Komatsu PC340, PC340LC, PC340NLC Workshop Manual – 748 Pages of Factory Specs

If you’ve been burned by aftermarket manuals that list torque specs off by 10%, you know the pain. I’ve had to retap holes because some third-party book told a kid to tighten main bearing caps to 150 ft-lbs when Komatsu says 135. That’s a scrap block. This Komatsu PC340, PC340LC, PC340NLC Workshop Manual is the real thing – OEM factory print, 748 pages, direct from the engineers who designed the machine.

Safety Notice: Read This Before You Touch the Machine

Komatsu’s safety section is not filler. It covers general precautions – wear safety glasses when grinding, hang “UNDER REPAIR” signs on controls, never work alone under a raised boom. The manual even tells you what decals to look for on the machine. I’ve seen guys skip this and end up with broken fingers from a released swing brake. Don’t be that guy. Read it.

Standard Tightening Torque – Where the Real Numbers Live

Page 40-1 of the MAINTENANCE STANDARD section gives you the exact tightening torque for every fastener on this machine – not some generic table from 1985. Bolts, nuts, pipe fittings, flange bolts. The manual uses Imperial units throughout, so you won’t be converting metric fractions while holding a wrench. Aftermarket manuals often mix up coarse and fine thread torque; this one doesn’t.

Testing and Adjusting – Why You Need the Factory Procedure

Section 20 (TESTING AND ADJUSTING) starts on page 20-1 and goes deep. You get standard value tables for engine-related parts, chassis parts, and electrical parts. Want to check compression pressure? There’s a procedure. Need to adjust valve clearance on the SAA6D108E-2 engine? It’s in there. The manual includes blow-by pressure measurement, governor motor lever stroke, and LS valve output pressure. Every test references a specific tool – you’ll know exactly which gauge to buy.

For example, the electrical section covers the machine monitor system and electronic control system. If you’re chasing a service code like E-308 (fuel control dial input abnormality), the troubleshooting chart walks you through exactly which connector pins to check. No guesswork.

Structure and Function: Understanding the Hydraulic Circuit

You cannot fix a hydraulic drift issue without knowing how the CLSS (Closed-center Load Sensing System) works. Section 10 breaks down the hydraulic pump, control valve, swing motor, travel motor, PPC valves, and the LS-EPC valve. The manual includes actual hydraulic circuit diagrams and piping drawings – not a cartoon. When I’m diagnosing a slow swing, I flip to the CLSS chapter and compare pressures at the self-reducing pressure valve. That data is only in the OEM book.

Why OEM Documentation Beats Aftermarket

Aftermarket manuals copy from copies. This one is a direct scan of the Komatsu SHOP MANUAL for PC340-6K, PC340LC-6K, and PC340NLC-6K machines (serial numbers K32001 and up). It covers the exact engine – SAA6D108E-2. You won’t find that level of specificity in a Haynes or Chilton. If you’re working on a Komatsu excavator, you need the factory electrical wiring diagram and the actual electric circuit diagram (included).

Related manuals you might need: Komatsu WA65-5 WA70-5 WA80-5 2005 Workshop Manual for wheel loaders, Komatsu WH609-1E0 WH613-1E0 WH713-1E0 WH714H-1E0 WH716-1E0 Workshop Manual for wheel harvesters, or Komatsu PW95R-2 Workshop Manual – 520 Pages of Factory Specs for the PW series.

For general transmission knowledge, see the Wikipedia article on Manual Transmission if you’re comparing powertrain types. Another external source: Manual Transmission (same reference).

Does this manual include the engine section for the SAA6D108E-2?

Yes. The manual covers engine-related parts in STRUCTURE AND FUNCTION, and the TESTING AND ADJUSTING section includes standard value tables for engine parts, compression pressure measurement, valve clearance adjustment, and injection timing. For a full engine rebuild, you might need the separate Komatsu engine shop manual, but this covers everything you need for diagnostics and in-chassis work.

How many pages are there?

748 pages.

Don’t waste hours chasing bad aftermarket data. Download the Factory Manual and get the right torque specs, wiring diagrams, and troubleshooting procedures the first time.