Clark NP and NS300 Forklift Overhaul Manual (OH437)

These NP and NS300 electric forklifts usually live indoors in warehouses, loading docks, and tight storage aisles, where they spend all day shuttling pallets and materials. This overhaul manual is what I’d pull out when one of these trucks is down for a major tear-down—motors off, controls exposed, everything on the bench. It helps you strip, inspect, and rebuild components so you’re not guessing on clearances or assembly order. For example, if an NP won’t accelerate smoothly and you suspect a drive motor or control issue, this is the book you use to trace the problem, overhaul the motor, and verify it’s put back together correctly.

Applications & Use Cases

• Plan a full rebuild of the drive and steer motors, knowing what to inspect and replace before reassembly.
• Check commutators and brushes using the chart to decide if they can be dressed or must be renewed.
• Isolate acceleration faults by following the logic for the control linkage and electrical checks.
• Verify alignment and fit of rotating parts after machining or parts replacement.
• Document your work with notes and printouts for future troubleshooting on the same truck.

FAQ

Q: Can I keep this manual open on a tablet while working under the truck?

A: Yes, it’s practical to use on a tablet; just zoom in on diagrams and keep it in a clean, dry spot near the job.

Q: Is it worth printing sections of this manual?

A: Many techs print the pages they need for a specific overhaul so they can mark measurements and keep them at the bench.

Safety Note

Always disconnect and lock out all power sources before starting any overhaul work on these forklifts.

Clark NP and NS300 Forklift Index:

Accelerating Control (HMS)
Drive Motor Overhaul
Commutator Check Chart
Steer Pump Motor Overhaul
General Motor Maintenance
Pump Motor Overhaul
Forward–Reverse Contactors
LA and Pump Contactors
G.E. Electrical Contactors
Square D Electrical Panel
NS300 – Lots 3205–3496
NP300 – Lots 3205–3491

G.E. SCR Panel Overhaul
NS300 – Lot 3497 & above
NP300 – Lot 3492 & above

Drive Axle Overhaul
Drive Motor Brake Overhaul
NP300 – Lots 3205–3207
NS300 – Lots 3210–3211

Drive Motor Brake Overhaul
NP300 – Lot 3490 & above
NS300 – Lot 3495 & above

Power Steering Pump Overhaul
Steer Torque Generator Overhaul
Lift Pump Overhaul
Reach & Tilt Pump Overhaul
Hydraulic Valve Overhaul
Cessna Reach & Tilt Valve
Dual Tilt Cylinder Overhaul
Reach Cylinder Overhaul
NP300 – Lots 3205–3492

Reach Cylinder Overhaul
NP300 – Lot 3995 & above

Upright Lift Cylinder Overhaul
Lubrication Specifications

Clark