Mitsubishi FD120N Forklift Service Manual (99799-53100)

This FD120N is a big diesel counterbalanced yard truck, the kind that lives on docks, mills, steel yards, or heavy warehouses. Around my shop, this is the manual you grab when the truck is down and you actually have to fix something, not just clear a code. You'll use it when you're deep in the power train, chasing a hydraulic issue, or trying to make sense of the electrical on an older Mitsubishi that's out of dealer support.

What this manual helps you do

• Diagnose hydraulic problems, check pressures, and trace leaks on mast, tilt, and auxiliary functions
• Follow step-by-step teardown and reassembly of the diesel engine, transmission, and drive axle
• Trace, test, and repair wiring and sensors using full electrical and hydraulic schematics
• Adjust brakes, steering, and inching so the truck stops straight and drives the way it should
• Troubleshoot fault symptoms with specs, test points, and service data for the FD120N series

Who this is for

This is aimed at plant maintenance, rental fleet mechanics, dealer techs, and independent shops that actually wrench on FD120N trucks. If you only need operating instructions or basic daily checks, you want the operator's handbook, not this.

FAQ

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

A: You get 27 PDF files, split by section. They are searchable, and the wiring and hydraulic diagrams are clear enough to zoom in and read on screen.

Q: Will this cover my truck's serial number?

A: It's written for FD120N trucks from serial F15D-60011 and up. If your plate shows FD120N and a serial at or above that, this is the right family.

Q: Is this the right document if I'm doing a full repair?

A: Yes. This is the workshop service manual, meant for teardown, adjustment, and troubleshooting, not parts lookup or operator training.

Bottom line: If you're maintaining or repairing an FD120N in the F15D-60011-up range, this is the right manual. If your truck is a different model or class, it isn't.

Models covered by this manual

Mitsubishi publication 99799-53100 is the factory service manual for the FD120N, serial range F15D-60011-up. The same publication covers 5 further forklift models: FD135N, FD150AN, FD150N, FD160AN, FD160N. Check the model and serial number on your data plate before ordering.

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