Description

Komatsu PC210-6K, PC210LC-6K, PC240LC-6K, PC240NLC-6K Workshop Manual – 665 Pages of Factory Specs

If you’re turning wrenches on a Komatsu PC210-6K, PC210LC-6K, PC240LC-6K, PC240NLC-6K and you don’t have the OEM workshop manual on the bench, you’re gambling. I’ve torqued more head bolts than most techs have hot meals, and I can tell you the difference between a job that goes smooth and one that gets flagged hours overtime is the spec source. This 665-page factory manual is the same binder Komatsu shipped to dealers. No aftermarket reprint, no condensed rewrite. Every torque value, clearance spec, and hydraulic pressure comes straight from the engineers who built the machine.

Aftermarket manuals? I’ve seen them list the wrong valve clearance for the SA6D102E-1 engine in the PC240LC-6K. That gets you a burned valve or a head gasket failure inside 50 hours. This Komatsu workshop manual gives you the correct adjustment procedure from section 20 – Testing and Adjusting. You get the standard value table for engine, chassis, and electrical parts all in one place. Page references are accurate because the pagination is factory-original.

Structure and Function: Engine Related Parts and Hydraulic Pump

Section 10 of the manual covers structure and function for every major component. You get breakout diagrams of the radiator/oil cooler, power train, final drive, swing circle, swing machinery, track frame and recoil spring, track shoe, and dual hydraulic tank sections. The hydraulic pump section walks through the CLSS system – the closed-center load-sensing setup that Komatsu used on these models. If you’re diagnosing low swing speed or travel drift, you need the pump control valve routing from this section. The manual also documents the safety-suction valve for the service valve, the self-reducing pressure valve, and the EPC solenoid valve circuits. Understanding the sequence – how PPC pressure feeds the HCU – saves you from chasing ghosts.

Testing and Adjusting: Valve Clearance and Fuel Injection Timing

Section 20 is where the real work happens. The manual gives you the standard value table for the engine – specific to the PC210-6K and PC240-6K chassis. You’ll find the procedure for measuring engine speed, exhaust gas color, adjusting valve clearance (that’s the one I keep coming back to for the S6D102E-1 engines), measuring compression pressure and blow-by pressure. Testing and adjusting fuel injection timing is covered step-by-step with the correct flywheel marks and dial indicator setup. For the hydraulic side, you get procedures for testing PC valve output pressure (servo piston input pressure), LS valve output pressure (servo piston input pressure and LS differential pressure), and control circuit oil pressure. The graph of PPC pressure against HCU circuit oil flow is in this section – use it for setting the flow control system.

Does This Manual Cover the Electrical System?

Yes. Pages 20-1 through the troubleshooting sections cover the full electronic control system. You’ll find connector types and mounting locations, a connection table for connector pin numbers, explanation of the control mechanism for the electrical system, and the monitor panel display method and special functions. The troubleshooting section includes service code tables, E mode (engine throttle/pump controller) troubleshooting with detailed faults like E308 (fuel control dial input abnormality), E317 (motor drive disconnection), E318 (motor drive short circuit), E306 (feedback potentiometer abnormality), E315 (battery relay output short circuit), and E316 (motor step-out). S mode covers engine system faults such as poor start, engine does not start, and engine does not pick up smoothly. All wiring diagrams are Komatsu-original, not redrawn by a third party.

Why OEM Factory Specs Matter for Komatsu Equipment

I’ve had guys tell me they can save money with a generic manual. Let me tell you what that costs. On a PC210LC-6K, if you miss the correct LS differential pressure by 50 psi because the aftermarket manual used data from a different pump, you’ll get bucket drift that wastes fuel and heats the oil. The factory Komatsu manual gives you the exact values from the standard value table for the PC240NLC-6K, not some averaged number. The hydraulic tank section shows two – yes, two – separate hydraulic tank sub-sections (pages 10-1 to 10-?) because the PC240 models have a different reservoir configuration. Aftermarket won’t catch that. If you need the complete engine overhaul spec, this manual covers the 102 series engine (S6D102E-1 and SA6D102E-1) and references the separate 102 Engine Service Manual when needed.

3 Critical Procedures You Can Stop Guessing On

First: valve clearance adjustment. The manual tells you the cold clearance for intake and exhaust on the S6D102E-1. No guesswork. Second: hydraulic pressure testing for the work equipment, swing, and travel circuit. You get the order to release remaining pressure in the hydraulic circuit before cracking any line (a step too many skip, and then you get a face full of hot oil). Third: track shoe tension adjustment. The procedure includes measuring the sag and the correct grease pressure. Use a grease gun with a gauge, not just a pump until it stops.

Related manuals you should also have on the shelf: Komatsu PC210 PC240 1997 Workshop Manual – OEM Factory Spec for the earlier 6D series engines, and the Komatsu PC210, PC210LC-6K, PC240LC-6K, PC240NLC-6K Operators Manual for daily operating limits. If you work on wheel loaders too, grab the Komatsu WA65-5 WA70-5 WA80-5 2005 Workshop Manual – similar hydraulic principles. For external reference on transmission fundamentals, see Manual Transmission general theory. And for clutch and gear basics, Manual Transmission is the standard.

Get the factory manual.

FAQ – Komatsu PC210-6K Series Workshop Manual

What serial numbers does this manual cover?

Serial numbers K32001 and up for both the PC210-6K/PC210LC-6K and PC240LC-6K/PC240NLC-6K.

Does this manual include torque specs for the valve clearance adjustment?

Yes. Section 20 gives the valve clearance standard values in both cold and hot conditions for the S6D102E-1 and SA6D102E-1 engines. It also lists the tightening torque for the adjusting screw locknut – something aftermarket manuals often omit, leading to a valve that shifts and burns the seat. I’ve seen it happen. Use the factory number.

Can I use this manual for the PC240NLC-6K?

Yes, the PC240NLC-6K is one of the four models covered. The manual includes specific standard value tables for PC240-6K chassis and engine.

Is the hydraulic pump section detailed enough for a full rebuild?

Section 10 covers structure and function of the pump, including the CLSS control valve and self-reducing pressure valve. Section 30 (Disassembly and Assembly) provides the procedures, but you’ll need the separate standard parts manual for individual piston and plate clearances. This workshop manual gives you the testing specs and the correct shim selection for the servo piston.

Access the Factory Manual and keep it in the toolbox. That’s the last time you’ll need to ask anyone for a torque spec.