Description

Komatsu PC95R-2 Workshop Manual: The Only Factory Specs That Matter

If you’re in a shop trying to get a Komatsu PC95R-2 hydraulic excavator back to work, the last thing you need is a manual that guesses at torque values or skips the hydraulic pressure specs. I’ve seen guys waste an afternoon on a boom cylinder seal because some aftermarket reprint left out the critical tightening sequence for the gland nut. That doesn’t happen with this Workshop Manual. It’s a direct copy of the binder Komatsu issued to dealers – 366 pages of nothing but verified numbers and factory procedures. No fluff, no “approximate” torque, no third-party rewriting.

Komatsu PC95R-2 Workshop Manual: What’s Inside

The TOC starts with the STANDARD TIGHTENING TORQUE table – that’s your baseline for every bolt on the machine. Then it goes straight into STRUCTURE AND FUNCTION, covering the power train, swing circle, final drive, and the full hydraulic diagram (standard and 2-piece boom). Every valve is broken down: 9-spool control valve, blade valve, travel valve, boom swing valve. You get the swivel joint, travel motor, cylinders, servocontrol feed unit, accumulator, shuttle valve, PPC valve, and all the safety valves. The electrical diagrams run five pages. After that, TESTING AND ADJUSTMENTS gives you the procedures for measuring engine speed, adjusting valve clearance, compression pressure, fuel injection timing, fan belt tension, track shoe tension, and every hydraulic pressure check you’ll need. The REMOVAL AND INSTALLATION section covers everything from the starter motor to the 2nd boom cylinders. Need the charge pressure? Page 73 in the testing section gives you the normal technical data table.

Does This Manual Cover the Hydraulic System?

Yes, and it does it properly. The hydraulic diagram section shows the standard setup and the 2-piece boom configuration with full line routing. The 9-spool and 10-spool control valves are drawn out with port assignments. Each valve section – blade, travel, boom, arm, bucket, boom swing – gets its own breakdown. The testing section includes procedures for checking and regulating pressure in the hydraulic circuits (page 20-31), setting main valves, adjusting the PC valve, measuring LS differential pressure, and adjusting the LS valve. If you’re chasing a drift in the boom or swing, there’s a dedicated section on ANALYSIS OF THE CAUSES OF HYDRAULIC DRIFTS (page 20-47). That’s the kind of diagnostic info that saves a teardown when the problem is a stuck shuttle valve.

Get the Proper Torque Specs

Don’t trust generic torque charts. This manual has the STANDARD TIGHTENING TORQUE table up front, and every specific joint is called out in the removal/installation procedures. When you’re torquing the cylinder head bolts (page 30-19), the sequence and final angle are listed. Same for the swing motor mounting bolts, final drive bolts, and track shoe hardware. I’ve torqued more head bolts than most people have had hot meals – and I still reach for the factory spec when it’s a Komatsu. You should too.

3 Reasons to Choose OEM Documentation

First, the wiring. Aftermarket manuals often redraw circuits incorrectly. This manual has the full ELECTRICAL DIAGRAM (1/5 through 5/5) – five sheets of the original factory schematic. Second, the testing data. The NORMAL OR STANDARD TECHNICAL DATA table gives you baseline pressures, flow rates, and clearances that aftermarket sources copy from each other and get wrong. Third, the safety warnings. Komatsu’s SAFETY section at the beginning covers hoisting instructions, jacking points, and lockout procedures that a reprint might omit because they “save space.” Saving space gets someone hurt.

Testing and Adjustments: Field-Ready Procedures

The testing section (20-1 through 20-57) is where you’ll spend most of your time. It covers: measuring engine speed, adjusting valve clearance, measuring compression pressure, testing/adjusting fuel injection timing, fan belt tension, accelerator lever stroke, safety microswitch, swing circle axial clearance, track shoe tension, air bleeding from hydraulic circuits, releasing residual pressure, checking/regulating hydraulic circuit pressures, setting main valves, adjusting PC valve, measuring LS differential pressure, checking/adjusting servocontrol feed unit pressures, measuring pump delivery and flow control starting point, travel deviation, inner oil leakage of travel motor, adjusting boom/arm safety valves, 2nd boom safety valves, pressure switch signal overload, internal oil leakages in swing motor, checking swivel joint leakages, analysis of hydraulic drifts, testing air conditioning unit, and emptying it. That’s 57 pages of factory procedures you can trust.

Need more background on how a manual transmission works in a wheeled loader? Check Manual Transmission for the basics, but for this excavator you rely on the factory diagrams. And if you’re working on other Komatsu machines, the related KOMATSU PC95R-2 Hydraulic Excavator Shop Manual is the same quality. There’s also a Komatsu PC95R-2 Hydraulic Excavator Operation & Maintenance Manual if you need daily checks and fluid specs. For wheel loaders, see Komatsu WA65-5 WA70-5 WA80-5 2005 Workshop Manual. And for more on transmission theory, Manual Transmission is a good reference.

This isn’t a reprint or a scan of a scan. It’s a clean digital copy of the original Komatsu SHOP MANUAL PC95R-2. The page numbers match the factory binder. If you see a page missing mark in the REVISED PAGES section, you know exactly what changed and when. That level of traceability is why OEM documentation matters.

Q: Is this the same manual that Komatsu dealers use?

Yes. This is the exact factory shop manual – same part number, same content, same layout. No edits, no abridgments.

Q: Does this include torque values for all hydraulic fittings?

The STANDARD TIGHTENING TORQUE table covers bolt grades and sizes for general hardware. For specific joints like the boom cylinder gland nut or swivel joint bolts, the removal/installation procedures list the required torque. If you need a torque value for a fitting not in the table, check the component’s section – it’s there.

Q: How many pages is it?

366 pages total, including the cover, safety section, TOC, revised pages, and all three major sections: Structure and Function (10-), Testing and Adjustments (20-), and Removal and Installation (30-).

Q: I need hydraulic pressure specs for the PC95R-2. Where do I find them?

The NORMAL OR STANDARD TECHNICAL DATA table in the Testing and Adjustments section lists all the baseline pressures – main relief, LS differential, pilot pressures, etc. Then each specific test procedure tells you the correct gauge setup and adjustment method. For example, checking the main relief pressure is under “TESTING AND SETTING OF MAIN VALVES” on page 20-31.

You’ve got a machine that needs the right numbers. Don’t rely on aftermarket speculation. Access the factory manual and get the specs that Komatsu stamped into the steel.