Description

Komatsu PC350LC-8, PC300LC-8, PC300-8, PC350-8 Workshop Manual

If you’ve ever had a hydraulic pump fail because a third-party manual gave you the wrong clearance spec, you already know the value of a factory Komatsu PC350LC-8, PC300LC-8, PC300-8, PC350-8 Workshop Manual. This is the exact document Komatsu dealerships use. 1035 pages of verified data, not a reprint.

Skip the aftermarket PDFs that omit the standard torque table or show a generic wiring diagram that doesn’t match your machine’s serial number. This book covers serial numbers PC300-60001, PC300LC-60001, PC350-60001, and PC350LC-60001 and up – which means it matches your specific excavator.

Engine and Cooling System: Factory Specs for PC300-8 and PC350-8

Section 10 opens with the engine-related parts and cooling system. You get exploded views of the radiator, oil cooler, and aftercooler. The manual tells you how to test air boost pressure (page 1 of the testing section) and adjust valve clearance. No guesswork – the standard value table in section 20 lists every measurement you need for the engine and chassis.

I’ve seen guys use Chilton-style generic torque charts on final drive bolts and wreck the threads. This manual gives you the exact N·m values for every fastener, from the exhaust manifold to the swing circle retaining bolts. That’s the difference between a 5,000-hour rebuild and a 500-hour failure.

Hydraulic System, Part 2: Control Valve and CLSS Explained

Hydraulic system coverage is split into three parts. Part 2 focuses on the control valve, CLSS (Closed-center Load Sensing System), and the merge-divider valve. If your PC350LC-8 is drifting down under load or the attachment circuit selector valve sticks, this section shows you the internal spool geometry and the correct way to bench-test each valve.

The manual also covers the hydraulic drift prevention valve. A lot of guys skip that and end up replacing cylinders that aren’t worn. The factory procedure tells you how to isolate the drift to the valve or the cylinder. Follow that and you save a $1,200 part.

Testing and Adjusting, Part 1: Tools and Procedures

Section 30 is where the real work happens. It starts with a list of special tools – part numbers, not generic equivalents. You’ll see sketches of the tools. Then it walks through testing engine speed, blow-by pressure, fuel return rate, and compression pressure. The sequence for bleeding air from the fuel circuit is step-by-step, with warnings about high-pressure injection lines. Do not skip the safety notice on page 3 of the foreword – it covers handling high-pressure fuel and hydraulic accumulators.

Testing hydraulic oil pressure in the work equipment circuit? The manual tells you which port to tap and what pressure to expect at low and high idle. That’s the kind of data you cannot get from a reprint. If you’re a field technician, this section pays for itself on the first job.

Troubleshooting by Failure Code: Section 40 Breakdown

Section 40 lists every failure code the ECU can throw. Fuse locations are diagrammed. The troubleshooting logic is presented in a sequence table: symptom → possible cause → inspection procedure. For electrical system issues, there’s an E-mode troubleshooting tree. If the monitor shows a code for the KOMTRAX system, the manual gives you the diagnostic steps without requiring a dealer laptop.

One thing I appreciate: the manual includes a diode inspection procedure. Most aftermarket guides leave that out. You need to know how to check the diodes in the alternator and controller circuits without frying the meter.

Standard Value Tables: When You Need Actual Numbers

Section 20 is the quick-reference section every mechanic ends up tabbing. You get standard service values for engine-related parts – everything from piston ring end gap to valve stem clearance. Chassis-related parts follow: swing circle clearance, final drive bearing preload, track tension adjustment. These tables are what separate a repair from a hack job. Use them.

The manual also includes a conversion table and a standard tightening torque table in the foreword. If you’re working on a PC300LC-8 and need to torque the track roller flange bolts, you look it up. Don’t guess.

FAQ

Does this manual cover the KOMTRAX system?

Yes, the electrical system section includes the KOMTRAX system, sensor locations, and monitor diagnostics.

Can I use this manual for a PC300-8 with a different serial number range?

This edition covers serial numbers starting at 60001 for all four models. If your machine has a lower serial number, you need an earlier revision. Check the manual’s foreword for the exact serial number breakdown – page 3 lists PC300-8 60001 and up, PC300LC-8 60001 and up, PC350-8 60001 and up, PC350LC-8 60001 and up. If your machine falls outside that, contact Komatsu for the correct publication number. Using the wrong manual can lead to mismatched wiring diagrams and torque values that don’t apply.

Related Manuals:

• Komatsu PC350LC-8 PC350HD-8 2011 Workshop Manual
• Komatsu PC300LC-8 PC300HD-8 2011 Service Manual
• Komatsu PC350LC-8 Shop Manual

External references: For general transmission theory, see Manual Transmission. The final drive section in this manual aligns with Manual Transmission principles.

Stop burning billable hours on bad information. Access the Factory Manual and get the real specs – torque tables, failure codes, hydraulic pressures – all verified by Komatsu’s engineers. Your machine will thank you.