Caterpillar GC20 Forklift LPG Service Manual (99729-85100)

This Cat GC20 is a counterbalanced LPG forklift for moving pallets around warehouse aisles, loading areas, and yard work. When a gas-fuel truck is down on second shift, the maintenance tech reaches for this manual to find the fuel-system fault and return it to service. It is the LPG service supplement for the engine service manual, covering the gas side of the truck.

What this manual helps you do

• Trace LPG flow through the tank, lines, shutoff components, converter, regulator, and mixer.
• Check fuel-system components during hard starting, stalling, poor running, or loss of power.
• Follow removal, inspection, adjustment, and installation procedures for LPG equipment.
• Diagnose faults in the converter, regulator, mixer, and related fuel connections.
• Verify the LPG system after repair before putting the truck back into the aisle.

Who this is for

This suits warehouse maintenance techs, plant maintenance teams, dealer technicians, independent forklift shops, and rental fleet mechanics working on Cat GC20 trucks. The trade is LPG forklift fuel-system repair; 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 carry a real text layer, so you can search and copy text, print pages, and zoom in during workshop work.

Q: Will it fit my truck variant?

A: The cover identifies 4G63, 4G64, and 6G72 applications, including AA0001-ZZ9999 and 0A0001-0Z9999 serial coverage. That gives you a direct match point for the GC20 and its listed engine applications.

Q: What job is this document for?

A: Use it for LPG fuel-system diagnosis and repair, including the converter, regulator, mixer, tank, and lines. It gives the gas-fuel side of the engine service job in workshop form.

Use it to troubleshoot the LPG system, carry out repairs, and get a GC20 back before the next wave of work.

Models covered by this manual

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