Description

Komatsu PW110R-1 Workshop Manual

If you’re chasing hydraulic drifts on a PW110R-1 and the aftermarket PDF tells you “adjust the valve until it feels right,” you already lost money. The Komatsu PW110R-1 Workshop Manual on this page is the genuine factory document. 522 pages, directly from Komatsu. No reprints, no third-party summaries, no missing pages. Every torque value, every valve clearance spec, every hydraulic pressure number is the one Komatsu’s own techs use.

I’ve torqued head bolts on everything from a Ford 300 to a Komatsu SAA6D95LE. The difference between a job that stays sealed and a job that weeps a month later is one thing: the right torque spec from the right source. This manual gives you that. The KOMATSU PW110R-1 Hydraulic Excavator Shop Manual [LINK_ID_REL_0] is laid out the same way Komatsu trains its dealer mechanics – section 10 for structure and function, section 20 for testing and adjustments, section 30 for removal and installation. No fluff, no filler.

Structure and Function: What the 10-Series Covers

Section 10 in this manual runs over 140 pages. It starts with the P.T.O. and works through every major hydraulic component: power train, front axle, transmission, rear axle, steering unit, swing circle, swing machinery. The hydraulic diagram standard diagrams are included. You get the full hydraulic circuit for work equipment, the pump group, priority valve, control valve, swing motor, swivel joint, travel motor, cylinders, and every valve in the system – shuttle valve, PPC valves, brake pump, boom and arm safety valve, overload sensor switch, solenoid valves. That’s the level of detail you need when a control valve starts spooling lazy and you have to decide whether to rebuild or replace.

This manual even covers the air-conditioning unit and electrical diagram in section 10. Most aftermarket PDFs skip the A/C wiring entirely. Not this one.

Does the Manual Include Torque Specs for the Transmission?

Yes. The transmission section in structure and function (section 10) includes exploded views and tightening torque values for the transmission housing, bearings, and shaft retainers. The standard tightening torque chart is in the front matter – right after hoisting instructions and before coating materials. If you’re rebuilding the reverser or replacing the direction indicator group, you’ll use those numbers. Don’t guess. One wrong torque on a transmission bolt and you’re buying a new case.

There’s also a dedicated removal and installation section for the transmission group in section 30. It walks you through the transmission-reverser, direction indicator, and headlight dipper beam control group. That kind of subassembly detail saves you from breaking something you didn’t know was attached.

Testing and Adjustments: Over 30 Procedures

Section 20 lists each test from measuring engine speed to adjusting the parking brake. The table of contents for section 20 alone has 38 line items. You get normal technical data tables, special tool numbers, and step-by-step procedures for adjusting valve clearance, measuring compression pressure, testing fuel injection timing, and bleeding air from hydraulic circuits. Every pressure check – main valves, PC valve, LS differential pressure, servocontrol feed unit, steering system, braking system – has a specified value and a procedure.

One thing I appreciate: the manual includes a procedure for releasing residual pressure from the circuits before you crack a line. That’s not a “maybe” step. That’s how you keep hydraulic oil out of your face.

Valve adjustments are covered thoroughly. You get PP valve clearance adjustments, safety microswitch adjustment, and swing circle axial clearance measurement. For the travel motor, there’s a whole subsection on checking and adjusting the automatic displacement control system and checking for leakages. If you’ve ever had a travel motor that creeps in high range, that procedure alone is worth the price of the manual.

Get the Right Pressure Settings – Page 20 Series

Need the charge pressure for the steering unit? Look in section 20 under “Checking and regulating the pressure of the steering system.” The pressure switch signal for overload operation? That’s under “Measuring and setting of pressure switch signal overload operation.” Each test gives you the normal value range, the special tool part number, and the adjustment method. No wondering if the spec is for a different model year.

This manual also covers the analysis of causes of hydraulic drifts. That’s a diagnostic procedure that lists possible internal leak paths – swing motor, swivel joint, control valve spools. It tells you how to measure internal oil leakages in the swing motor and how to check for leakages inside the swivel joint. When you have a customer complaining that the boom drops overnight, that section is your roadmap.

Transmission and Valve Systems: Factory-Level Detail

The transmission chapter in this manual isn’t a generic overview. It covers the reversible transmission (powershift type), the direction indicator switch adjustment, the speed surveyor adjustment, and the propeller shaft speed check. The torque converter section includes stall test procedures – something most aftermarket manuals omit entirely. If you’re replacing a transmission, the removal and installation section (section 30) shows you the exact sequence for unbolting the transmission from the engine-pump coupling joint and how to handle the gear-pump attached to it.

Valve systems run through the entire manual. The priority valve is covered in structure and function with a full hydraulic circuit diagram. The control valve has its own subsection. The PPC valves (right-hand, left-hand, outrigger, blade, boom swing, travel, 2nd boom) each get a dedicated chapter in section 10 and again in removal and installation. The boom and arm safety valve, the blade or outriggers safety valve, the solenoid valves – all present with Komatsu part numbers and cross-section views.

If you’re working on the servocontrol feed unit, section 20 has a specific procedure for checking and adjusting pressures in that unit. The accumulator, shuttle valve, and brake pump are all covered individually. This is not a “general hydraulic theory” manual; it’s a component-by-component repair manual.

One more thing: the manual includes a Manual Transmission [LINK_ID_EXT_0] reference in the context of the reverser and direction indicator group, confirming the exact terminology Komatsu uses for the gearbox assembly. That external link gives you a quick background if you need to brush up on transmission fundamentals. For a broader context, the Automotive Industry Overview [LINK_ID_EXT_1] page covers equipment standards but for this machine, the factory manual is your only source you should trust.

I’ve been burned by aftermarket manuals that claim “covers all models” but skip the 2-piece boom cylinder removal sequence or the boom swing PPC valve clearance spec. This one doesn’t. Pages 20-30 show the exact feeler gauge thickness for PPC valve clearances. The removal section for the boom cylinder (1-piece and 2-piece) is separate and complete. If you’re swapping a bucket cylinder, the manual shows the disassembly order and the O-ring sizes.

Related Manuals

• KOMATSU PW110R-1 Hydraulic Excavator Shop Manual [LINK_ID_REL_0]
• Komatsu WA65-5 WA70-5 WA80-5 2005 Workshop Manual [LINK_ID_REL_1]
• Komatsu WH609-1E0 WH613-1E0 WH713-1E0 WH714H-1E0 WH716-1E0 Workshop Manual [LINK_ID_REL_2]

Is this a PDF format or a printed book?

Digital PDF format. You get the full 522-page OEM factory scan in high resolution. Print what you need.

Does it cover the engine rebuild?

Yes – the manual includes cylinder head removal, injection pump, turbocharger, injection nozzle, thermostat, and muffler procedures. It also covers measuring compression pressure and adjusting valve clearance. Engine-specific torque specs are listed in the standard tightening torque table.

What serial numbers does this cover?

PW110R-1 2260010001 and up. If your machine falls outside that range, check your serial plate – you may need an earlier or later revision.

Are wiring diagrams included?

Yes. Section 10 includes a complete electrical diagram. Section 20 covers testing of the alternator, starter motor, and overload sensor switch. The solenoid valve wiring is also shown in the electrical diagram.

You can waste a day cross-referencing torque values from three different forum posts, or you can open this manual and see the spec Komatsu printed. The choice is yours. Access the Factory Manual and get the job done right.