Description

Komatsu PC1100-6, PC1100SP-6, PC1100LC-6 1998 Workshop Manual

You’re staring at a 100-ton excavator that needs a fuel pump timing check, or maybe a valve clearance adjustment on the SAA6D170-2 engine. Without factory numbers you’re either guessing or wasting billable hours calling around. This Komatsu PC1100-6, PC1100SP-6, PC1100LC-6 1998 Workshop Manual gives you the exact data Komatsu printed for their techs. 753 pages, no aftermarket shortcuts, no missing pages.

What You Get Inside: 753 Pages of Factory Data

Five major sections: GENERAL (01), STRUCTURE AND FUNCTION (10), TESTING AND ADJUSTING (20), DISASSEMBLY AND ASSEMBLY (30), MAINTENANCE STANDARD (40), and OTHERS (90). The GENERAL section starts on page 01-1 with specification drawings and the Fuel, Coolant and Lubricants table. If you’re filling a PC1100-6 for the first time, that table tells you which oil grades and capacities to use. Don’t trust a generic cross-reference—use the factory data.

Fuel, Coolant, and Lubricants: The Right Fluids Matter

Section 01 includes a dedicated FUEL, COOLANT AND LUBRICANTS subsection. It’s not a paragraph of suggestions; it’s a table with part numbers and viscosity specs. The manual also covers the Fuel injection system in the testing section—adjustment timing and injection pump removal procedures are laid out step by step. You need to measure blow-by pressure? That procedure is in Section 20 alongside the fuel injection timing test.

Set Valve Clearance with Factory Authority

Valve lash on these big Komatsu engines isn’t something you eyeball. The ADJUSTING VALVE CLEARANCE procedure (part of Section 20) lists the cold-clearance specs for intake and exhaust Valves. It also tells you the correct feeler gauge thickness and the order of rotation for the crankshaft. Page 20-1 kicks off the entire Testing and Adjusting section. Follow that page to the valve procedure, and you’ll have the engine back together with the right clearances the first time.

Testing and Adjusting: Real Procedures from Section 20

Section 20 isn’t a generic troubleshooting list. It starts with a STANDARD VALUE TABLE FOR ENGINE RELATED PARTS, then a chassis table and an electrical table. After those, you get step‑by‑step instructions for measuring engine speed, boost pressure, exhaust temperature, compression pressure, and fuel injection timing. The TESTING AND ADJUSTING FUEL INJECTION TIMING entry alone is worth the price of the manual if you’ve ever had a 6D170‑2 run rough after a pump swap. Each test lists the required tools—Komatsu part numbers or generic equivalents—and the pass/fail limits.

Hydraulic circuit testing gets its own sub‑section: TESTING AND ADJUSTING HYDRAULIC PRESSURE IN WORK EQUIPMENT, SWING, TRAVEL CIRCUIT. If you’ve got a drift issue in the boom, the manual tells you the exact port to measure and the pressure setting for the relief valves. The TESTING LOCATIONS CAUSING HYDRAULIC DRIFT OF WORK EQUIPMENT procedure walks you through isolating internal leakage. That kind of diagnostic flow saves hours on a machine that’s down.

For the power train, the FINAL DRIVE and TRAVEL MOTOR sections in STRUCTURE AND FUNCTION (10) include exploded diagrams and internal clearances. If you’re rebuilding a travel motor, you need the bearing preload and gear lash specs—they’re in the MAINTENANCE STANDARD (40) section. The manual even covers the SAFETY VALVE and HORN VALVE in the air system. Yes, the horn valve. Because when you need it, you need the part number and adjustment.

Source Validity: OEM Komatsu vs. Aftermarket Reprints

I’ve seen third‑party manuals that merge two different machine models into one PDF and call it a “complete” workshop manual. Then you find a torque spec that’s for a different engine, and suddenly you’ve got a cracked cylinder head. This Komatsu PC1100-6, PC1100SP-6, PC1100LC-6 1998 Workshop Manual is the original factory print—same PDF that Komatsu Japan issued in 1998, with the revision marks and page numbers intact. The cover says Printed in Japan 03‑98(01)01651. That’s your proof. No reprint, no compilation, no missing pages.

Related Manuals You Might Need

• KOMATSU PC1100-6 Field Assembly Instruction”>KOMATSU PC1100-6 Field Assembly Instruction
• Komatsu PC1100-6 PC1100SP-6 PC1100LC-6 2002 Workshop Manual”>Komatsu PC1100-6 PC1100SP-6 PC1100LC-6 2002 Workshop Manual
• Komatsu PC1100-6 Shop Manual”>Komatsu PC1100-6 Shop Manual

The POWER TRAIN section in this manual covers the final drive and swing machinery, which are essentially a type of Manual Transmission”>Manual Transmission in that they use gears and clutches to transfer power. For deeper understanding of planetary gear theory, check the Manual Transmission”>Manual Transmission article on gear reduction fundamentals.

Frequently Asked Questions

Does this manual cover the PC1100LC-6 model?

Yes. The cover lists PC1100-6, PC1100SP-6, and PC1100LC-6 with serial numbers 10001 and up. All three variants are included in this one book.

Can I use this for the SAA6D170-2 engine?

The manual notes that the PC1100-6 mounts the SAA6D170-2 engine. Engine-specific procedures like valve clearance and injection timing are included here, but for a full teardown of the 6D170-2 series engine you should also get the separate 6D170-2 Engine Shop Manual. This workshop manual covers the engine as installed in the machine, with all chassis-related testing.

What torque specifications are included?

Section 20 contains three standard value tables: one for engine-related parts, one for chassis-related parts, and one for electrical parts. Those tables list tightening torques for critical fasteners like cylinder head bolts, main bearing cap bolts, and hydraulic connection fittings. The individual testing procedures also give the torque values for that specific job—for example, the fan belt tension adjustment lists the deflection force in pounds. You won’t find a generic “tighten until snug” here; each number came from Komatsu’s engineering department.

Is this a genuine OEM manual?

Yes. Printed by Komatsu in 1998.

If you’re working on a Komatsu PC1100-6, PC1100SP-6, or PC1100LC-6, you need the numbers that keep the job safe. Don’t trust a scanned reprint or a PDF cobbled together from parts diagrams. Get the original factory document. Access the Factory Manual and have the specs on your screen or printed at the job site.