Caterpillar GP18NT Forklift Engine Service Manual (99789-87100)

If you're maintaining a Cat GP18NT on a warehouse floor or loading yard, this is the engine service manual for the truck. Plant maintenance technicians, dealer technicians, and independent forklift shops use it when they need to test, adjust, repair, or rebuild an engine during a short repair window. For a GP18NT, the answer is yes: GP18NT falls within the GP15N-GP35N coverage shown on the manual cover. This is the engine book of the set; chassis and mast work is in the companion chassis manual, also available.

What this manual helps you do

• Check engine specifications, service data, torque values, and clearances.
• Trace fuel, cooling, lubrication, starting, and related engine systems.
• Follow testing and adjusting procedures to confirm an engine fault.
• Diagnose running, starting, overheating, and performance problems.
• Rebuild engine assemblies with disassembly and assembly procedures.

Who this is for

This suits a warehouse maintenance tech, plant maintenance lead, rental fleet mechanic, dealer technician, or independent forklift repair shop. It is a workshop service manual for the engine trade, while the operator handbook and companion chassis manual cover their respective jobs.

FAQ

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

A: You receive 8 PDF files split by section, 210 pages total. The set has a real text layer, so you can search and copy text, print it, and view it enlarged during shop work.

Q: Does it fit my truck variant?

A: Yes, for a Cat GP18NT. The cover identifies K15, K21, K25, GP15N-GP35N, and GPE15N-GPE35N models, which places the GP18NT in the stated GP range.

Q: How does it fit the repair job?

A: Use it for engine specifications, system operation, testing, adjustment, teardown, assembly, torque values, and clearances. It gives a mechanic the workshop reference needed to plan and complete engine repairs.

For a GP18NT engine repair, this is the manual to have on the bench during diagnosis and rebuild work.

Models covered by this manual

Caterpillar publication 99789-87100 is the factory engine service manual for the GP18NT. The same publication covers 17 further forklift models: GP15ND, GP15NM, GP15NT, GP18ND, GP18NM, GP20CND, GP20CNT, GP20ND, GP20NM, GP20NT, GP25ND, GP25NT and 5 more. The cover also lists K15,, K21,, K25, K15, K21, GP15N-GP35N,, GPE15N-GPE35N. Check the model and serial number on your data plate before ordering.

Table of Contents:

• 99789-87100
  • How To Use This Manual
  • Engine Maintenance
  • Precautions
  • Lubrication System
  • Engine Outside Drawings
  • Adjustment Value

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