Description

Komatsu PW110R-1 Workshop Manual – OEM Factory Service Specifications

I’ve seen guys trust a third-party PDF on a swing motor rebuild and end up with a valve stack that’s 30 ft-lbs off. That’s a day of teardown you don’t get back. This Komatsu PW110R-1 Workshop Manual is the factory book – the one the dealer techs used when the machine was new. It’s 494 pages of verified specs, not a reprint of a reprint. If you need to pull a transmission, set a PC valve, or bleed air from the brake lines, this is where you start.

Structure and Function: What the Factory Says About the Transmission

The manual opens with a full breakdown of powertrain components. Section 10 covers everything from the P.T.O. to the rear axle, but the transmission section (pages 10-??) lays out the gear train and hydraulic shift sequence. Need the standard tightening torque for the transmission housing bolts? That’s in its own chapter early in the book. Every torque value comes from the same engineer who signed off on the line drawings. I’ve never seen an aftermarket manual get these numbers right across all bolt grades.

Testing and Adjustments: Where the Real Work Happens

This is the section that saves your time. Section 20 walks you through measuring engine speed, adjusting valve clearance, and setting fuel injection timing. There’s a dedicated page for adjusting the PC valve and measuring LS differential pressure. If you’re chasing a hydraulic drift issue, the manual gives you a step-by-step analysis of causes (internal oil leakages, swivel joint wear, etc.). It lists the special tools you’ll need – none of that “use a generic wrench” nonsense. For example, the procedure for checking and regulating pressure in the servocontrol feed unit requires a specific test kit. Don’t skip it.

The Valve Section: LS, PC, Priority – What You Need to Know

Valve adjustments are where most guys mess up. The manual dedicates multiple chapters to the LS valve, PC valve, priority valve, and control valve. It explains the hydraulic circuit for work equipment and travel motors. There’s even a section on the solenoid valve groups (ST1 through ST4, plus OP1 and OP2). If you’re working on a boom swing or blade safety valve, the factory procedure shows you the exact shim thickness and pressure setting. No guessing. No “close enough.”

Disassembly and Assembly: 494 Pages of Part-by-Part Instructions

Section 30 is the heavy lift. It covers disassembly and assembly of the starter, alternator, injection pump, cylinder head, swivel joint, swing motor, and transmission. Each sub-assembly has its own chapter with torque values and wear limits. The manual lists coating materials and electric wire codes – stuff you won’t find in a generic guide. For the transmission rebuild, it includes the reverser, direction indicator, and headlight dipper beam control group. If you’re swapping a travel motor or the brake pump, the hoisting instructions tell you the safe lift points and weight table. Don’t skip the safety section either; it’s there for a reason.

Torque Specs and Fluid Capacities: Why the Standard Tightening Torque Section Matters

Early in the manual there’s a dedicated page for standard tightening torque – bolt grades, thread sizes, and the exact ft-lbs for each. Alongside that, the table of oil and coolant quantities gives you capacities for the hydraulic tank, transmission, and final drives. I’ve used these numbers to fill a dry machine and had zero leaks on startup. You won’t get that from a Haynes or a PDF that was scanned from a photocopy. This is the real deal.

Who Needs This Manual?

If you own a PW110R-1 hydraulic excavator – serial number 2260000282 and up – this is your service bible. It’s for the shop tech who needs to diagnose a swing motor leak, the field mechanic bleeding brake lines, or the owner who wants to rebuild the cylinder packs themselves. The DIY crowd with a home garage can handle the adjustments if they have the right tools. But don’t come crying to me if you ignore the torque spec on page 73 and strip an axle lock cylinder bolt.

Source Validity: Factory OEM vs. Aftermarket Docs

This manual is an original Komatsu publication. The file is WEBM000801 – that’s a Komatsu internal part number. Compare that to a reprint that says “compatible with” – real OEM manuals have the exact procedures used on the assembly line. The OCR even shows the original serial number range. I’ve had junky third-party manuals that skip the safety microswitch adjustment or list the wrong LS valve pressure. This one doesn’t. If you want to work on a Komatsu, use Komatsu’s data. Period.

Frequently Asked Questions

Does this manual cover the hydraulic circuit and valve adjustments?

Yes, including full schematics for the main pump, LS-PC valve, priority valve, and solenoid groups. The testing section has specific pressure checks for each circuit.

What makes this different from a generic manual that costs half the price?

A generic manual reuses illustrations from other models, guesses at torque values, and leaves out half the solenoid valve groups. This factory book has the exact electrical diagrams (four schematics), the swivel joint leakage test procedure, and the displacement control adjustment for the travel motor. It also includes the factory coding for electric wires and the coating material specs – details that prevent hydraulic oil leaks and electrical shorts. When you’re pulling a 2-piece boom cylinder, you want the digits Komatsu put on paper, not a PDF that a forum guy uploaded in 2009.

Related manuals: If you need a different model, check the KOMATSU PW110R-1 HYDRAULIC EXCAVATOR SHOP MANUAL again, or see the Komatsu WA65-5 WA70-5 WA80-5 2005 Workshop Manual for wheel loaders and the Komatsu WH609-1E0 WH613-1E0 WH713-1E0 WH714H-1E0 WH716-1E0 Workshop Manual for wheeled excavators. For background on how a Manual Transmission works, that’s separate from this book. The manual itself follows the standards used across the Automotive Industry Overview, but Komatsu does it better.

Don’t waste time with copies. Access the Factory Manual and get the exact numbers that keep your excavator running.