Caterpillar DP55NB Forklift Service and Operator Manual (99739-6B110)

This Cat DP55NB is a diesel counterbalanced forklift for moving pallets and materials across a plant floor or yard. In my experience, the service manual comes out when a maintenance tech has a short repair window and needs the truck back in service without guessing. It is aimed at in-house plant maintenance, dealer technicians, independent forklift shops, and rental fleet mechanics.

What this manual helps you do

• Trace electrical circuits, wiring, switches, and starting or charging faults.
• Check and adjust the brake, steering, hydraulic, mast, and fork systems.
• Follow service procedures for the power train, transmission, axles, and drive unit.
• Diagnose operating faults using service data and troubleshooting guidance.
• Rebuild or replace truck assemblies, then verify adjustments before returning the truck to work.

Who this is for

This suits a warehouse maintenance tech, plant maintenance lead, dealer technician, independent forklift repair shop, or rental fleet mechanic doing workshop repairs. The trade is forklift service and repair. Related chassis, engine, and operator companion volumes are included or available within the Cat documentation set.

FAQ

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

A: You receive 8 Cat publications delivered as 53 PDF files, split by section, with 2,091 pages total. The PDFs have a real text layer, so you can search and copy text, then print or view the material at working zoom.

Q: Does it fit my DP55NB?

A: Yes, if your truck is DP55NB with serial CT28E-80001-99999. The cover also lists GP40N, DP40NB, GP45N, DP45NB, GP50CN, DP50CNB, GP50N, DP50NB, GP55N, and TB45.

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

A: Yes. It is workshop-level service material for fault finding, adjustment, teardown, reassembly, and service checks, with the engine and truck systems documented across the included set.

For a DP55NB in that serial range, this is the manual set to use for in-house repair and planned maintenance.

Models covered by this manual

Caterpillar publication 99739-6B110 is the factory service and operator manual for the DP55NB, serial range CT28E-80001-99999. The same publication covers 8 further forklift models: DP45NB, DP50CNB, DP50NB, GP40N, GP45N, GP50CN, GP50N, GP55N. The cover also lists DP40NB, TB45. Check the model and serial number on your data plate before ordering.

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