Mitsubishi FG25NM Forklift Engine Service Manual (99789-77100)

This is the ENGINE service manual for a Mitsubishi FG25NM LPG forklift, not the full truck manual. On a real shop floor you'll use it when the truck runs poorly, throws engine-related codes, or needs deeper work than filters and plugs. Techs grab this when they're chasing fuel/ignition problems, low power, hard starts, or doing top-end / bottom-end repairs. It's the book you want when you need the correct procedures and specs to keep an FG25NM engine reliable and inside warranty standards, even if the truck itself is out of warranty.

What this manual helps you do

• Diagnose hard-start, misfire, low-power, and stalling complaints on the FG25NM engine
• Check and adjust engine-related settings like ignition timing, valve train, and throttle components
• Follow step-by-step procedures to remove, strip, and rebuild the engine and its bolt-on components
• Troubleshoot engine-related fault codes and sensor issues in a structured, by-the-book way
• Verify engine-related pressures, clearances, and test values against the correct FG25NM data

Who this is for

This is for a warehouse maintenance tech, dealer technician, independent shop, or rental fleet mechanic doing engine diagnostics or overhaul on an FG25NM. If you need mast, hydraulic, axle, or steering information, or just operating instructions, this is the wrong book; you'd want the chassis service manual and the operator's handbook instead.

FAQ

Q: What format is it in, and can I search it or read diagrams clearly?

A: It's a set of 9 PDF files with a real text layer, so you can search and copy text. Diagrams are in the PDFs and are readable on a normal laptop or tablet.

Q: Will this cover my FG25NM by serial number or variant?

A: It's written for the FG25NM engine family in general. For edge-case serial breaks or special options you may need to confirm against your truck's data plate or dealer info.

Q: Is this the right document if I'm chasing a hydraulic or mast issue?

A: No. This is the ENGINE service manual only. For mast, hydraulics, steering, transmission, or brakes, you need the separate chassis service manual.

Bottom line: If you're working specifically on the FG25NM engine, this is the right manual. If you need whole-truck coverage, this alone is not enough.

Models covered by this manual

Mitsubishi publication 99789-77100 is the factory service manual for the FG25NM. The same publication covers 6 further forklift models: FG15NM, FG18NM, FG20CNM, FG20NM, FG30NM, FG35NM. Check the model and serial number on your data plate before ordering.

Table of Contents:

• Foreword
• General Information
• Maintenance
• Tune Up
• Mechanical
• Control
• Lubrication and Cooling
• Fuel
• Electrical

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