Caterpillar GP18 Forklift Service Manual (99719-34130)

On the floor or yard, a Cat GP18 is a counterbalanced gasoline or LPG forklift used for pallet work, loading, and general plant handling. Around my shop, this is the book a maintenance tech or independent forklift mechanic reaches for when the truck needs diagnosis, adjustment, or repair. It covers GP15-35, GP15K-35K, GP40, GPL40, GC15-30, GC15K-30K, and GC35K-70K models, including the GP18.

What this manual helps you do

• Trace electrical circuits, switches, wiring, and starting or charging faults.
• Check hydraulic, brake, steering, cooling, and powershift system operation.
• Follow removal, inspection, adjustment, and installation procedures for truck components.
• Diagnose drive, lift, steering, and control complaints using service data and troubleshooting steps.
• Rebuild or replace assemblies such as the mast, front axle, transmission, hydraulic components, and engine-related parts.

Who this is for

This suits a warehouse maintenance tech, dealer technician, rental fleet mechanic, or independent forklift repair shop. It is a workshop service manual for the forklift trade, with the operator handbook available as the companion volume for daily operation and controls.

FAQ

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

A: You receive five Cat publications in 72 PDF files, split by section, with 352 pages total. The PDFs can be printed and zoomed, and this set has a real text layer for searching and copying text.

Q: Does it fit my Cat GP18 variant?

A: Yes. GP18 falls within the listed GP15-35 coverage, alongside the other Cat model groups identified above. That gives you the relevant model family reference in one set.

Q: How does this fit the repair job?

A: Use it for shop-level troubleshooting, teardown, adjustment, inspection, and reassembly work. The set brings the chassis and matching engine material together, so you can work from diagnosis through repair.

For a Cat GP18 in the listed model family, this is the service set I'd buy before tearing into the truck.

Models covered by this manual

Caterpillar publication 99719-34130 is the factory service manual for the GP18. The same publication covers 11 further forklift models: GP15, GP15 MC, GP18 MC, GP20, GP20 MC, GP25, GP25 MC, GP30, GP30 MC, GP35, GP35 MC. The cover also lists 4G15, 4G63, 4G64, 6G72, GP15-35,, GP15K-35K,, GP40,, GPL40,, GC15-30,, GC15K-30K,, GC35K-70K. Check the model and serial number on your data plate before ordering.

Table of Contents:

• Screw
• Secondary cover
• Screw
• Secondary seat lever
• Fulcrum pin
• Spring
• Converter body
• Primary valve seat
• Cover plate
• Spring
• Primary cover
• Screw
• Solenoid valves (electromagnetic valves)
• Switching from [LP-gas] to [gasoline]
• Switching from [gasoline] to [LP-gas]

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