Caterpillar GC25 Forklift LPG Service Manual (99729-85100)

A Cat GC25 keeps pallets moving across the warehouse, loading bays, and yard. When an LPG truck is down during second shift, the maintenance tech needs fuel-system procedures, not an operator handbook. This manual is the LPG service supplement for GC25 trucks using the listed 4G63, 4G64, and 6G72 engine applications, with the engine service manual as its companion.

What this manual helps you do

• Trace LPG fuel flow from the tank through the lines, converter, regulator, and mixer.
• Check and adjust the LPG converter, regulator, and mixer during fault finding.
• Diagnose hard starting, poor running, fuel delivery problems, and LPG system faults.
• Follow removal, inspection, servicing, and replacement procedures for fuel-system parts.
• Verify system operation after repair and return the truck to service safely.

Who this is for

This suits a warehouse maintenance tech, dealer technician, independent forklift repair shop, or rental fleet mechanic working on Cat GC25 LPG trucks. The engine service manual covers the engine end of the job, while the companion chassis manual, also available, covers truck systems such as hydraulics, steering, brakes, and the mast.

FAQ

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

A: You receive 16 PDF files split by section, with 79 pages total. The files carry a real text layer, so you can search and copy text, as well as print or zoom the repair information.

Q: Will it fit my GC25 variant?

A: The manual cover identifies 4G63, AA0001-ZZ9999, 4G64, 6G72, 0A0001-0Z9999, and 4G63 applications. Match those identifiers to the truck before starting work.

Q: Is this the right book for an LPG fuel-system repair?

A: Yes. It is the workshop book for LPG fuel-system work, including the tank and lines, converter, regulator, and mixer. That's the trade this manual is built for.

Use it to trace faults, service the LPG system, and get a GC25 back from the aisle before the next wave.

Models covered by this manual

Caterpillar publication 99729-85100 is the factory lpg service manual for the GC25. The same publication covers 6 further forklift models: GC15, GC18, GC20, GC20HP, GC25HP, GC30. The cover also lists 4G63, AA0001-ZZ9999, 4G64, 6G72, 0A0001-0Z9999, 4G63,. Check the model and serial number on your data plate before ordering.

Table of Contents:

• 99729-85100 – LPG Supplement Service Manual
  • Foreword
  • Types of LP-Gas
  • Structure and Function
  • Actions to Be Taken in the Event of a Failure
  • Pre CARB Troubleshooting
  • Pre CARB Disassembly and Reassembly
  • Pre CARB Inspection and Adjustment
  • CARB Tier 1 Emissions Control System
  • Systems Operation
  • System Adjustments
  • S-15G Fuel System Troubleshooting
  • Schematics
  • Inspection and Adjustment

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