Caterpillar DP135NM1 Forklift Service and Operator Manual (99799-41110)

This Cat is a diesel counterbalanced lift truck used for pallet work, loading docks, and yard handling. When a second-shift breakdown pulls one out of the aisle, warehouse maintenance techs, dealer technicians, and fleet mechanics use this manual to diagnose the fault and return the truck to service. Yes, it fits the DP135NM1 truck when the serial number is within the range below.

What this manual helps you do

• Trace electrical faults through wiring diagrams and truck circuits.
• Check and adjust the brake, steering, hydraulic, mast, and fork systems.
• Follow service procedures for the power train, transmission, axles, and cooling system.
• Diagnose operating problems using workshop tests, troubleshooting guidance, and service data.
• Rebuild or replace truck assemblies while keeping removal and installation steps in one reference set.

Who this is for

This suits warehouse maintenance techs, plant maintenance teams, independent forklift shops, dealer technicians, and rental fleet mechanics working on Cat diesel trucks. It is the right trade manual for in-house repair, with the operator handbook and companion engine or chassis publications available where those tasks call for them.

FAQ

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

A: You receive 4 separate Cat publications delivered as 59 PDF files, split by section, with 1,774 pages total. The PDFs can be printed, zoomed on screen, searched, and copied from because the set has a real text layer.

Q: Which trucks and serials does it cover?

A: Coverage includes DP100NM1, DP100NM1S, DP120NM1, DP120NM1S, DP135NM1, DP135NM1S, DP150NM1, DP150NM1S, 6D16-TL, DP100NM1(S), and DP150NM1(S). The printed serial coverage for DP135NM1 is T15E-20011-39999.

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

A: This is a workshop-level service and operator set for fault-finding, adjustment, teardown, and repair. It gives your shop the reference needed to handle breakdowns, planned maintenance, and used-truck repairs.

For the listed models and serial range, this is the manual set to keep the truck moving from one shift to the next.

Models covered by this manual

Caterpillar publication 99799-41110 is the factory service and operator manual for the DP135NM1, serial range T15E-20011-39999. The same publication covers 5 further forklift models: DP100NM1, DP100NM1S, DP135NM1S, DP150NM1, DP150NM1S. The cover also lists DP120NM1, DP120NM1S, 6D16-TL. Check the model and serial number on your data plate before ordering.

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