Mitsubishi FG20NM Forklift Engine Service Manual (99789-77100)

On the floor this Mitsubishi FG20NM is a small LPG counterbalance truck that lives on docks, in plants, and in rental fleets. People grab the service manual when the truck is out of warranty, a fault code pops up, or an engine problem is about to ruin tomorrow's schedule. They need clear specs and procedures so an engine issue gets fixed once and the truck goes back on rent without comebacks. This specific book is the engine service manual only, not the full truck/chassis manual.

What this manual helps you do

• Diagnose rough running, hard start, or no-start problems on the FG20NM LPG engine
• Check and set engine-related adjustments using the correct specs and sequences
• Follow step-by-step teardown and rebuild procedures for the engine and its bolt-on components
• Troubleshoot engine-related fault codes and performance complaints before you start throwing parts at it
• Verify engine-related pressures and measurements after repairs so you know it's good to send back out

Who this is for

This is for warehouse maintenance techs, dealer techs, independent forklift shops, and rental fleet mechanics who need to repair or overhaul the FG20NM engine in the shop. If you need mast, axle, steering, or hydraulic procedures, or basic operating instructions, this is the wrong book and you'll want the chassis service manual or the operator's handbook instead.

FAQ

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

A: You get 9 PDF files with a real text layer, so you can search and copy text. Engine diagrams and schematics are clear enough to zoom in on.

Q: Will it cover my exact serial number or variant?

A: It's written for the FG20NM engine family. For edge-case serial breaks or special builds, you'd confirm coverage with your truck's data plate and dealer.

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

A: No. This is engine only. For mast, hydraulics, axles, or brakes you need the separate truck/chassis service manual.

Bottom line: If your problem is inside or bolted to the FG20NM engine, this is the right manual. If your problem is anywhere else on the truck, it isn't.

Models covered by this manual

Mitsubishi publication 99789-77100 is the factory service manual for the FG20NM. The same publication covers 6 further forklift models: FG15NM, FG18NM, FG20CNM, FG25NM, 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

Mitsubishi Software

Mitsubishi PDF Manuals