Caterpillar DP45NM1 Forklift Service and Schematic Manual (99739-8B120)

Yes, this is the right service set for a Cat DP45NM1 with serial AT19D-52011-up. On the shop floor, it is used to keep a diesel counterbalanced truck working, from wiring faults and hydraulic problems to drive, brake, steering, mast, and engine repairs. I reach for this kind of manual when a used truck arrives without paperwork or a technician needs factory procedures instead of guesswork.

What this manual helps you do

• Trace electrical circuits, connector paths, and starting or charging faults.
• Diagnose hydraulic, transmission, brake, steering, and drive-unit problems.
• Follow adjustment, removal, inspection, and reassembly procedures.
• Rebuild or service the mast, forks, axles, cooling system, and engine assemblies.
• Check service data while troubleshooting the GP40N1, DP40NM1, GP45N1, DP45NM1, GP50CN1, DP50CNM1, GP50N1, DP50NM1, GP55N1, DP55NM1, and TB45 models.

Who this is for

This suits an independent forklift shop, dealer technician, warehouse maintenance tech, plant mechanic, or rental fleet mechanic doing workshop-level repairs. The operator handbook and parts catalog are companion volumes also available, while this set is the repair trade's working reference.

FAQ

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

A: You receive 15 PDF files containing three Cat publications, split by section, with 657 pages total. The PDFs have a real text layer, so you can search and copy text, then print or zoom the pages as needed.

Q: Does it cover my truck variant?

A: It specifically covers DP45NM1, including serial AT19D-52011-up, along with the related models printed on the manual cover. That gives you the correct model family and serial fit.

Q: How does it fit the repair job?

A: It is the workshop service and schematic reference for troubleshooting, adjustments, teardown, reassembly, and service data. The set also includes matching engine material and supplements, so the repair information stays together.

For the listed DP45NM1 serial range, this is the manual set to put beside the toolbox when diagnosing and repairing the truck.

Models covered by this manual

Caterpillar publication 99739-8B120 is the factory service and schematic manual for the DP45NM1, serial range AT19D-52011-up. The same publication covers 7 further forklift models: DP50CNM1, DP50NM1, DP55NM1, GP45N1, GP50CN1, GP50N1, GP55N1. The cover also lists GP40N1, DP40NM1, TB45. Check the model and serial number on your data plate before ordering.

Table of Contents:

• 99739-8B120 – Chassis & Mast Service Manual
  • Foreword
  • Electrical System
  • Electrical Schematics
  • Powershift Transmission
  • Service Data

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