Description

Komatsu PC228US-3, PC228USLC-3 2007 Workshop Manual

You’ve got a Komatsu PC228US-3 or PC228USLC-3 on the lift (or in the mud), and the machine is down. Maybe the engine is smoking, the valve train is ticking, or the hydraulics are doing something the monitor panel doesn’t like. You don’t need a generic repair guide written by someone who’s never seen a Komatsu oil pan. You need the exact factory document that Komatsu’s own techs use. This is that document: the 2007 Workshop Manual, 672 pages, direct from the OEM.

672 Pages of Factory Specs – What You Get

This manual covers the entire machine. Not just the engine compartment, but the swing circle, final drives, track frame, and every valve in the hydraulic system. The table of contents alone runs multiple pages. You get five sections: GENERAL, STRUCTURE FUNCTION AND MAINTENANCE STANDARD, TESTING AND ADJUSTING, DISASSEMBLY AND ASSEMBLY, and OTHERS. That means you have the dimension drawings with weight table, the fuel/coolant/lubricant specs, and the standard value tables for both engine and chassis. Need to know the compression pressure on that SAA6D102E-2? Page 20-1 lists the standard value table for the engine. That page is your starting point for any performance test.

Engine and Valve Adjustments: Why This Manual Beats Aftermarket

Every aftermarket manual I’ve seen fudges the valve clearance on these engines. They give you a range, not a spec. Komatsu prints the exact clearance for intake and exhaust valves in the ADJUSTMENT OF VALVE CLEARANCE procedure. You’ll find it in the TESTING AND ADJUSTING section. The manual tells you the tool you need, the order of tightening, and the feeler gauge thickness. No guesswork. I’ve had techs skip the blow-by measurement step and end up with a cylinder that fires hot. Don’t be that guy. Follow the sequence: compression pressure, blow-by pressure, then valve lash. This manual has all three procedures back-to-back on the same page block.

Fuel, Coolant, and Lubricants – The Chapter You’ll Reference Most

In the GENERAL section (page 01-1) you’ll find the specification dimension drawings, but the real money is in the FUEL, COOLANT, AND LUBRICANTS table. Komatsu specifies the exact viscosity grade for your climate, the correct coolant mixture ratio, and the fuel cetane rating. If you’re running aftermarket hydraulic oil because it’s cheaper, you’re asking for pump wear. The manual gives you the OEM part numbers and capacities. When you’re bleeding air from the hydraulic circuit (procedure listed in TESTING AND ADJUSTING), you need the correct oil type to avoid foaming. This manual writes it out.

Testing and Adjusting Section: Real Procedures, Not Theory

This is where the manual earns its keep. The 20-series section includes tools for testing, adjusting, and troubleshooting. You get the inspection and adjustment of engine speed, measurement of exhaust gas color, and adjustment of engine speed sensor. But the part that saves you hours is the EMERGENT ESCAPE FROM FAILURE IN ENGINE CONTROL SYSTEM. When the electronic control system locks you out and the monitor shows an error code like [E112] or [E204], you don’t have to call the dealer. The manual walks you through the T-Branch Box and connection table for connector pin numbers. You can diagnose a short-circuit in the travel interlocking solenoid or the swing holding brake solenoid without swapping parts blindly. And if you’re dealing with hydraulic drift, the INSPECTION OF LOCATIONS OF HYDRAULIC DRIFT OF WORK EQUIPMENT procedure tells you exactly which valves to check.

Does This Manual Cover the Hydraulic System?

Yes, from the hydraulic pump through the control valve, main relief valve, variable pressure compensation valve, and all the way to the travel motor. There’s a separate sub-section for the LS-EPC valve, the self pressure reducing valve, and the swing motor. If you need to measure pump PC control circuit oil pressure or LS control circuit pressure, the manual gives you the test port location and the pressure spec. The table of contents lists every valve by name: attachment circuit selector valve, holding valve, boom hydraulic drift prevention valve. You won’t find a third-party manual that breaks down the CLSS (Closed Load Sensing System) like this one does.

Source Validity: OEM vs. Aftermarket

This is a genuine Komatsu workshop manual printed in 2007. The front cover says “All Rights Reserved, Printed in Japan.” Inside, every page has the revision marks and page numbers. Compare that to aftermarket reprints that blur the wiring diagrams and misprint torque values. I’ve caught aftermarket manuals listing the wrong oil capacity for the final drive. This manual is the file that Komatsu’s engineering department released. If you want to trust a manual with a $50,000 machine, trust this one.

Who Should Use This Manual?

You own a Komatsu PC228US-3 or PC228USLC-3 and do your own repairs. Maybe you run a small fleet in San Antonio like I do. You need to know the exact torque for the track shoe bolts, the clearance in the swing circle, and the procedure for replacing the boom angle potentiometer. This manual is written for the mechanic on the shop floor. It assumes you own a torque wrench and a feeler gauge. If you’re a home garage enthusiast who’s never bled a hydraulic system, start with the BLEEDING AIR FROM EACH PART section on page 20-something (check the index). But don’t skip the preparation steps. The manual lists the required tools at the start of each procedure.

Frequently Asked Questions

Does this manual cover the SAA6D102E-2 engine?

Yes. The manual refers to the 102 Series Engine Shop Manual for engine-specific details, but all adjustments (valve clearance, injection timing, oil pressure measurement) are covered in the TESTING AND ADJUSTING section for this machine.

Can I use this manual for the PC228USLC-3 as well?

Yes. The cover and the table of contents list both models. The serial number range is 30001 and up for both.

Are the wiring diagrams included?

Yes. The manual contains connector location charts, electrical circuit diagrams by system, and a connection table for connector pin numbers. Troubleshooting sections cover error codes with specific steps.

What if I need to rebuild the travel motor?

The DISASSEMBLY AND ASSEMBLY section (section 30) includes the travel motor procedure. Page references in the table of contents guide you to the specific pages.

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Stop guessing and start fixing. Access the Factory Manual now and get the real Komatsu specs on your screen.