Caterpillar GP18NM Forklift Engine Service Manual (99789-87100)

A Cat GP18NM is a counterbalanced forklift used to move loads around the warehouse, plant, or yard. This manual is for the technician working on the engine end of that truck, especially when the repair has to be done in-house during a short maintenance window. It is the engine book of the set, with engine specifications, system operation, testing and adjustment, disassembly and assembly procedures, torque values, and clearances. The companion chassis manual, also available, covers the truck chassis, mast, hydraulics, and other truck systems.

What this manual helps you do

• Trace engine system operation and fault symptoms before tearing into the assembly.
• Check test points, adjustments, clearances, and service data during diagnosis.
• Follow procedures to remove, disassemble, inspect, and assemble engine components.
• Verify fuel, cooling, lubrication, starting, and charging system operation.
• Set adjustments and torque fasteners correctly during engine repair and rebuild work.

Who this is for

This suits a plant maintenance technician, warehouse maintenance tech, dealer technician, independent forklift repair shop, or rental fleet mechanic. In my experience, it's the book you reach for when a used truck arrives with little paperwork and the shop needs a proper engine repair reference.

FAQ

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

A: You receive 9 PDF files split by section, with 230 pages total. The files carry a real text layer, so you can search the manual and copy text for work notes.

Q: Does it fit my GP18NM or related truck?

A: Yes. The cover identifies K15, K21, and K25 engines, plus GP15N-GP35N and GPE15N-GPE35N trucks, which includes the GP18NM range.

Q: How does it fit the repair job?

A: It gives the workshop procedures and service data for engine diagnosis, adjustment, teardown, and rebuild work. That gives you a practical reference for completing engine repairs safely and correctly.

Use it to identify the engine system, confirm the service procedure, and carry out the repair with the required workshop data in front of you.

Models covered by this manual

Caterpillar publication 99789-87100 is the factory engine service manual for the GP18NM. The same publication covers 17 further forklift models: GP15ND, GP15NM, GP15NT, GP18ND, 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

Caterpillar Software

Caterpillar PDF Manuals