Description

Komatsu PC27MR-2, PC30MR-2, PC35MR-2, PC50MR-2, PC40MR-2 2007 Workshop Manual

If you have ever tried to chase a hydraulic leak on a Komatsu PC27MR-2 without a factory diagram, you know the kind of time that disappears. Aftermarket manuals skip half the steps and get torque specs wrong. This Komatsu PC27MR-2, PC30MR-2, PC35MR-2, PC50MR-2, PC40MR-2 2007 Workshop Manual is the real print from Komatsu, 630 pages of procedures that match what the dealer uses. No substitutes.

Engine Specs and Cylinder Data

Each model mounts a specific diesel engine. The PC27MR-2 uses the 3D82AE-5M; the PC30MR-2 uses the 3D84E-5N; the PC35MR-2 mounts the S3D84E-5PBA and 3D88E-5P; the PC40MR-2 and PC50MR-2 both run the 4D88E-5X. All cylinder head torque sequences, valve clearance adjustments, and compression pressure specs are listed in Section 01. Measuring compression pressure? There is a dedicated procedure in Section 20 with the exact tool list and acceptable readings. That is the kind of detail you pay for when you buy OEM documentation.

What Torque Values Are Listed?

Torque values appear throughout the manual, but the backbone is the Standard Value Table for Engine Related Parts and the Standard Value Table for Chassis Related Parts in Section 20. These tables give you the foot-pounds for every critical fastener: cylinder head bolts, main bearing caps, connecting rods, swing circle bolts, and hydraulic pump mounting hardware. If you are rebuilding a swing motor or replacing a track shoe, you need those numbers on your bench. The manual also includes lubrication specifications—what oil, how much, and the viscosity grade for temperatures down to freezing.

7 Systems Covered in Section 10

Section 10, Structure Function and Maintenance Standard, breaks down the machine into seven major systems: PTO, cooling system, power train, swing circle, swing machinery, track frame, and hydraulic components. Each subsystem gets its own subsection with exploded views, dimensional drawings, and inspection standards. The cooling system section covers radiator cap pressure, fan belt tension, and coolant capacity. The hydraulic layout drawing shows every line, cylinder, and valve location. That drawing alone saves an hour of tracing hoses on a dirty undercarriage.

Fuel and Cooling: Factory Test Procedures

Fuel injection timing, fuel control lever adjustment, and alternator belt tension are all in Section 20. The manual walks you through measuring engine speed with a tachometer, checking exhaust gas color, and adjusting valve clearance with feeler gauges. For the cooling system, you get the compressor belt tension specs and air conditioning component testing. Nobody in the field has time to guess belt tension—this manual tells you the deflection at a given force.

Get the Right Torque Data from Standard Value Tables

The standard value tables begin on page 20-1. They list acceptable ranges for things like engine oil pressure, LS differential pressure, and swing holding brake release pressure. If you are troubleshooting drift in the work equipment circuits, you need those numbers. The manual also includes a list of required testing tools, from pressure gauges to T-adapter boxes. Do not start a hydraulic pressure test without verifying the correct port and gauge range—the manual shows you exactly which adapter goes where.

Source Authenticity: OEM vs Aftermarket

I have seen aftermarket manuals that claim to cover the PC50MR-2 but omit the electric control system altogether. This is a Komatsu-printed book from 2007, revision 11, with a revision table on page 00-2-1 that tracks every changed page. The wiring diagrams in Section 10 come with connector pin numbers and a connector arrangement diagram. The troubleshooting section lists real fault codes (E-1 engine does not start, H-3 whole work equipment does not work). Those are the actual procedures a dealer technician follows. You do not get that from a third-party PDF that compresses 630 pages into 200.

Who Is This Manual For?

Home garage guys who maintain their own compact excavator will get the most out of this manual. If you own a PC27MR-2 or PC30MR-2 and want to do your own undercarriage work, the standard values for track shoe tension and carrier roller clearance are in Section 20. If you run a small fleet of PC35MR-2 machines and need to swap a hydraulic pump, Section 30 covers disassembly and assembly with torque specs for every bolt. For the PC40MR-2 and PC50MR-2, the swing machinery section gives you the bearing clearance measurement procedure. Beginners should start with the safety warnings and the points to remember before troubleshooting—the manual spells out what NOT to do with high-pressure hydraulic lines.

Every section is laid out with the steps in order, tool by tool. You will not find a shorthand that assumes you know which wrench size fits the PPC valve locknut. It is written for a mechanic who has the machine in front of them and needs the next step now.

Does this manual cover the PC40MR-2?

Yes. The manual covers PC27MR-2, PC30MR-2, PC35MR-2, PC40MR-2, and PC50MR-2.

What engine does the PC35MR-2 use?

It mounts the S3D84E-5PBA and 3D88E-5P engine. For details, see the 68E-88E Series Engine Shop Manual referenced in the manual.

Are there wiring diagrams for the electrical system?

The electrical section is more than just diagrams. It starts with the component parts of the system, then moves to the monitor system, monitor panel, and sensors. The troubleshooting section for E-Mode covers specific failures like engine not starting, engine not stopping, work equipment lock issues, windshield wiper problems, and air conditioner defects. Each fault has a step-by-step check list. The connector arrangement diagram and pin tables let you verify continuity without guessing. This level of detail is what separates a factory manual from aftermarket copies.

How many pages is this manual?

630 pages including appendices.

When you buy this manual, you are buying the same resource that Komatsu dealers use. The step-by-step repair procedures, required tool lists, safety warnings, and OEM torque specifications are all there. Do not waste time on aftermarket shortcuts. Access the Factory Manual and get back to work with the right numbers on your bench.

Related Manuals

• Komatsu PC27MR-2 PC30MR-2 PC35MR-2 PC50MR-2 Parts Catalog”>Komatsu PC27MR-2 PC30MR-2 PC35MR-2 PC50MR-2 Parts Catalog
• Komatsu PC27MR-2 PC35MR-2 Operators Manual – OEM 261 Pages”>Komatsu PC27MR-2 PC35MR-2 Operators Manual – OEM 261 Pages
• Komatsu PC30MR-2 PC35MR-2 Service Manual – 238 Pages OEM Shop Manual”>Komatsu PC30MR-2 PC35MR-2 Service Manual – 238 Pages OEM Shop Manual

Refer to the Manual Transmission”>Manual Transmission section in the powertrain chapter of this workshop manual for gearbox specifications. The Manual Transmission”>Manual Transmission section covers gear ratios and shifter adjustment procedures.