Description

Komatsu PC300, PC300LC, PC350, PC350LC Workshop Manual

You have a Komatsu PC300, PC300LC, PC350, PC350LC Workshop Manual in your hands — 989 pages of factory OEM documentation that came off the Komatsu press, not a third-party copy. I have been turning wrenches since before some of you were born, and I can tell you the difference between a real Komatsu shop manual and a reprint is the difference between a head gasket that seals and one that leaks at 500 hours. This is the real thing: serial numbers PC300-60001 and up, PC300LC-60001 and up, PC350-60001 and up, PC350LC-60001 and up. If your machine falls in that range, this book matches your iron.

Engine Overhaul and Cooling System Data

Chapter 10 — Structure, Function and Maintenance Standard — breaks down the engine and cooling system, including radiator, oil cooler, and aftercooler. You get dimension drawings for the Komatsu SAA6D114E-3 engine, plus standard torque values for every fastener on that block. Need the charge pressure? Page 73 (Testing and Adjusting, Part 1) spells out exactly how to measure air boost pressure and compression pressure with the correct tools. No guesswork about which gauge fits the test port — it lists the tool part numbers.

Hydraulic System: Three Parts, One Manual

Hydraulic systems on these excavators are split into three separate sections in the manual: Part 1 (pump, tank, filter), Part 2 (control valve, CLSS, merge-divider valve, drift prevention valve), Part 3 (PPC valve, solenoid valve, accumulator, travel motor, swing motor, cylinders). Each valve has a function-and-operation description, exploded views, and disassembly steps. The CLSS (Closed-center Load Sensing System) explanation alone is worth the price if you have ever chased a pilot-pressure issue on a PC350LC.

7 Systems Covered Under One Cover

The table of contents lists seven major system groups: engine and cooling, power train (swing circle, final drive, sprocket), undercarriage and frame (track frame, idlers, rollers), hydraulic (three parts), work equipment (bucket linkage dimensions), cab and air conditioner, and electrical (engine control, monitor, KOMTRAX terminal). Each section includes maintenance standards with wear limits and clearances. No aftermarket manual covers KOMTRAX terminal diagnostics — this one does, in the electrical system chapter.

Torque Specs and Fluid Capacities

Section 01 — Specification — includes a table of fuel, coolant, and lubricants with capacities in Imperial units (gallons, quarts). The standard tightening torque table in the foreword covers all bolt grades and sizes. I have used it to torque final drive mounting bolts and swing circle bolts on a PC300LC. The values matched the fasteners on the machine, not some generic chart. You will also find weight tables for each model — useful for transport and lift planning.

Who Needs This Manual and Why

If you own a PC300, PC300LC, PC350, or PC350LC and do your own maintenance, this manual saves you from calling the dealer every time a solenoid valve fails or a track shoe tension needs checking. Home-garage guys: the foreword section explains how to read the electric wire code and handle connectors — wiring diagrams are actual Komatsu schematics, not redrawn aftermarket approximations. I have seen too many burned-up ECUs from wire-pin misidentification in third-party books. This one prevents that.

Source Validity: OEM vs. Aftermarket

This is an original Komatsu shop manual, not a scanned reprint with faded pages. The file name ends with “SEN01985-03” — that is the official Komatsu Form Number. Aftermarket documentation often omits the standard service value tables (Section 20) or the testing procedures for blow-by pressure and fuel return rate. This manual includes both. I trust factory specs because I have checked them against actual Komatsu service bulletins. Nothing else.

Frequently Asked Questions

Does this manual cover the PC350LC-8 with the SAA6D114E-3 engine?

Yes. The manual covers PC300-8, PC300LC-8, PC350-8, and PC350LC-8 from serial 60001 and up. Engine specs and testing procedures for the SAA6D114E-3 are in Testing and Adjusting, Part 1.

Can I use this PDF on a tablet in the shop?

Yes, the PDF is searchable and bookmarked. I keep a copy on a waterproof tablet inside the excavator cab. The bookmarks match the chapter structure so you can jump from “Testing and Adjusting, Part 2” to “Special Functions of Machine Monitor” without scrolling through 900 pages. I have done it myself on a PC350LC with a hydraulic leak — pulled up the drift prevention valve section in under 30 seconds.

Access the factory manual. Print the pages you need for the job. Keep the PDF on your work device. This is the same document Komatsu dealerships use — nothing added, nothing stripped. If you want to rebuild a swing motor or adjust valve clearance without second-guessing the torque value, this is the only source you should trust.

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