Caterpillar DP120N Forklift Service Manual (99799-63100)

A Cat DP120N is a diesel counterbalanced lift truck for moving and stacking loads around a warehouse, plant, or yard. This service manual is for the technician diagnosing faults, carrying out scheduled service, and repairing the truck by the book. It suits work where torque data, pressure checks, alarm codes, controller parameters, and adjustment procedures need to be recorded and audited.

What this manual helps you do

• Trace electrical faults through wiring diagrams and control circuits.
• Check service intervals, system readings, and operating adjustments.
• Diagnose alarm codes and truck performance problems.
• Follow procedures for the power train, axles, brakes, steering, hydraulics, mast, and forks.
• Rebuild or adjust truck and engine assemblies using the correct workshop sequence.

Who this is for

This is for warehouse maintenance technicians, plant maintenance staff, dealer technicians, independent forklift shops, and rental fleet mechanics. It suits the forklift repair trade, especially shops handling diesel counterbalanced trucks. The operator handbook is the companion volume for daily operation and driver instructions.

FAQ

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

A: You receive two separate Cat publications in 27 PDF files, split by section, with 862 pages total. The pages can be printed or enlarged on screen, and the text layer allows searching and copying.

Q: Which trucks and serials does it fit?

A: It covers Cat DP100N, DP120N, DP135N, DP150N, and DP160N models. For the DP120N, the printed serial coverage is T37A-10011-up.

Q: How does it fit the job I'm doing?

A: It is a workshop-level service set for fault finding, planned maintenance, adjustment, and repair on the truck and its engine material. That gives a technician the reference needed to work through repairs and document the job properly.

With this set, your shop can diagnose and repair the covered Cat diesel trucks with service procedures, system information, and engine support in one working reference.

Models covered by this manual

Caterpillar publication 99799-63100 is the factory service manual for the DP120N, serial range T37A-10011-up. The same publication covers 4 further forklift models: DP100N, DP135N, DP150N, DP160N. Check the model and serial number on your data plate before ordering.

Table of Contents:

• 99799-63100 – Chassis, Mast & Options Service Manual
  • Foreword
  • General Information
  • Cooling System
  • Electrical System
  • Controller
  • Tiltable System
  • Power Train
  • Speed Powershift Transmission
  • Front Axle And Reduction Differential
  • Rear Axle
  • Brake System
  • Steering System
  • Hydraulic System
  • Mast And Forks
  • Fork Positioner
  • Service Data

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