Description

MOXY MT 26, MT 31 2004 Workshop Manual

If you’ve ever tried to rebuild a hydraulic pump or pull a transmission on an MT 26 or MT 31 using some aftermarket PDF that skipped torque specs, you know the pain. I’ve seen guys strip bellhousing bolts because a third-party manual listed inch-pounds when it should have been foot-pounds. That doesn’t happen with this MOXY MT 26, MT 31 2004 Workshop Manual. It’s the exact same 931‑page book the dealer techs used, printed the year these dump trucks were built. Every spec, every diagram, every torque value comes straight from MOXY Engineering in Norway. No translations, no guesswork.

What Makes This 931-Page Manual Different?

On page 2 you get the full table of contents – nine chapters covering everything from the general safety chapter to optional equipment. The manual is dated December 2004, part number 512967. That means it matches the production run of these trucks. I’ve seen guys try to use a later edition on an early MT 31 and wonder why the wiring diagrams don’t line up. This one lines up. The file name alone tells you it’s authentic: MOXY_MT_26-MT_31_2004_Workshop_Manual_en-25628002295.pdf. That’s an original scan of the factory document.

Understand the Safety Warnings Before You Touch Anything

Chapter 0 has 23 subsections on workshop safety. Section 0.2.19.2 covers torque limits for screws – you need that before you snug a single fastener. Section 0.2.20 tells you how to handle oil seals without damaging them, and 0.2.23 covers bearing handling. Listen, I don’t care if you’ve been turning wrenches for twenty years – reading these pages will keep you from making a $4,000 mistake. The manual even warns about vibrations, injurious noise, and what happens when you jack up a truck without blocking the bodywork (section 0.2.11). That’s not fluff, that’s how you stay alive.

Chapter-by-Chapter Breakdown: From Engine to Optional Equipment

The manual splits into nine logical groups. Chapter 1 covers the engine group – everything from removal to injection pump timing. Chapter 2 is the transmission and torque converter. If you’re rebuilding a gearbox, you need the factory shim specs. Chapter 3 is drive line and brakes – that includes axle disassembly and brake bleed procedures. Chapter 4 handles the air system (governors, valves, compressor). Chapter 5 is the hydraulic system – pump, steering cylinders, hoist control valve. Chapter 6 is electrical – wiring diagrams with component locations. Chapters 7 and 8 cover the front and rear wagon (body and frame). Chapter 9 rounds it out with optional equipment. That’s 931 pages of step‑by‑step procedures, part numbers, and torque charts. Each chapter starts with a list of required tools – so you know exactly what you need before you crack a bolt.

3 Critical Areas Where DIYers Go Wrong – and How This Manual Fixes Them

First: torque values. Aftermarket manuals often copy metric torque specs wrong or leave out angle‑torque procedures. This manual lists torque limits for every screw type in section 0.2.19.2. Second: hydraulic pressure tests. The factory procedure for setting the relief valve on the MT 31 is not the same as a generic Caterpillar procedure – this manual gives you the test port location and the exact pressure in psi. Third: electrical diagnostics. The wiring diagrams in chapter 6 are color‑coded and identify every connector. Without them, you’re swapping parts. With them, you trace faults in minutes.

Hydraulic System: Factory Procedure for Pressure Testing

If you’re working on the MT 26 or MT 31 articulated dump trucks, the hydraulic system is where most downtime happens. Chapter 5 walks you through pump removal, steering valve overhaul, and cylinder seal replacement. Each step has torque specs and sealing‑compound types (like Loctite equivalents listed in section 0.2.19.1). You also get the location of the main components – see section 0.4. That’s not in any Haynes manual.

Who Needs This Manual – and Why You Shouldn’t Fake It

If you own an MT 26 or MT 31, you’re the prime audience. But also if you’re a shop that takes in military surplus Moxy trucks, or a home mechanic who bought one at auction, this is the document that pays for itself the first time you avoid a stripped thread. Beginners should start with Chapter 0 – read every safety note before you even raise the body. Pros will skip straight to the torque charts and wiring schematics. Either way, you’re not guessing.

Source Validity: Why Aftermarket Manuals Don’t Cut It

I’ve been ASE Master since ’96. I’ve seen aftermarket manuals that show the wrong oil capacity for the MT 31 transmission, or omit the procedure for bleeding the air‑over‑hydraulic brakes. This is the OEM manual – MOXY Part No. 512967, Edition December 2004. It’s the same document the factory ships with every new truck. If you want to know why the workshop safety section dedicates a whole subsection (0.2.2) to vibrations, it’s because the engineers wrote it from real shop experience. That’s not filler, that’s credibility.

Frequently Asked Questions

Does this manual cover both the MT 26 and MT 31?

Yes. The title says MT 26/MT 31 and the table of contents applies to both models. Same driveline, same hydraulic system – only the payload capacity differs.

Can I print this PDF?

The file is a standard PDF. You can print any page you need. I keep a binder with Chapter 0 and the hydraulic section on my bench.

Are torque specs included for all fasteners?

Section 0.2.19.2 gives torque limits for screws. For specific assemblies like the engine or transmission, the torque values are listed in the respective chapter – not just the general table. That way you always know the correct spec for that particular joint.

What about wiring diagrams – are they in color?

The original manual uses black-and-white line drawings with component callouts. Wire colors are indicated by labels (e.g., “GN/RD” for green/red). It’s readable and accurate – I’ve used it to trace a short in the cab harness on an MT 31 without any trouble.

You’ve read enough. If you’re working on a Moxy dump truck, you need the real book – not some re‑typed copy from a third party. Get the factory manual with all 931 pages, every spec, every warning, every diagram. Access the Factory Manual now and keep it on your tablet or print it out. Your truck – and your knuckles – will thank you.

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For a refresher on manual transmission fundamentals, check the Wikipedia article on Manual Transmission. And if you want to see the torque converter removal procedure in action, watch this Manual Transmission video – it’s not the same truck, but the principles apply.