Description

Komatsu PC340LC-7K, 340NLC-7K 2002 Workshop Manual

If you’re turning wrenches on a Komatsu PC340LC-7K or 340NLC-7K, you already know the aftermarket manuals are a gamble. I’ve seen guys pull a spec from a third-party PDF and watch a swing motor bind up because the clearances were wrong. That’s time, money, and a safety hazard. This is the factory Workshop Manual from 2002, 630 pages, printed by Komatsu themselves. It covers serial numbers K40001 and up, and it’s the same book the dealer techs use. No condensed versions – the full structure, function, testing, and disassembly procedures.

Specs and Dimensions – Section 01

Section 01 gives you the weight table, working ranges, and the exact fuel, coolant, and lubricant capacities. Need to know how much hydraulic oil the tank holds? It’s on the specification page. But the real value here is the standard value tables in section 20-001. Those tables list acceptable wear limits for engine parts and chassis components. I’ve used them to decide whether a track roller is worth rebuilding or needs replacement. The service limits are derived from Komatsu’s own testing – not guesswork.

Does This Manual Cover the Engine?

Yes. The PC340LC-7K mounts the SAA6D114E engine. The manual references the 114 Series Engine Shop Manual for full tear-down, but this book includes everything you need for in-chassis work: valve clearance adjustment, compression pressure measurement, blow-by pressure check, and fuel injection timing. See page 20-101 for the engine RPM inspection procedure. That section also covers the governor motor and the electronic control system. If you’re replacing an injector or adjusting the pump, you want the factory fuel timing data – not a generic chart.

Hydraulic Circuit Testing: Section 20

This is where the manual earns its keep. Section 20-101 details inspection and adjustment of hydraulic oil pressure in the work equipment swing and travel circuits. You’ll find procedures for the PC control circuit oil pressure and the LS control circuit oil pressure. If your machine is sluggish or drifting, the step-by-step pressure measurements will pinpoint whether the problem is in the main relief valve, the variable pressure compensation valve, or the pump. There’s also a procedure for releasing remaining pressure in the hydraulic circuit – don’t skip that before cracking a line. The CLSS (Closed Loop Sensing System) outline in section 10 explains how the LS valve and PC valve interact. I’ve seen guys swap pumps needlessly because they didn’t understand that the pump output is limited by the LS pressure. This manual will save you that headache.

Troubleshooting Electrical Systems

Section 20-201 covers the connector location chart and electrical circuit diagrams by system. There’s a connection table for connector pin numbers. If you’re chasing an intermittent error code on the multi-monitor panel, the troubleshooting table in section 20-301 gives a systematic sequence: what to check first, what the normal readings should be, and what components to test. The manual also includes a special function of the multi-monitor panel – you can use it to read sensor values without a scan tool. That alone is worth the price of the manual. Manual Transmission – that external link goes to a Wikipedia article on transmissions, but the travel motor section here uses a similar hydraulic-mechanical principle. For the travel motor overhaul, see section 10 for the travel junction valve and shuttle valve assemblies.

Disassembly and Assembly Procedures

Section 30 is the meat for anyone pulling a hydraulic cylinder or the final drive. The manual gives you removal and installation sequences with torque values for every fastener. Note: the manual states the standard values are for new machines – after wear, you adjust based on service limits. That’s an important distinction. If you’re rebuilding a boom cylinder, the manual lists the disassembly steps for the boom cylinder, arm cylinder, and bucket cylinder. The air conditioner piping section is also here, so you don’t accidentally kink a line when removing the cab. Komatsu PC340LC-7K PC340NLC-7K 2002 Workshop Manual – that’s the same manual, but it’s a good bookmark for the product page. For the operator’s manual with daily checks, see KOMATSU PC340LC-7K, PC340NLC-7K Operation & Main and the Komatsu PC340LC-7K / PC340NLC-7K Operation Manual for starting procedures and capacities. Those are separate documents but they pair with this workshop manual.

Source Authenticity – Factory vs Aftermarket

Every page in this manual was printed by Komatsu in 2002. The revision list at the front shows which pages have been updated – you’re getting the version that shipped from the factory. Aftermarket manuals often copy the old data or skip the standard value tables. This manual has the exact fuel injection timing specs for the SAA6D114E, not a generic range. If you’re a shop owner, having the OEM document on hand reduces liability. When a customer asks why you set the track tension to a specific value, you show them the manual. No debate. Manual Transmission – another external link for reference, but the final drive section here is hydraulic, not manual. The point is, trust the source.

FAQ

Does this manual cover the SAA6D114E engine?

Yes, the 114 Series engine is covered in the context of in-chassis adjustments and testing.

How many pages does it have?

630 pages total, including specs, hydraulic diagrams, electrical schematics, and disassembly steps.

Are the wiring diagrams complete with pin numbers?

Section 20-201 includes connector location charts, circuit diagrams by system, and a connection table for connector pin numbers. The troubleshooting section 20-301 uses these to guide you through electrical faults step by step. You also get the special functions of the multi-monitor panel for reading diagnostic codes without a proprietary scanner – that’s a time-saver on the job.

What about torque values for the final drive?

Torque values are given in the standard value tables and in the disassembly section. The manual does not print a generic list – each fastener is specified in context. You’ll find them for engine mounts, hydraulic fittings, and track shoe bolts.

If you’re doing anything beyond an oil change on a Komatsu PC340LC-7K or 340NLC-7K, get the factory data. Don’t rely on a third-party reprint that might have skipped a page. Access the Factory Manual today and keep it on your tablet or print it for the shop. It will pay for itself the first time you avoid a misdiagnosed hydraulic problem.