassis wiring – only the engine-related circuits. For fault codes, the error code and failure code table lists all possible codes with descriptions. If you need to diagnose a no-start because of a sensor failure, the manual tells you which pins to check and what values to expect. It also explains how to handle the controller voltage circuit. That’s enough to isolate most engine electrical problems without guessing.

If you work on these engines, you know the difference between a job that passes the first time and one that leaks oil from day one. The OEM data in this manual eliminates the variables. Download the Factory Manual and get the real specs.