Caterpillar DP55N Forklift Service, Operator and Schematic Manual (99739-6E110)

This Cat DP55N is a diesel counterbalanced truck used to move pallets across warehouse floors, loading areas, and yard work zones. When a second-shift breakdown pulls a truck from the aisle, maintenance techs use this manual to trace the fault, set adjustments, and return the truck to service. It suits in-house plant maintenance, dealer technicians, and independent forklift repair shops.

What this manual helps you do

• Trace wiring, switches, sensors, and schematic circuits during electrical faults.
• Check and adjust the brake, steering, hydraulic, mast, and powershift systems.
• Follow removal and installation procedures for drive, axle, transmission, and hydraulic components.
• Diagnose engine and truck operating faults using service data and troubleshooting guidance.
• Rebuild or replace serviceable assemblies, then verify operation before returning the truck to work.

Who this is for

This suits a warehouse maintenance tech, plant mechanic, rental fleet mechanic, dealer technician, or independent forklift shop working on Cat diesel trucks. It is written for the repair trade, with the operator handbook and companion chassis references also available for day-to-day operation and related service work.

FAQ

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

A: You receive 10 separate PDF publications, delivered as 102 PDF files split by section, with 2,975 pages total. The files support printing, on-screen zoom, text search, and text copying.

Q: Which trucks and serials does it cover?

A: It covers DP40N, DP45N, DP50CN, DP50N, DP55N, GP40N, GP45N, GP50CN, GP50N, GP55N, and TB45. The DP55N coverage is CT28D-80001-up.

Q: How does it fit the repair job?

A: Use it for workshop diagnosis, electrical troubleshooting, hydraulic and mast work, power train repairs, and engine-related service. The bundled publications give you the service and schematic material together for shop work.

For a covered truck, this set gives your team the workshop reference needed to diagnose faults, complete repairs, and get it back before the next wave.

Models covered by this manual

Caterpillar publication 99739-6E110 is the factory service, operator and schematic manual for the DP55N, serial range CT28D-80001-up. The same publication covers 2 further forklift models: DP50CN, DP50N. The cover also lists DP40N, DP45N, GP40N, GP45N, GP50CN, GP50N, GP55N, TB45. Check the model and serial number on your data plate before ordering.

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