Mitsubishi RB20K Reach Truck Service Manual (WHSM0060)

This RB20K reach truck is what you see living in the narrow aisles, pulling pallets three levels up and shuttling them to shipping without ever leaving the rack run. The service manual is what you grab on a dead truck that's blocking an aisle, throwing Zapi faults, or dropping reach mid-shift. Around my shop, this is the book that comes out when you're past basic checks and you actually have to open something up, meter it, or reset it right the first time so it survives the next rush.

What this manual helps you do

• Diagnose Zapi controller and drive system faults using alarm codes and TruckTool procedures
• Trace and check wiring on the truck, from battery and contactors through traction, steer, and pump circuits
• Follow step-by-step teardown and rebuild work on the mast, reach carriage, and pantograph assemblies
• Adjust and verify hydraulic pressures, lift and reach functions, and mechanical clearances after repairs
• Troubleshoot, set, and verify truck parameters and safety interlocks after component replacement or software changes

Who this is for

This is aimed at warehouse maintenance techs, dealer techs, independent forklift shops, and rental fleet mechanics who are actually turning wrenches on an RB20K. If you just need to learn how to drive it or explain pre-shift checks to operators, you want the operator's handbook instead, not this manual.

FAQ

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

A: It's a set of 11 PDF files with a real text layer, so you can search and copy text. The wiring diagrams are in the PDFs as well, split by section.

Q: Will this cover my exact RB20K serial number or variant?

A: It's written for the Mitsubishi RB20K reach truck family in general. For edge-case variants, you may still want to confirm against your truck's data plate.

Q: Is this the right document if I'm doing my own repairs out of warranty?

A: Yes. This is the workshop-level service manual, not a parts book or operator's manual.

Bottom line: if you're wrenching on a Mitsubishi RB20K reach truck and need real repair and diagnostic info, this is the right manual. If you're just operating the truck, it isn't.

Models covered by this manual

Mitsubishi publication WHSM0060 is the factory service manual for the RB20K. The same publication covers 9 further reach truck models: RB14K, RB14KC, RB14KE, RB14XC, RB14XE, RB16K, RB16KC, RB16KN, RB25KH. Check the model and serial number on your data plate before ordering.

Table of Contents:

• Circuit diagrams
• Circuit diagrams: Cold store modifications
• Parameters: Traction controller – Zapi AC-2 Traction inverter 48V 350A RO 0.16 Adjustment instructions
• Parameters: Pump controller – Zapi AC-2 Pump inverter 48V 350A RO 0.16 Adjustment instructions
• Parameters: Steer controller – Zapi EPS AC 48V 40A (50A) RO 1.02-1.03 Adjustment instructions
• Parameters: Valve controller – Zapi MHYRIO 48V RO 1.07 Adjustment instructions
• Parameters: Display controller – Zapi SICOS RO 1.04-1.08 Adjustment instructions
• Manual: Traction & Pump controller – Zapi AC-2 User manual
• Manual: Steer controller – Zapi EPS AC User manual
• Manual: Valve controller – Zapi MHYRIO User manual
• Manual: Master/Display controller – Zapi SICOS User manual

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