Description

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

If you have a Komatsu PC300-8 or PC350-8 series machine on your lift, you need the actual factory book. Not a generic reprint. Not a third-party summary. This 1025-page workshop manual is the same one Komatsu dealers use. I have seen too many guys trust an aftermarket torque chart and end up with a cracked block. That does not happen when you open the factory Standard Value Table. The Komatsu factory torque specs for head bolts on the SAA6D114E engine are in that table, and they are specific to the serial number range starting at 60001.

I run a six-bay shop. When a PC350LC-8 comes in with a hydraulic drift issue, I go straight to section 10 (Structure, function and maintenance standard) and then to section 30 (Testing and adjusting). That is where the real work happens. The manual does not assume you know the charge pressure. It gives you the procedure, the tool list, and the acceptable range. No guesswork.

Standard Value Table: Why You Need Page 20

Section 20 is the Standard value table. This is where you find the cold clearance for the valve train, the hydraulic pump flow rate, and the swing motor pressure. Page 20 lists the service standard values for every major component. If you are rebuilding a final drive, you need those numbers. The manual includes the factory tolerances and the wear limits. Do not rely on a memory from five years ago. Open the book.

Does This Manual Cover the Hydraulic System?

Yes, the hydraulic system gets three separate sections under 10: Part 1, Part 2, and Part 3. That is roughly 200 pages on pumps, control valves, swing and travel motors, and the main relief pressures. The manual also covers the PC and LS valve adjustment. If your PC300LC-8 is slow on the swing, section 10 will walk you through the pilot pressure check at the pedal valve. The required tool list includes a 6 MPa gauge and a tee fitting. It is all in there.

3 Systems Explained in the Structure Section

Section 10 breaks down the engine and cooling system, the power train, and the undercarriage. It covers the track tension adjustment, the carrier roller clearance, and the final drive disassembly. The manual gives you the OEM torque sequence for the sprocket hub bolts. I have seen broken hubs from someone using a cross pattern instead of the factory star pattern. The manual shows the exact tightening procedure with the torque in ft-lbs.

Get the Right Torque Specs from the Factory

Torque values are scattered through the manual, but the central reference is section 20. The Standard service value table (SEN02624-02) lists torque for cylinder head bolts, main bearing caps, and connecting rods. For the Komatsu SAA6D114E, the head bolt torque is in two stages plus a 90-degree turn. The manual also includes the angle specification in degrees. Do not use a generic chart. Use the factory numbers. I cannot stress this enough.

Testing and Adjusting: What the Manual Includes

Section 30 is split into three parts: Testing and adjusting Part 1, Part 2, and Part 3. This covers everything from fuel system pressure testing to swing parking brake release pressure. For the PC350-8, you can find the pilot pressure adjustment procedure for the PPC valve. The manual includes a step-by-step procedure for checking the travel motor relief valve setting. It tells you which port to attach the gauge and what the spec should be at low idle. That is the kind of detail that saves you a return trip.

Need to troubleshoot an E-mode fault? Section 40 (Troubleshooting) gives you the failure code table and the fuse locations. It covers troubleshooting by failure code for the electrical system. The manual lists the possible causes and the test points. It is not a vague list; it is a diagnostic tree with pin numbers and expected voltages.

The manual is a genuine OEM document. It was produced by Komatsu for their engineers and dealer techs. The file name itself—KOMATSU_PC300-8-PC300LC-8-PC350-8-PC350LC-8_Workshop_Manual_en—confirms it. No one else has the original. The only source I trust for this kind of work is AutoRepairManuals because they archive the factory PDFs as-is. No OCR errors introduced. No missing pages. You can compare this to aftermarket manuals that skip the torque angle steps; they get people hurt.

For related models, check the Komatsu PC350LC-8 PC350HD-8 2011 Workshop Manual or the Komatsu PC300LC-8 PC300HD-8 2011 Service Manual. There is also a Komatsu PC350LC-8 Shop Manual for the earlier series. External reference: learn about Manual Transmission basics or see Manual Transmission history.

Frequently Asked Questions

What serial numbers does this manual cover?

PC300-8 serial 60001 and up, PC300LC-8 60001 and up, PC350-8 60001 and up, PC350LC-8 60001 and up.

Does it include wiring diagrams?

Yes, the electrical system section (part of section 10 and section 40) contains full wiring diagrams and connector pinouts. The manual covers the E-mode troubleshooting with fuse locations and failure code tables. You can trace a short circuit using the provided schematics.

Is this the official Komatsu manual?

Yes. It is the factory shop manual with publication number SEN01983-07. No aftermarket reprints.

How many pages?

1025 pages.

Access the Factory Manual from AutoRepairManuals. You get the exact PDF that Komatsu dealers use. No missing sections. No blurred pages. The 1025 pages cover everything from the index to the troubleshooting charts. If you work on these machines, this is the only book you need.