Caterpillar GP55N1 Forklift Service and Schematic Manual (99739-8B120)

This Cat GP55N1 is a counterbalanced truck used to move palletised loads around a warehouse, plant, or yard. The service manual is for the technician repairing it, checking faults, and returning it to service by the book. If your truck is a GP55N1 in the stated serial range, yes, this is the correct workshop set.

What this manual helps you do

• Trace wiring faults through electrical schematics and test circuits.
• Diagnose alarm codes, controller issues, and operating faults.
• Check service intervals, adjustments, pressures, and other service data.
• Follow procedures for the power train, transmission, axles, brakes, steering, hydraulics, mast, and forks.
• Rebuild or replace truck and engine assemblies using workshop procedures.

Who this is for

This suits a warehouse maintenance technician, dealer technician, independent forklift repair shop, rental fleet mechanic, or plant maintenance team. It is written for the forklift repair trade, with the operator handbook available as the companion volume for daily operation.

FAQ

Q: What do I receive, and how is it organised?

A: You receive 15 PDF files, split by section, with 657 pages total. The set carries a real text layer, so you can search and copy text, then print or zoom the relevant pages at the bench.

Q: Which trucks and serials does it cover?

A: It covers GP40N1, DP40NM1, GP45N1, DP45NM1, GP50CN1, DP50CNM1, GP50N1, DP50NM1, GP55N1, DP55NM1, and TB45. For GP55N1, the printed coverage is AT33C-82011-up.

Q: How does it fit the repair job?

A: This is a three-publication set covering the truck service material, matching engine material, and supplements. It gives your shop the procedures and schematics used for fault-finding, planned maintenance, and repairs.

For the listed GP55N1 serial range, this is the service set to use when the truck needs measured, documented workshop work.

Models covered by this manual

Caterpillar publication 99739-8B120 is the factory service and schematic manual for the GP55N1, serial range AT33C-82011-up. The same publication covers 7 further forklift models: DP45NM1, DP50CNM1, DP50NM1, DP55NM1, GP45N1, GP50CN1, GP50N1. The cover also lists GP40N1, DP40NM1, TB45. Check the model and serial number on your data plate before ordering.

Table of Contents:

• 99739-8B120 – Chassis & Mast Service Manual
  • Foreword
  • General Information
  • Cooling System
  • Electrical System
  • Electrical Schematics
  • Controllers
  • Power Train
  • Powershift Transmission
  • Front Axle and Reduction Differential
  • Rear Axle
  • Brake System
  • Steering System
  • Hydraulic System
  • Mast and Forks
  • Service Data

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