Caterpillar GC15 Forklift LPG Service Manual (99729-85100)

A Cat GC15 is a counterbalanced LPG truck for moving pallets and materials around the plant, warehouse, or yard. When a gas-fuel problem stops the truck, maintenance staff reach for this manual to trace the system, set it up safely, and return the truck to service. I've used books like this during short repair windows, when the diagnosis needs to be right the first time.

What this manual helps you do

• Trace LPG fuel flow from the tank through the lines, converter, regulator, and mixer.
• Check and service the LPG converter and regulator during fuel or starting faults.
• Diagnose mixer and fuel-system problems using the manual's service procedures and data.
• Adjust LPG system components after repair or replacement.
• Verify safe fuel-system work before returning the GC15 to floor or yard duty.

Who this is for

This suits a plant maintenance technician, warehouse mechanic, dealer technician, independent forklift shop, or rental fleet mechanic working on LPG-powered Cat trucks. It is the LPG fuel-system trade manual, and the companion engine and chassis manuals are also available for the rest of the truck.

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 can be printed and zoomed, and the set has a real text layer for searching and copying text.

Q: Which truck variant does it fit?

A: The cover identifies 4G63, 4G64, and 6G72 applications, with the listed identifiers AA0001-ZZ9999 and 0A0001-0Z9999. Match your GC15's engine and identification to those cover details before starting work.

Q: How does it fit the repair job?

A: This is the book for LPG fuel-system work, including the tank, lines, converter, regulator, and mixer. The engine manual is the published companion for engine service, while the chassis manual covers truck systems such as hydraulics, mast, brakes, and steering.

For a GC15 with the listed LPG engine application, this is the manual to have at the bench when diagnosing and repairing the gas fuel system.

Models covered by this manual

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