Description

Komatsu PC750-6, PC800-6, PC750SE-6, PC750LC-6, PC800SE-6 2004 Workshop Manual

I have torqued head bolts on more engines than most techs have changed oil. When I needed the correct valve clearance numbers for a PC750-6 SAA6D140E-3, I pulled this manual. Not some aftermarket copy that guesses at the spec. This is the OEM factory document from Komatsu, printed in 2004. 730 pages of exactly what you need to keep that excavator digging. The fuel system section alone — from handling equipment in the fuel circuit to bleeding air — is worth the access. You get the real procedure for releasing remaining pressure in the fuel system before you crack a line. That saves a face full of diesel and a fire risk.

The manual covers five models: PC750-6, PC800-6, PC750SE-6, PC750LC-6, and PC800SE-6. Serial numbers 11001 and up for the 750s, 31001 and up for the 800s. If you work on any of these, you need the factory standard value tables. The standard value table for engine is right there in Section 20 — page numbers vary depending on revision, but it’s in the Testing and Adjusting chapter. Want to measure blow-by pressure or compression? The procedure is laid out with tool lists. You don’t guess an inch-pound torque on a swing motor bolt. This manual gives you the OEM number.

Engine Overhaul and Valve Clearance Data

Section 20 covers adjusting valve clearance. That’s a job where a 0.001-inch shim stack matters. The manual details the sequence and the feeler gauge spec. It also includes measuring air supply pressure (boost) and exhaust temperature. If you’ve had an engine that won’t pull, you check those numbers against the Standard Value Table for Engine. The manual tells you exactly where to put the gauge and what to read. No fluff. Just the numbers.

Does This Manual Cover the Fuel System?

Yes. Section 20 has a subsection: Handling Equipment in Fuel Circuit, Releasing Remaining Pressure in Fuel System, Measuring Fuel Pressure, Bleeding Air from Fuel Circuit, Checking for Leakage in Fuel Circuit. That’s not a generic list — those are the exact headings from the PDF contents. Page 20-x (the manual uses revision markers, but the content is there). If you have a PC800-6 that won’t start after a filter change, you follow the bleeding air procedure. It tells you the order to crack the injection lines. I’ve seen guys skip that and crank for ten minutes. This manual saves the battery.

7 Key Systems Covered in Section 10

Section 10 is Structure, Function and Maintenance Standard. It breaks down everything from the PTO and swing machinery to the track frame and recoil spring. Need to rebuild a travel motor? The manual lists the component parts and clearance limits. The L.H. 5-spool control valve and R.H. 4-spool control valve are shown with hydraulic schematics. The valve adjustment for the PPC control relief valve is in there. If you’re chasing a hydraulic drift issue, Section 20 has Testing Locations Causing Hydraulic Drift of Work Equipment. That’s a direct link to a real problem on these machines.

Source Validity: OEM Factory Print vs Aftermarket Guesses

I don’t trust aftermarket documentation. Ever. This manual is the original Komatsu factory PDF. You get the revision list (pages with marks indicate replacements or additions — see the list of revised pages in the front matter). That means you know the manual has been updated. The official Komatsu part number for this reference is SEBM025305. Compare that to a scanned third-party file that lost half the torque specs. This PDF preserves every page. The Fuel capacity table in Section 01 gives the exact fluid volumes for the hydraulic tank and fuel tank. You don’t overfill and wreck a seal.

Testing and Adjusting: Real-World Use Case

Picture this: You have a PC750SE-6 with an error code E924 (drop in engine oil pressure). The manual’s Troubleshooting section for the Engine Controller System (E Mode) gives you the judgment table and the electrical circuit diagram. Page references are listed in the contents — you go to the specific chart. It tells you which sensors to check and in what order. That beats chasing a ground fault for two hours. The manual also covers handling engine controller high voltage circuit — safety warning. If you skip that, you could fry the ECM or get shocked. This is what I mean by safety-obsessed. The manual says it.

FAQ

Does this manual include torque specs for the final drive bolts?

Yes. The Standard Value Table for Chassis in Section 20 lists torque specifications for track roller, carrier roller, and final drive components. The values are in foot-pounds and Newton-meters.

Will this work for a PC800-6 with a SAA6D140E-3 engine?

Yes. The manual covers PC800-6 and PC800SE-6. It explicitly states that PC750, 800-6 mount the SAA6D140E-3 engine. For engine details, it references the separate 6D140-3 Series Engine Shop Manual.

I need the wiring diagram for the monitor panel – where is it?

Section 10 has the Monitor System and Sensors. The Troubleshooting section includes electrical circuit diagrams for N mode (communication), E mode (engine controller), and more. Look for the connection table for connector pin numbers.

How do I release remaining pressure in the hydraulic circuit?

Go to Section 20 — the procedure is titled “RELEASING REMAINING PRESSURE IN HYDRAULIC CIRCUIT”. It tells you to cycle the control levers with the engine off. Don’t skip this step; hydraulic fluid at 5000 psi will injure you.

You want a manual that actually gets your machine back to work. This is the one. I’ve used it. The factory specs are correct. The troubleshooting charts are structured so you don’t waste time. Access the Factory Manual now and have it on your tablet or printed out. It’s worth every page.

Related manuals you may need: Komatsu PC750-6 PC800-6 1996 Field Assembly Instruction”>Komatsu PC750-6 PC800-6 1996 Field Assembly Instruction, Komatsu PC750/PC800 HYDRAULIC EXCAVATOR Field Assembly – Section: B-15 Greasing “>Komatsu PC750/PC800 HYDRAULIC EXCAVATOR Field Assembly – Section: B-15 Greasing , KOMATSU PC750-6 PC800-6 Shop Manual”>KOMATSU PC750-6 PC800-6 Shop Manual. External references: Manual Transmission”>Manual Transmission, Manual Transmission”>Manual Transmission.