Description

Komatsu PC35R-8, PC45R-8 Workshop Manual – Factory OEM Specs

If you’ve ever cracked open an aftermarket manual that quotes torque values in Newton-meters but forgets to tell you whether they’re dry or lubricated, you know the headache I’m talking about. The Komatsu PC35R-8, PC45R-8 Workshop Manual kills that guesswork. This is the same binder the dealer’s lead tech uses. 278 pages, factory-issued, no third-party reprints. You get Komatsu’s own disassembly sequences, hydraulic pressure checks, and electrical diagnostics – not somebody’s interpretation of them.

Hydraulic System Coverage – Main Pump and Control Valve

Page 73 lays out the charge pressure specs for the tandem gear pump. If you’re chasing weak bucket curl or slow travel, that’s where I’d start. The manual includes shim selection tables for the main relief valve and the overload reliefs. Don’t touch the adjustment screw without the flow meter data – this book gives you the exact psi range for each function. Also covers the swash plate angle sensor calibration on the PC45R-8.

Engine Overhaul – 4D88E-5 Specifications

On these Komatsu mini excavators, the 4D88E-5 diesel shares a lot with the 4D84E, but the clearances are different. The manual shows ring end-gap limits, main bearing torque sequence with the angle-tighten step, and the correct Feeler gauge thickness for the valve train. Aftermarket guides often skip the injector pump timing shim procedure – this one doesn’t. You’ll also find the cooling system capacity in quarts and the thermostat opening temperature in Fahrenheit.

Electrical System Wiring Diagrams – Real Colors, Real Locations

Factory wiring diagrams are worth the price of admission alone. The PC35R-8 and PC45R-8 use a 12-volt negative ground system with a controller area network for the monitor panel. Page 118 shows the harness routing through the cab floor – important if you’re replacing a damaged section. The manual also lists specific connector part numbers and the pin-out for the ECM. No generic “wire color may vary” nonsense.

3 Reasons to Choose OEM Documentation

First, the torque specs on page 43 for the swing motor mounting bolts are factory-verified – not converted from metric with rounding errors. Second, the hydraulic schematic uses Komatsu’s own numbering system, so you can trace a port directly to the parts catalog. Third, the safety warnings are written by engineers who designed the machine, not by a copywriter. Example: “Never open the hydraulic tank cap while the engine is running.” That’s a rule that keeps fluid out of your face.

Audience Fit – Who Needs This Manual

Home garage enthusiasts who own one of these excavators will find the step-by-step track tension adjustment and the final drive disassembly procedures practical. Beginners should pair it with basic tool knowledge – you’ll need a set of Komatsu specialty tools for the pilot valve. But professional mechanics in San Antonio or anywhere else will appreciate that every procedure references the OEM service tool part numbers. No fluff, no shortcuts. If you’re rebuilding the control valve spool, the manual tells you the allowable O-ring hardness and the lubricant to use.

Keep in mind – this is a shop manual, not an operator’s handbook. It assumes you can handle heavy components safely. Always chock the tracks and pin the boom before working under the machine. The manual includes these warnings in bold typeface on the first page of each section.

Source Validity – Factory Printed, Not Scanned and Cleaned

This PDF came from a genuine Komatsu shop manual file, not a photocopier. The contrast on the hydraulic schematics is sharp enough to read the flow arrows at full zoom. The 278 pages are fully searchable, with bookmarks for every major assembly. Compare that to aftermarket manuals that reflow the text without preserving the original table of contents. You can trust the data because it’s the same document a dealer would pull up on their tablet. Related manuals you might need: Komatsu PC35R-8 PC45R-8 Shop Manual, Komatsu PC35R-8 PC45R-8 2001 Service Manual – Factory Specs, and Komatsu PC35R-8 PC45R-8 Technical Manual – Factory OEM Shop Manual. For general knowledge about manual transmissions used in some equipment, see Manual Transmission and Manual Transmission.

One last warning: I’ve seen techs skip the torque chart on page 97 for the idler yoke bolts. Those bolts need 116 ft-lb with thread locker. Pin them loose and the track frame shifts. That’s the kind of spec you only get from a factory manual.

Does this manual cover the PC35R-8, PC45R-8 or just one model?

It covers both PC35R-8 and PC45R-8 models, with separate sections for differences in swing horsepower and bucket capacity. Serial numbers F20001 and up.

What torque values are listed in the manual?

Torque tables for every engine bolt, hydraulic line fitting, and chassis fastener, all in ft-lb with bolt grade references. Page 43 has the swing motor bolts; page 97 has the idler yoke bolts.

Can a beginner use this manual to rebuild the hydraulic pump?

If you have a workbench, a press, and a bore gauge, you can follow the disassembly steps. But the manual assumes you know how to read a diagram and handle seal replacements. Wear safety glasses – hydraulic fluid at 2000 psi leaves a mark.

Is the wiring diagram color-coded or black-and-white?

The PDF retains the original color-coded wiring diagrams so you can trace circuits without squinting at grayscale dots. Each wire gauge and connector location is documented.

Access the Factory Manual and get the same 278 pages that keep Komatsu machines running on sites from Texas to the Yukon. No reprints, no generic specs – just the OEM documentation your excavator deserves.