Komatsu PC800-8, PC800LC-8, PC800SE-8, PC850-8, PC850SE-8 Workshop Manual – 1129 Pages Factory Specs

Description

You’ve been there. A customer’s PC800-8 is down, the swing motor is leaking, and the only numbers you have are from a third-party PDF that has more typos than torque values. That mistake costs a rebuild. I’ve been wrenching on heavy equipment for 28 years, and I can tell you: the difference between a factory manual and aftermarket junk is the difference between a job that stays fixed and a callback that eats your weekend. This Komatsu PC800-8, PC800LC-8, PC800SE-8, PC850-8, PC850SE-8 Workshop Manual is the exact binder that Komatsu techs use. 1129 pages. No reprints. No editing errors.

Engine and Cooling System: Factory Coupling Lubrication Procedure

Flip to the section on the engine and cooling system. You’ll find the coupling lubrication system outlined with oil types, intervals, and the exact fitting for the grease gun. Page 1 of the PDF shows serial number ranges: PC800-8 50001 and up, PC800LC-8 50001 and up, PC850-8 10001 and up. That means this manual matches your machine. The radiator and oil cooler chapter gives core dimensions and cleaning specs – not the generic “flush with water” garbage you get elsewhere. If the machine runs hot, that section saves you from guessing which cooler circuit is clogged.

Why 1129 Pages?

Because Komatsu engineers didn’t cut corners. The manual is divided into nine major sections: 00 Index and foreword, 01 Specification, 10 Structure/function/maintenance standard (which alone has sub-sections for engine cooling, power train, undercarriage, hydraulic system Parts 1 and 2, work equipment, cab, and electrical system), 20 Standard value table, 30 Testing and adjusting (five parts), and 40 Troubleshooting. Each chapter contains drawings, hose routing diagrams, and factory wear limits. For a guy who torques head bolts for a living, that density means you don’t stop mid-job to chase a spec.

Testing and Adjusting: Track Shoe Tension

You need to adjust track tension on a PC850-8? The manual walks you through the procedure with the exact tension gauge tool (part number listed) and the pressure range. No vague “tighten until it feels right.” There’s a test for swing circle bearing clearance, main pump control pressure, and PPC valve output pressure. On page 3, the machine model list confirms coverage for PC800LC-8 and PC800SE-8 as well. If you’re working on a PC850SE-8, same specs apply. That’s what a true series manual does.

Hydraulic System, Part 2: L.H. 5-Spool Control Valve

Hydraulic headaches – stuck spools, leaking seals, drifting boom – all come down to having the right disassembly sequence. The manual dedicates a full chapter to the L.H. 5-spool control valve and the R.H. 4-spool control valve. It shows the bolt tightening pattern for the valve body. It lists the O-ring sizes. It even covers the quick return valve and the center swivel joint. For the travel motor and swing motor, the hydraulic schematics are factory-accurate. You can cross-reference with the test procedures in section 30. That’s not fluff; that’s a working document.

What the Standard Service Value Table Contains

Section 20 is a single table – standard service values for engine and chassis. Valve clearance, compression pressure, blow-by pressure, oil pressure, and fuel pressure. All in imperial units. The engine section alone gives you measurements for intake boost pressure and EGR valve drive pressure. If you’re troubleshooting a low-power complaint, you start here. No need to flip through ten pages of text; it’s a one-page reference if you know where to look. For a DIYer in a home garage, this table is the quickest way to confirm whether your PC800-8 is within spec or needs a teardown. For a professional, it’s the sanity check before writing a repair quote.

Source Validity: OEM vs. Aftermarket Documentation

I don’t trust aftermarket manuals. Period. They often copy from a different model year or omit safety warnings. This Workshop Manual comes from the original Komatsu file – SEN00373-12. The safety notice in the foreword covers handling of electric equipment and hydraulic components, plus precautions for disassembling push-pull type couplers. The standard tightening torque table provides bolt sizes from M6 to M30. Aftermarket books will give you a generic table; this one is specific to the machine’s bolted joints. If you want to avoid snapping a bolt in the final drive, use the factory spec.

FAQ

Does this manual cover the PC800LC-8 and PC850SE-8?

Yes. The manual covers PC800-8, PC800LC-8, PC800SE-8, PC850-8, and PC850SE-8. The serial number ranges are listed on page 1.

What torque values are included?

The standard tightening torque table in the foreword lists values for bolts from M6 to M30, plus special fasteners like hydraulic fittings. The test sections include specific torques for engine mounts, swing motor, and track adjusters. That data is OEM-verified.

Can I use this for the electrical system troubleshooting?

Yes. Section 10 includes a full electrical system chapter covering engine control, monitor system, sensors, and KOMTRAX. The troubleshooting section (40) has failure code tables and fuse locations. You’ll find wiring diagrams referenced in the structure chapters.

How many pages and what format?

1129 pages in PDF format. Each chapter is bookmarked. You can print individual sections for the workbench.

Look, I don’t care if you’re a new guy in a home garage or a lead tech in a 6-bay shop like mine – if you’re working on a Komatsu PC800-8, PC800LC-8, PC800SE-8, PC850-8, or PC850SE-8, get the real book. The factory manual is the only source I trust when I’m staking my reputation on a repair. That’s why I keep a copy on the bench next to my torque wrench. You can too. Access the Factory Manual here. For related documentation, check the KOMATSU PC800-8 PC800LC-8 Operation & Maintenance Manual”>Operation & Maintenance Manual, the Komatsu PC800-8 PC850-8 Field Assembly Instruction”>Field Assembly Instruction, and the Komatsu PC800-8 Series Workshop Manual – 1129 Pages Factory Specs”>full workshop manual listing. External references: if you need a refresher on gearbox principles, a Manual Transmission”>Manual Transmission theory guide can help; also see Manual Transmission”>this transmission overview.