Description

Komatsu PC100-6, PC100L-6, PC120-6, PC120LC-6, PC130-6 2004 Service Manual

If you’ve ever torn down a hydraulic pump based on an aftermarket manual and then found the piston clearance was wrong because the torque spec was off, you know the pain. That’s why you need the real thing. This is the 2004 Komatsu factory service manual for the PC100-6, PC100L-6, PC120-6, PC120LC-6, and PC130-6 excavators. 846 pages of what the dealer uses, not some scanned copy with missing pages. The manual identifies serial numbers right on page 1: PC100-6 from 45221, PC100L-6 from 15200, PC120-6 from 57499, PC120LC-6 from 65504, PC130-6 from 51020. These machines mount the S4D102-1 engine, and for engine specific details you’ll also want the separate 102 Series Engine Shop Manual, but this book covers everything else: structure, function, testing, adjusting, disassembly, and maintenance standards.

Valve Clearance Adjustment: Why the Factory Spec Matters

Section 20 of this manual goes straight into ADJUSTING VALVE CLEARANCE. Not some generic range like “0.010 to 0.014 inches” – you get the exact Komatsu spec for intake and exhaust valves on the S4D102-1. The manual also includes the standard value table for engine-related parts so you know what slot to use on the feeler gauge. If you set them too tight you burn a valve, too loose you lose power and clatter. The testing procedures start on page 20-1, and they list every tool you need, from the flywheel turning tool to the torque wrench range. Don’t trust a third-party version that says “adjust to spec” without giving the spec – this manual gives page numbers, diagrams, and the order to tighten.

PC100-6 Hydraulic Pressure Testing – Don’t Guess

When you’re diagnosing a weak swing or drift in the boom, you need the OEM hydraulic pressure test procedure. This manual covers TESTING AND ADJUSTING HYDRAULIC PRESSURE IN WORK EQUIPMENT, SWING, TRAVEL CIRCUIT – right there in Section 20. You also get PC valve output pressure and LS valve differential pressure tests. The manual includes the exact pressure values in psi (Imperial, as required) and the step sequence to isolate which component is failing. Before you dive into hydraulics, it helps to understand the basics of Manual Transmission to see how power is transmitted, but on these excavators the swing motor and travel motors are all hydraulic, so the pressure test procedures are your roadmap. The required tool list includes a pressure gauge set, adapters, and a flow meter for measuring leakage. If you skip that step you’ll be chasing ghosts.

What’s Inside the 846-Page Manual?

This isn’t a pocket guide. Here’s what the TOC shows:

• 01 GENERAL – assembly drawing, specs, weight table, lubricant list
• 10 STRUCTURE AND FUNCTION – radiator, oil cooler, PTO coupling, power train, final drive, swing circle, track frame, hydraulic piping and circuit diagrams, control valve, CLSS, swing motor, center swivel joint, travel motor, PPC valves, safety lock valve, accumulators, straight-travel system, solenoid valve, breaker filter, work equipment, air conditioner, full electric wiring diagrams, engine control system, electronic control system, machine monitor, front window auto pull-up
• 20 TESTING AND ADJUSTING – standard value tables (engine, chassis, electrical), tools list, engine speed, exhaust color, valve clearance, blow-by, fuel injection timing, oil pressure, belt tension, engine speed sensor, governor lever stroke, hydraulic pressure tests, PC/LS valve, control pump, solenoid, PPC valve, travel deviation, hydraulic drift, oil leakage, remaining pressure release, swing circle clearance, track shoe tension, bleeding air, full troubleshooting with service codes and modes (N mode, E mode)
• 30 DISASSEMBLY AND ASSEMBLY
• 40 MAINTENANCE STANDARD
• 90 OTHERS

That’s a lot of content. The troubleshooting section alone covers over a hundred pages with detailed charts and connector pin diagrams. If you’re dealing with an intermittent engine speed irregularity or an E-code on the monitor, you’ll find the diagnosis path laid out step by step.

Why OEM Documentation Beats Aftermarket

I’ve seen aftermarket manuals list a torque for the control valve mounting bolts that was 20 ft-lbs too low because they copied from a different model. On a Komatsu, the CONTROL VALVE section in Structure and Function includes the exact valve body bolt torque. The manual doesn’t say “tighten securely” – it gives you the number. Same for the swing motor mounting bolts, the travel motor caps, and the accumulator retaining bolts. Aftermarket shops often leave out the safety warnings like the procedure to RELEASE REMAINING PRESSURE IN HYDRAULIC CIRCUIT before opening any line. That’s covered in Section 20. This manual is the only source that has the Komatsu part numbers, fitting sizes, and the correct flow diagrams for the CLSS (Closed Loop Swing System). Don’t waste a Saturday because a knockoff manual omitted the LS valve adjustment procedure.

3 Key Sections That Prevent Costly Repairs

First: the TROUBLESHOOTING section with service code tables and connector arrangement diagrams. When you get a code like E308 for fuel control dial input, you can jump to that page and follow the test sequence. Second: the STANDARD VALUE TABLES for engine, chassis, and electrical parts. You need those to know if your blow-by pressure or track tension is within spec. Third: the DISASSEMBLY AND ASSEMBLY section. It gives you the order of bolt removal, special tool numbers, and orientation marks. For example, the swing motor disassembly shows the correct procedure to remove the motor without damaging the barrel. If you try to wing it, you’ll be buying a new motor. The manual also includes a table of lubricant and coolant capacities – you won’t overfill or underfill the hydraulic tank.

Now, if you are working on an older model, the Manual Transmission concepts might help you understand the PTO coupling, but the electronic control system on these -6 series is more like a computer network than a mechanical linkage. Don’t let that scare you – this manual explains the ELECTRONIC CONTROL SYSTEM and the MACHINE MONITOR SYSTEM in detail, including the front window auto pull-up system. It’s all there.

Want to compare it with other versions? Check out the KOMATSU PC100-6 PC120-6 Shop Manual SEBM003307 or the KOMATSU PC100-6 PC120-6 Shop Manual for slightly different serial number ranges. But for these models covered here (PC100-6, PC100L-6, PC120-6, PC120LC-6, PC130-6 from the 2004 production), this is the exact manual you need.

Frequently Asked Questions

Does this manual cover the S4D102-1 engine?

Yes, the manual references the engine mounted on these machines. For detailed engine overhaul procedures, you’ll need the separate 102 Series Engine Shop Manual. This manual covers all chassis and hydraulic systems.

What kind of troubleshooting does the manual include?

It includes full troubleshooting for the engine throttle/pump controller (E mode) and communications system (N mode). There are judgment tables, electrical circuit diagrams, and detailed steps for each service code like E308, E317, E318, E306, E315, E316. It also covers the connector pin connection table and special functions of the monitor panel. You’ll find bleeding air procedures, drift testing, and oil leakage measurement – everything you need to track down an issue without swapping parts.

Are torque specifications provided for all fasteners?

Yes, for all critical fasteners in the structure and function sections – control valve bolts, swing motor, travel motor, hydraulic pump mounting, track shoe bolts, and more. The maintenance standard section gives standard torque values for common bolt sizes. Refer to the standard value tables for engine and chassis parts.

Is this a reprint or a digital copy?

Digital access of the original factory PDF. 846 pages, fully bookmarked, searchable. No missing pages, no watermarks.

This manual sits on my bench when I’m working on a Komatsu excavator. It’s saved me hours of guesswork on hydraulic pressure settings and wiring diagnoses. Stop relying on forum posts that contradict each other. Access the Factory Manual and get the right data in your hands.

• Related Manuals:
• Komatsu PC100-6 PC120-6 PC130-6 2004 Service Manual”>Komatsu PC100-6 PC120-6 PC130-6 2004 Service Manual
• KOMATSU PC100-6 PC120-6 Shop Manual SEBM003307″>KOMATSU PC100-6 PC120-6 Shop Manual SEBM003307
• KOMATSU PC100-6 PC120-6 Shop Manual”>KOMATSU PC100-6 PC120-6 Shop Manual