Caterpillar GC25HP Forklift LPG Service Manual (99729-85100)

A Cat GC25HP is a counterbalanced LPG truck for moving pallets around a warehouse, loading area, or yard. When the gas system is causing hard starting, poor running, or fuel delivery trouble, this is the book a maintenance tech or repair shop reaches for. It is the LPG fuel-system supplement used with the engine service manual, covering the converter, regulator, mixer, tank, and fuel lines.

What this manual helps you do

• Trace LPG fuel flow from the tank through the lines and fuel-system components.
• Check the converter, regulator, and mixer during service and fault finding.
• Follow adjustment procedures for gas delivery and engine fuel operation.
• Diagnose starting, running, and fuel-system complaints on the covered trucks.
• Pressure-test and service the tank, lines, and LPG control components.

Who this is for

This suits a warehouse maintenance technician, dealer technician, independent forklift shop, plant mechanic, or rental fleet mechanic handling LPG truck repairs. It is a workshop manual for gas-fuel-system work, while the engine service manual and the companion chassis manual, also available, cover their respective truck systems.

FAQ

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

A: You receive 16 PDF files split by section, totaling 79 pages. The files carry a real text layer for searching and copying, and they are suitable for screen zoom and printing.

Q: Which trucks does it fit?

A: The cover identifies 4G63, 4G64, and 6G72 applications, with AA0001-ZZ9999 and 0A0001-0Z9999 shown. That makes it the relevant LPG reference for the listed GC25HP truck family.

Q: How does it fit the repair job?

A: Use it when the job involves LPG fuel delivery, regulation, mixing, tank connections, or fuel-system troubleshooting. It gives the shop a direct service reference instead of relying on guesswork.

For a GC25HP LPG fuel-system repair, this is the manual to have beside the truck while testing, adjusting, and servicing the gas system.

Models covered by this manual

Caterpillar publication 99729-85100 is the factory lpg service manual for the GC25HP. The same publication covers 6 further forklift models: GC15, GC18, GC20, GC20HP, GC25, 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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