Description

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

You have a Komatsu excavator that won’t track straight, a hydraulic system that’s bleeding down, or an engine that’s losing power. You don’t need a generic overview. You need the Komatsu PC350LC-8, PC300LC-8, PC300-8, PC350-8 Workshop Manual – the same 989-page binder that sits in a dealer’s service bay. I’ve been torquing head bolts for 28 years, and I can tell you: skipping the factory book costs you time, parts, and sometimes a fire.

What This Workshop Manual Covers

Starting with the foreword and safety notices, this book lays out exactly how Komatsu expects you to work. The Table of Contents leads you into 01 Specification – you get dimension drawings, weight tables, and the table of fuel, coolant and lubricants. Important stuff when you’re deciding what hydraulic oil to dump in the tank. Then section 10 hits the structure, function and maintenance of every major system: engine and cooling, power train (including swing circle and final drive), undercarriage, and three full parts of the hydraulic system. That’s where most guys get into trouble – guessing on control valve clearances or PPC valve adjustments.

Testing and Adjusting: Where the Real Work Gets Done

Section 30 is the meat of this manual. Over 100 pages dedicated to testing and adjusting – part 1 covers measuring engine speed, air boost pressure, compression pressure, blow-by, oil pressure, fuel pressure. You’ll find procedures for adjusting valve clearance, bleeding air from the fuel circuit, and testing track shoe tension. Part 2 explains special functions of the machine monitor. Part 3 dives into handling voltage circuits of the engine controller and the PM clinic service. Need the charge pressure? Page 73 gives you the standard value table for engine-related parts. You don’t get that from a YouTube video.

Factory Torque Data You Can Trust

I trust aftermarket manuals about as far as I can throw a final drive. This one includes the standard tightening torque table and a conversion table right in the foreword. Section 20 is the Standard Value Table – separate tables for engine and chassis parts. No guessing on bolt stretch or hydraulic fitting torque. Subtract 10% for lubricated threads? That’s not in here – they give you the dry spec. Period.

Troubleshooting Without the Guessing

Section 40 starts with a failure code table and fuse locations. Then general information on troubleshooting – points to remember, sequence of events, checks before you start. They break it down by failure code display, E-mode electrical system, and hydraulic/mechanical problems. If you’ve ever stared at a blinking monitor code with no clue, this section turns that into a flowchart. For comparison, if you were working on a vehicle with a Manual Transmission, you’d need a different set of factory specs. But for these Komatsu excavators, this is the one.

OEM vs Aftermarket: Why Factory Specs Matter

Any third-party manual that claims to cover the PC300-8 or PC350LC-8 is a gamble. They skip chapters, rephrase torque values, or worse – use generic wiring diagrams. This is an original Komatsu shop manual, printed from the same plates as the dealer version. The safety notices, handling of electric equipment and hydraulic components, and the push-pull coupler procedures are Komatsu’s own. You don’t rewrite safety. You don’t approximate tolerances. Access the factory file and keep it on your tablet in the cab.

Who Needs This Manual?

If you own a PC300LC-8, PC300-8, PC350-8, or PC350LC-8 – from serial number 60001 and up – you need this. Doesn’t matter if you’re a home garage mechanic or running a fleet. The step-by-step repair procedures cover everything from the KOMTRAX terminal system to the hydraulic drift prevention valve. Required tool lists are in every testing section. Safety warnings are bolded. If you’re about to pull a swing motor or adjust the sprocket, you want the factory spec, not a guess. Also, check the related manuals: Komatsu PC350LC-8 PC350HD-8 2011 Workshop Manual, Komatsu PC300LC-8 PC300HD-8 2011 Service Manual, and Komatsu PC350LC-8 Shop Manual for other model years.

FAQ – Common Questions

Does this manual cover the electrical system including the monitor?

Yes – section 10 includes a full electrical system chapter covering engine control, electronic control system, monitor system, sensors, and KOMTRAX terminal. Section 40 adds troubleshooting by failure code and E-mode electrical diagnostics.

How do I measure engine blow-by pressure?

Section 30, Testing and Adjusting Part 1, has a dedicated procedure for measuring blow-by pressure. It tells you the required tool (a manometer), the engine operating temperature, and the acceptable range in inches of water column. Follow the sequence – don’t skip the warm-up step.

What torque values are included?

The foreword includes a standard tightening torque table for common bolt grades and sizes. Section 20 lists specific service values for engine and chassis components – like cylinder head bolts, main bearing caps, and hydraulic fitting nuts.

Is this a PDF or a printed book?

PDF format. You get the full 989-page OEM manual as a digital file, searchable, printable, and viewable on any device. No reprints, no copied pages.

You’ve got a machine that costs more per hour than your labor rate. Spending an afternoon guessing on a hydraulic adjustment or a fuel pressure test? Not smart. Get the Komatsu factory documentation that tells you exactly what the engineers intended. Access the Factory Manual and put real specs on your bench.

For reference, if you ever work on equipment with a Manual Transmission, you’ll want their factory manual too. Different machine, same principle – don’t guess.