Caterpillar DP20NM Forklift Service Manual (99729-80100)

A Cat DP20NM is a diesel counterbalanced lift truck for moving pallets and materials around a warehouse, plant, or yard. This manual is for the mechanic turning that truck around, chasing a fault, or completing scheduled maintenance before the next rental. It gives workshop procedures for the truck systems, while engine-specific work is handled in the companion engine service manual, also available.

What this manual helps you do

• Trace electrical faults through wiring and truck circuits.
• Check and adjust the power train, transmission, axles, brakes, steering, and hydraulics.
• Follow removal and installation procedures for the mast, forks, and hydraulic components.
• Diagnose operating problems using service data and troubleshooting guidance.
• Rebuild or replace major truck assemblies with the correct service sequence.

Who this is for

This suits a rental fleet mechanic, warehouse maintenance tech, plant maintenance team, dealer technician, or independent forklift repair shop. It is a workshop service manual for the forklift trade, with the operator handbook and companion engine manual also available for day-to-day operation and engine work.

FAQ

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

A: You receive 17 PDF files split by service section, with 840 pages total. The files support printing and zooming, and the set has a real text layer for searching and copying text.

Q: Will it fit my DP20NM?

A: Yes, when the truck is a DP20NM within serial range AT18D-00012-49999. Publication 99729-80100 also lists the related GP and DP models shown on the manual cover, which helps when matching fleet equipment.

Q: Is this the right book for a repair job?

A: Yes, if you're diagnosing, adjusting, removing, or rebuilding truck systems rather than simply operating the machine. It gives the workshop reference needed for scheduled maintenance and repair decisions.

If your identification plate matches the DP20NM and serial range, this is the book to put beside the truck before the next job. You can work from fault diagnosis through teardown, adjustment, and return-to-service checks.

Models covered by this manual

Caterpillar publication 99729-80100 is the factory service manual for the DP20NM, serial range AT18D-00012-49999. The same publication covers 3 further forklift models: DP25NM, DP30NM, DP35NM. The cover also lists GP15N, GP18NM, GP18N, GP20CNM, GP20CN, GP20NM, GP20N, GP25NM, GP25N, GP25NMA, GP28N, GP28NM, GP30N, GP30NM, GP33N, GP33NM. Check the model and serial number on your data plate before ordering.

Table of Contents:

• 99729-80100
  • General Information
  • Cooling System
  • Electrical System
  • Controllers
  • Power Train
  • Powershift Transmission
  • Front Axle And Reduction Differential
  • Rear Axle
  • Brake System
  • Steering System
  • Hydraulic System
  • Mast And Forks
  • Service Data
  • Lift Link Telematic Control Unit
  • How To Read Circuit Diagrams

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