Caterpillar NR20NH Reach Truck Service and Schematic Manual (WHSM0013)

A Cat NR20NH reach truck works in narrow warehouse aisles, reaching into racking and positioning pallets where a counterbalanced truck can't. This is the workshop manual for the S11 reach-truck identification shown with the manual, titled for the NR20NH. I've used books like this when a weekend repair window is short and the plant team needs to trace a fault, make a safe adjustment, or return the truck to service.

What this manual helps you do

• Trace wiring, controller circuits, sensors, and alarm-code causes.
• Check the reach carriage, pantograph, mast staging, and hydraulic operation.
• Diagnose traction and hoist motor faults, including Zapi controller systems.
• Adjust electric system settings, truck parameters, and mechanical components.
• Follow service procedures for battery systems, drive units, hydraulics, and safety-related repairs.

Who this is for

This suits a warehouse maintenance technician, plant maintenance lead, dealer technician, independent forklift shop, or rental fleet mechanic working on an NR20NH/S11 truck. It is a service and schematic manual for repair trade work; the operator handbook and companion chassis manual are also available for their respective jobs.

FAQ

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

A: You receive 23 PDF files split by section, totaling 209 pages. The set has a real text layer, so you can search and copy text, then print or zoom the relevant section at the bench.

Q: Does it fit my truck variant?

A: Yes, when the truck identification is S11 and the model is NR20NH. Check the truck data plate against those identifiers before starting work.

Q: Is this the right document for in-house repairs?

A: Yes. It gives a technician-oriented reference for schematics, diagnostics, adjustments, service data, and repair work on the electric reach truck.

For an S11/NR20NH truck, this is the manual to use when diagnosing faults and carrying out workshop repairs safely.

Models covered by this manual

Caterpillar publication WHSM0013 is the factory service and schematic manual for the NR20NH. The same publication covers 9 further reach truck models: NR14N, NR14NH, NR16N, NR16NC, NR16NH, NR16NHC, NR16NHS, NR16NS, NR25NH. The cover also lists S11. Check the model and serial number on your data plate before ordering.

Table of Contents:

• WHSM0013 – Controller Schematic
  • Introduction
  • Operating the Truck
  • Regular Maintenance
  • Electrical Operation
  • Hyfraulic Operation
  • Mechanical Maintenance

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