Caterpillar GP15NM Forklift Engine Service Manual (99789-87100)

A Cat GP15NM is a counterbalanced LPG or gasoline forklift for moving pallets, materials, and loads around a warehouse or yard. When the engine needs testing, adjustment, teardown, or rebuilding, this is the book a shop technician reaches for. It is the engine book of the set, while chassis, mast, hydraulic, steering, and brake work is covered in the companion chassis manual, also available.

What this manual helps you do

• Check engine specifications, system operation, and service data before starting work.
• Diagnose running, starting, fuel, cooling, lubrication, and electrical engine faults.
• Follow testing and adjusting procedures for workshop repairs.
• Rebuild engine assemblies with disassembly and assembly instructions.
• Verify torque values, clearances, and adjustment requirements during reassembly.

Who this is for

This suits a warehouse maintenance tech, dealer technician, independent forklift shop, or rental fleet mechanic working on Cat GP-series trucks. It is a proper workshop manual, not an operator handbook or parts catalog, and it fits the engine side of the forklift trade.

FAQ

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

A: You receive 9 PDF files split by section, totaling 230 pages. The set can be searched and copied because it has a real text layer, and the pages can be viewed, zoomed, or printed for shop use.

Q: Does it fit my GP15NM?

A: Yes. Publication 99789-87100 covers K15, K21, and K25 engines used across GP15N-GP35N and GPE15N-GPE35N trucks, including the GP15NM family.

Q: Is this useful for the repair job I'm doing?

A: Yes, when the job involves engine diagnosis, adjustment, service testing, or internal repair. It gives the specifications and workshop procedures needed to take the engine from fault-finding through reassembly.

For engine work on a GP15NM, this is the manual to have open at the bench or on the service laptop.

Models covered by this manual

Caterpillar publication 99789-87100 is the factory engine service manual for the GP15NM. The same publication covers 17 further forklift models: GP15ND, GP15NT, GP18ND, GP18NM, GP18NT, 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
  • Specifications
  • Precautions
  • Lubrication System
  • Engine Outside Drawings
  • Adjustment Value

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