Description

Komatsu PC60-6, PC60L-6, PC90-1 Workshop Manual – 451 Pages of Factory Specs

I’ve been turning wrenches since before most of you were born, and I can tell you the difference between a job that goes smooth and one that turns into a three-day headache is the book under your coffee cup. If you’re working on a Komatsu PC60-6, PC60L-6, PC90-1 Workshop Manual, you need the real OEM documentation, not some aftermarket photocopy that guessed at the valve clearances. This is the factory manual – 451 pages of what Komatsu actually prints for their own techs.

Let’s cut the chatter. You’ve got an excavator that won’t swing, a travel motor that’s leaking, or a fuel injection timing issue that’s killing your power. This manual walks you through every system from the engine mount to the EMMAC console. The structure is laid out in four major sections: Structure and Function (Section 10), Testing and Adjusting (Section 20), Disassembly and Assembly (Section 30), and Maintenance Standard (Section 40). That’s the meat and potatoes of any heavy repair.

Engine Mount and Related Parts – What the Manual Covers

Section 10 starts with the engine mount and all the related parts – radiator, oil cooler, P.T.O., and the full power train. You get exploded views of the swing circle, swing machinery, track frame, idler, carrier roller, track roller, and track shoe. Every hydraulic line and component is diagrammed, including the 6-spool and 5-spool control valves, blade pump, swing motor, center swivel joint, travel motor, and the whole valve control stack. Page 10-1 kicks off the structure section, and it’s the kind of detail that keeps you from pulling a part you didn’t need to touch.

Testing and Adjusting Valve Clearance and Fuel Injection Timing

Section 20 is where you’ll spend most of your time. It includes a Table of Judgment Standard Values, a list of required tools, and specific procedures for adjusting valve clearance, measuring compression pressure, testing and adjusting fuel injection timing, and setting the travel of the governor motor lever. You’ll also find steps for testing and adjusting hydraulic pressure in the work equipment, swing, and travel circuits, plus charging pump pressure and PPC valve output. If you’ve ever chased a hydraulic drift issue, the troubleshooting charts in Section 20 will save you hours of dead-end circuit testing.

7 Major Hydraulic Systems Explained

The manual breaks down the hydraulic circuit into seven major subsystems: the main hydraulic pump, blade pump, left and right control valves, blade control valve, swing motor, travel motor, and all the safety/shuttle valves. Each component gets its own subsection with disassembly and assembly steps in Section 30. The hydraulic circuit diagram and the electrical circuit diagram are both included, so you can trace lines without guessing which wire goes where. The PPC valve adjustment procedure alone is worth the price – most aftermarket books skip that step entirely.

Does This Manual Include Wiring Diagrams and Diagnostics?

Yes, and it does it properly. The manual has a full electrical wiring diagram and circuit diagram in Section 10, plus an entire troubleshooting section dedicated to the engine throttle controller system (E mode) and pump controller system (C mode). You get connector positions, connection tables, self-diagnostic functions, and judgment tables. For example, fault codes E-1 through E-11 cover everything from a dead controller to a bad fuel control dial. The C-mode charts handle auto-deceleration, swing brake solenoid issues, and travel speed switching. This is the same diagnostic flow that a Komatsu dealer uses.

Get the Right Torque Specs for Your Komatsu

Torque values appear throughout the Testing and Adjusting section and in the Maintenance Standard. The manual specifies tightening sequences for cylinder head bolts, main bearing caps, and hydraulic fittings. If you rely on a generic chart, you risk stripping threads or cracking a casting. The factory manual gives you the exact numbers – inch‑pounds and foot‑pounds where applicable. Don’t guess. Use the book.

Source Authenticity – OEM vs Aftermarket

I’ll say it straight: aftermarket manuals are a gamble. They reprint outdated information, skip pages, and occasionally give you a torque spec that’s wrong by 20 ft‑lb. This is a genuine Komatsu OEM shop manual, scanned from the original print. It covers serial numbers PC60-6 28001 and up, PC60L-6 8001 and up, and PC90-1 1001 and up. The engine is the 4D95L-1, but you’ll need the separate 95‑series engine manual for bottom-end rebuilds. What’s here is every system that bolts onto that engine: fuel, hydraulic, electrical, and undercarriage.

Related Manuals

• Komatsu WA65-5 WA70-5 WA80-5 2005 Workshop Manual
• Komatsu WH609-1E0 WH613-1E0 WH713-1E0 WH714H-1E0 WH716-1E0 Workshop Manual
• Komatsu PW95R-2 Workshop Manual – 520 Pages of Factory Specs

Does this manual cover the 4D95L-1 engine rebuild?

Yes, it covers the 4D95L-1 engine in full – fuel system, governor, injection timing, and valve adjustments.

How do I troubleshoot the swing brake solenoid staying on?

Go to Section 20, fault code C-4. The manual lists the sequence: check the solenoid valve outlet pressure first (page 20-24), then test the PPC shuttle valve for contamination. If the solenoid itself tests fine, the controller may be faulty – the chart walks you through testing the controller output pins with a multimeter. Don’t skip the connector inspection step; corrosion on the pin 3 connector is a common cause and the manual shows you exactly which connector to check. After you clear the code, verify the swing brake releases by measuring pilot pressure at the swing motor port. The adjustment spec for the brake solenoid is 30–45 psi, and if you see anything under 25 psi, replace the solenoid before you button it up.

If you’ve got a Komatsu PC60-6, PC60L-6, or PC90-1 sitting in your yard, you need this book on your bench. The P.T.O. section alone will save you from pulling a Manual Transmission style unit apart the wrong way. And when you’re bleeding the hydraulic circuit after a pump swap, the sequence in Section 20 is the only safe method I trust – it’s not like bleeding a Manual Transmission in a pickup. Get the real thing. Access the Factory Manual.