Description

Komatsu PC300LC-6, PC300-6, PC350-6, PC350LC-6 2002 Workshop Manual

You’re inside a PC350-6, half the hydraulic lines are off, and you need the charge pressure spec. Grab an aftermarket manual and you’re rolling dice. I’ve watched guys guess torque on head bolts and scrap an entire block. That’s why you want the original 2002 Komatsu PC300LC-6, PC300-6, PC350-6, PC350LC-6 2002 Workshop Manual. This is the 809-page factory binder I kept on my bench at the dealer. No reprints, no copy. Nothing but what Komatsu issued to their own techs.

Standard Tightening Torque – Get It Right or Replace the Parts

Torque specs are not suggestions. The Foreword section in this manual lists standard tightening torque for every fastener grade used on these machines. You’ll see values in foot-pounds and Newton-meters with the thread size and material. One stripped bolt on the swing motor housing costs you a day. Page 20-1? That’s where the testing procedures start. But the torque table is right in the front. Use it.

Fuel, Coolant and Lubricants: The Specs Your Engine Needs

Section 01 GENERAL includes a dedicated table for fuel, coolant, and lubricants. The SAA6D108-2 engine in these PCs requires specific oil viscosity and API classification. Get it wrong and you’ll burn a turbo. This page lists the exact Komatsu part numbers for filters and the capacities for each drain interval. Home garage guys: do not guess on hydraulic oil. The factory says 10W or 30 weight depending on ambient temp. That data is on the spec drawings page.

Does This Manual Cover the Engine Control System?

Yes. Section 10 STRUCTURE AND FUNCTION has a whole subsection on ENGINE CONTROL and ELECTRONIC CONTROL SYSTEM. It covers the governor, pump controller, and the LS-EPC valve. If you’re chasing a stall code or a no-start, the actual electrical wiring diagram in that section shows pin numbers and harness routing. Beginners: do not touch the solenoid valves without the electrical circuit diagram. One crossed wire and you’re buying a controller. This manual has it drawn out.

7 Testing and Adjusting Procedures That Save Your Job

Section 20 TESTING AND ADJUSTING is where this manual earns its keep. There are at least seven major procedures that every tech runs into: measuring compression pressure, adjusting valve clearance, testing fuel injection timing, checking blow-by pressure, setting alternator belt tension, bleeding the hydraulic circuit, and releasing remaining pressure from the hydraulic circuit. Each one includes tool lists and step order. The troubleshooting charts cover service codes from N-1 to E-1. You get the judgment table for the governor control system and the sequence of events for diagnosing communication abnormalities.

Source Authenticity: OEM Factory Print vs Aftermarket Copies

This is not a third-party scan. It’s the original PDF of SEBM014307, printed in Japan in 2002. The table of contents matches the exact pagination used by Komatsu. Aftermarket manuals often skip the hoisting instructions, the push-pull coupler disassembly method, and the coating materials list. This one has them. The wiring diagrams are not redrawn – they’re scanned from the factory litho. If you want something to trust on a $200,000 machine, this is it. For earlier models, check the Komatsu PC300LC-6 PC300HD-6 1996 Service Manual or the Komatsu PC300LC-6 PC300HD-6 1999 Workshop Manual. Also see the Komatsu PC300LC-6 PC300-6 PC350-6 PC350LC-6 2002 Workshop Manual for the same series.

Who Needs This 809-Page Manual?

If you own a PC300-6, PC300LC-6, PC350-6, or PC350LC-6 – and you plan to do more than oil changes – buy this. Beginners who want to learn hydraulic troubleshooting should start here. Professionals who need to quickly find the standard value table for electrical parts will save billable hours. The manual even covers the air conditioner and front window auto pull-up system. That’s right – the glass mechanism is in section 10. The hydraulic circuit diagram uses a closed-center load sensing (CLSS) system, different from a standard Manual Transmission setup. And the travel motor section references a Manual Transmission for the park brake, so you’ll understand the linkage.

Does this manual include torque specs for the final drive?

Yes, in the Foreword Standard Tightening Torque table.

Can I use this manual for a PC400 model?

No. This manual is specific to the PC300/350-6 series with SAA6D108-2 engine and CLSS hydraulics. Serial numbers are listed on the cover: PC300-6 33001 and up, PC300LC-6 33001 and up, PC350-6 12001 and up, PC350LC-6 12001 and up. Using it on a different model means wrong valve clearances, incorrect pump pressures, and component damage. Aftermarket manuals sold as “universal” are a fast track to broken parts. Stick to the OEM document that matches your machine’s serial number.

Stop burning time on incomplete data. Get the 2002 Komatsu PC300/350 series factory manual. Access the Factory Manual from AutoRepairManuals.