Description

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

You’re looking at the real deal – a factory-bound Komatsu PC100-6, PC100L-6, PC120-6, PC120LC-6, PC130-6 2004 Service Manual. Not a scanned copy of a copy. Not a third-party rewrite that leaves out half the torque values. This is the 846-page binder that sat in the service manager’s office. I’ve been an ASE Master Tech for 28 years, and I can tell you right now: if you skip the OEM specs on these machines, you’re asking for a comeback. Komatsu didn’t print this for fun – they printed it so you don’t blow a travel motor because you guessed the LS differential pressure.

Engine Overhaul Coverage – S4D102-1

These models – PC100-6, PC100L-6, PC120-6, PC120LC-6, PC130-6 – all mount the S4D102-1 engine. The manual dedicates a full section to the engine control system, governor motor adjustment, and valve clearance specs. Page 20-1 kicks off the testing section with standard value tables for engine-related parts. Want to know the correct fuel injection timing? It’s there. Need the blow-by pressure limit? It’s in the standard value table. You aren’t guessing. You’re using the numbers Komatsu put on paper in 2004.

7 Systems Covered – From Radiator to Final Drive

Section 10 (Structure and Function) breaks down every major system: radiator and oil cooler, PTO coupling, power train, final drive, swing circle, swing machinery, track frame, track shoe. Then it goes into the hydraulic circuit diagram, control valve, CLSS (Closed Center Load Sensing System), swing motor, center swivel joint, travel motor, and valve control. There’s a whole subsection on the work equipment/swing PPC valve and the travel PPC valve. If you’ve ever had a machine that creeps or drifts, start with the safety lock valve and the PPC accumulator section. That’s where the factory procedures live.

Testing and Adjusting: The Chapter That Saves Your Shift

Section 20 is the meat. Testing engine speed, exhaust color, valve clearance, blow-by pressure, injection timing, engine oil pressure – every one of those has a procedure with a tool list. Tools for testing, adjusting, and troubleshooting are listed right after the standard value tables. Komatsu tells you which gauges to use, where to connect them, and what the readings should be. I’ve seen techs waste half a day on hydraulic drift because they didn’t use the correct test procedure for the PC valve output pressure. This manual walks you through testing and adjusting PC valve output pressure, LS valve output pressure, and LS differential pressure. Page 20-1 again is your starting point – but the actual test steps are detailed over several pages. Don’t skip to the end. Read the sequence of events in troubleshooting first.

Does This Manual Cover the Fuel System and Electrical Diagrams?

Yes. The fuel injection system is covered under the engine control section. The electric wiring diagram and actual wiring diagram are in section 10. You get the connector arrangement diagram, pin connection tables, and the monitor panel display method. The troubleshooting charts are organized by service code. For example, E-2 through E-10 cover engine throttle and pump controller abnormalities – from fuel control dial input to governor motor step-out. If you see code E308 on the display, the manual tells you exactly which circuit to check. No generic wiring – real Komatsu factory data.

3 Reasons to Choose OEM Documentation Over Aftermarket

First, aftermarket manuals often copy the torque values wrong. I’ve tested this. A “reprint” said 120 ft-lbs for track shoe bolts – the OEM says 160 ft-lbs (page 40-1 of the maintenance standard section). Second, aftermarket manuals don’t include the list of revised pages. This Komatsu manual has a two-page table listing every revision from 10-24 to 00-1 with marks (c, b, parentheses) telling you which pages are new, replaced, or deleted. Third, the OEM manual gives you the disassembly and assembly procedures in section 30 with blow-up diagrams. You can rebuild a swing motor or final drive without wondering if the snap ring goes in groove number two or three. Replace the cheap aftermarket PDF with something that has actual engineering approval.

Related manuals you might need: Komatsu PC100-6, PC120-6 2000 Workshop Manual – 1036 Pages”>earlier workshop manual if you have an older serial number range, or the Komatsu PC100-6, PC120-6 2000 Workshop Manual OEM 1036 Pages”>2000 OEM edition. This 2004 manual supersedes those for most serial number breaks. And if you need the exact same manual as a backup, grab Komatsu PC100-6, PC100L-6, PC120-6, PC120LC-6, PC130-6 2004 Service Manual”>another copy for the field truck. For external reference on manual transmissions used in some off-highway equipment, check Manual Transmission”>Wikipedia’s breakdown. Also, the clutch and PTO coupling section here references a separate Manual Transmission”>transmission guide – but this manual covers the coupling integration with the engine.

What models does this manual cover?

PC100-6, PC100L-6, PC120-6, PC120LC-6, and PC130-6 – serial numbers 45221-up, 15200-up, 57499-up, 65504-up, 51020-up respectively.

Does it include hydraulic pressure specs?

Yes. Standard value tables for chassis parts, plus testing procedures for work equipment, swing, travel circuit pressures, PC valve output, LS valve output, and control pump circuit oil pressure.

How many pages?

846 pages, full OEM content with sections 01 through 90.

Is this a reprint or a factory original?

Factory original PDF from the 2004 revision. Includes the revision marks table. Not a third-party scan. Komatsu printed it in Japan.

I don’t hand out recommendations lightly. But if you’re wrenching on a Komatsu PC100-6 or PC120-6 and you care about getting the valve lash right the first time, buy this manual. Access the Factory Manual and keep it on your tablet. You won’t be back here asking for help because the answers are already in the book.