MOXY MT25, MT26, MT31 2003 Operators Manual

You bought a used MOXY MT25, MT26, or MT31 articulated dump truck. It runs, but the instrument cluster has two lights you don’t recognize. The fuel filter housing leaks after you changed it. The previous owner left a stack of aftermarket photocopies that don’t match your serial number. That’s where this Operators Manual – the real 2003 factory print – stops the guessing. I’ve seen too many guys overspeed a retarder because they skipped page 34 on engine overspeed procedures. This book, all 212 pages, keeps you out of that kind of trouble.

Safety Instructions: 28 Sections That Cover the Real Hazards

Chapter 2 runs from page 9 to 40 and isn’t generic OSHA boilerplate. It tells you specifically how to handle a MOXY dump truck: precautions before starting the engine, fuel and oil filling rules, battery hazard prevention, emergency steering, and the procedure for engine overspeed (emergency retarder). Pay attention to section 27 – high-pressure systems. If you weld on the frame without disconnecting the articulation lock (section 24), you’ll fry the controller. That’s an expensive mistake this manual catches before you make it.

Operating Controls: Know Which Warning Light Means What

Pages 41–78 cover every switch, indicator, and warning light on the MT25, MT26, and MT31 dash. The cab ventilation and tiltable cab controls are diagrammed. If your dump truck has a top tailgate (section 18), the manual shows the hydraulic release procedure. No guesswork – you look at the illustration, find the part, and act.

Engine and Fuel: Starting, Cold Weather, and Troubleshooting

Chapter 5, Operating Instructions, includes step‑by‑step starting procedure (page 88), cold‑weather operation (section 8), and long-term storage. The troubleshooting section on page 113 lists common engine and fuel system issues – no starts, low power, black smoke – with the factory-recommended check sequence for the MOXY injection pump and filters. If you live where winter temps drop below freezing, the cold‑weather section tells you the correct coolant mix and battery power assistance steps. That’s real money saved.

Lubricants and Maintenance: 4000‑Hour Schedule with Filling Capacities

Chapter 6 (pages 121–128) gives the lubrication schedule, oil specification sheet, and filling capacities for transmission, hydraulic system, and fuel tank. Chapter 7 breaks maintenance into daily (8‑hour), weekly (40‑hour), and interval services up to 4000 hours. Each service lists exactly what to check and torque – no aftermarket approximations. The manual even includes transmission oil list for the ZF gearbox. Use the wrong spec and you’ll burn clutches. This manual gives the right viscosity and API category.

Technical Data: Torque Limits and Performance Charts

Chapter 8 – you want specs? It has engine measurements, transmission ratios, hydraulic system pressures, air system diagrams, tyre pressures (in PSI, imperial), electrical system layout, metering conversion table, tool kit content, performance chart, engine and retarder brake capacity chart, and torque limits for bolts – all factory values. Need the head bolt torque for the MT31? Page 193 (torque limits section) lists it in ft‑lb. I trust factory torque specs over aftermarket data every time. That chapter also includes the periodic service table – cross‑reference your hour meter and get the job done.

Who Should Own This Manual and Why It Matters

If you operate, maintain, or own a MOXY MT25, MT26, or MT31 – whether on a jobsite, quarry, or farm – you need the original OEM documentation. Aftermarket reprints often omit the “precautions before starting the engine” or mess up the wiring colors. This 2003 manual is the exact source the dealer tech used. One real‑world use: a customer had a parking brake that wouldn’t release. Manual section 13, “Manual release of parking brake,” gave the exact hydraulic port to open. Fifteen minutes, done. No trial and error.

Source Authenticity: OEM Print, Not Aftermarket Copy

AutoRepairManuals carries the largest collection of OEM shop manuals in North America. This 2003 Operators Manual is scanned from the original factory binder – not a reprint with missing pages. Every section number matches the physical book. Aftermarket manuals often combine models with wrong diagrams; this one keeps MT25, MT26, and MT31 separate where needed. I’ve seen enough electrical fires from aftermarket wire schematics to know better.

Frequently Asked Questions

Does this manual cover the fuel injection pump timing for the MT26?

Yes. Chapter 5 – Troubleshooting on page 113 includes fuel system checks, but for pump timing specs refer to Chapter 8 Technical Data under “Engine” measurements. The manual does not include full rebuild instructions – that’s in the Service Repair Manual – but it does give the correct fuel filter part numbers and bleeding procedure.

What torque values are given for the wheel nuts?

See page 193 – Torque limits for bolts. Wheel nut torque is listed in ft‑lb.

You’ve got a MOXY that needs operation or maintenance guidance. Stop relying on forum posts and faded notes. Download the Factory Manual now and put the correct procedures on your workbench. The money you save on one misdiagnosis will pay for it.

Related manuals: MOXY MT25, MT26, MT31, MT36, MT41 2007 Operators Manual – Factory Specs, Moxy MT41 Operating & Maintenance Manual 2004, Moxy MT36 Series II Operator & Maintenance Manual. For general transmission knowledge, see Manual Transmission and Manual Transmission.