Description

Komatsu GD555-3C Service Manual – Factory Documentation for the Motor Grader

You’re looking at the real deal – the Komatsu GD555-3C Service Manual straight from the factory. 271 pages of OEM content, not some scanned reprint or third-party summary. I’ve been wrenching for 28 years and I can tell you the difference between a manual that gets the job done and one that leaves you guessing. This one sits on the bench because it gives you the exact torque values, wiring schematic details, and safety procedures that Komatsu intended. If you’re rebuilding the engine or chasing a hydraulic leak, you need the page that tells you the charge pressure – not a generic number from a forum.

Safety Information: More Than a Warning Sticker

Komatsu didn’t slap a label on the machine and call it done. The SAFETY section runs over 30 pages covering everything from ROPS precautions to handling high-pressure hoses. Read the heading “PRECAUTIONS WITH HIGH-PRESSURE OIL” – it tells you exactly what happens when you crack a fitting without relieving pressure. I’ve seen guys skip that step and end up with injection injuries. The manual also covers asbestos dust hazard prevention, battery terminal removal, and the proper way to use booster cables. If you’re working on a GD555-3C, that section saves your hands and your life.

271 Pages of Factory Specs – What’s Inside

This isn’t a glossy brochure. The OPERATION chapter walks you through starting the engine, checking the service meter, and using the articulate lock pin. The MAINTENANCE section gives you the wear parts list, oil clinic procedures, and periodic replacement intervals for safety-critical parts like hoses and belts. Want to know how to adjust the work equipment posture? There’s a dedicated subsection. Every torque value for the engine, transmission, and chassis is factory-sourced – no aftermarket conversion errors. I’ve torqued enough head bolts to know that 10 ft-lbs off can turn an engine into a core. This manual gives you the number Komatsu stamped at the factory.

Does This Manual Cover the Engine?

Yes – the engine is covered in detail. The FOREWORD includes the emission control warranty for Canada and California Proposition 65 warnings. You’ll find the engine serial number plate position (page reference in the LOCATION OF PLATES section) and the service meter position. The OPERATION chapter has the starting engine procedure with checks before start, precautions in cold areas, and what to do if the battery is discharged. The MAINTENANCE section handles oil, fuel, coolant, and the electric system. If you’re rebuilding the Komatsu diesel in this GD555-3C, you get the factory step-by-step without having to reverse-engineer anything.

Get the Right Wiring Diagrams

Wiring in a motor grader can be a mess – lights, gauges, switches, fuses. The manual has a full diagram for the fuse box and a general view of controls and gauges. The TROUBLESHOOTING chapter covers what to do when the leaning piping is damaged or when you run out of fuel. Don’t trust aftermarket diagrams that guess pin positions. This manual gives you the Komatsu factory layout, so you can trace a short without blowing a module. I’ve seen more than one shop turn a simple wiring repair into a $2,000 disaster because they used a generic schematic. Use this one.

Audience Fit: Who Needs This Manual

If you own a Komatsu GD555-3C motor grader and do your own maintenance – or you’re a shop that works on these machines – this manual is the difference between a four-hour job and a four-day headache. Beginners will appreciate the step-by-step operation checks and the safety warnings that keep them from burning a hand on a hot exhaust. Pros will use the torque values and the wear parts list to quote jobs accurately. The manual is written for technicians who know how to read a spec sheet. It doesn’t talk down to you, but it also doesn’t assume you know where every bolt is. That balance is rare.

Source Validity: Why OEM Beats Aftermarket

I’ve got a stack of aftermarket manuals on my shelf that I use for doorstops. They reprint tables without checking whether the torque spec changed in a later production run. This Komatsu GD555-3C Service Manual is original factory documentation – 271 pages printed from the same files Komatsu sent to dealers. The page numbers, chapter headings, and layout match what you’d get if you ordered it from the Komatsu parts counter. If you’re serious about keeping that grader running, you don’t guess. You use the factory sheet. Motor grader history is interesting, but this manual will keep yours working.

FAQ: Common Questions About This Manual

Does this manual include the GD655-3C or GD675-3C models?

No. This is specific to the GD555-3C. If you need the GD655-3C or GD675-3C, see our related manuals below.

Where can I find the torque values for the cylinder head?

Torque specs are listed in the MAINTENANCE section under “Handling oil, fuel, coolant, and performing oil clinic.” You’ll also find them in the engine-specific procedures. The manual organizes specs by subsystem – engine, transmission, hydraulics – so you don’t flip through 50 pages to find one number. For the cylinder head, look in the engine chapter (page reference from the table of contents). I always cross-check with the factory chart because aftermarket manuals sometimes swap inch-pounds for foot-pounds. This one won’t do that.

Related Manuals

• Komatsu GD555-3C GD655-3C GD675-3C 2006 Workshop Manual
• Demag Komatsu H 285 S Service Manual – 544 Pages of Factory Specs
• Komatsu WA430-6 Service Manual – 306-Page OEM Shop Manual

External resources: Manual Transmission and Manual Transmission are topics covered in the operation chapter but the manual gives you the specific gear ratios for the GD555-3C. Don’t rely on general articles – get the factory data. Access the Factory Manual and put it on your tablet or print it out. Either way, you’ll have the exact information Komatsu intended for this machine.