Clark PWD, HWD 30-40SE Service Manual (SM643)

These Clark PWD/HWD 30–40SE electrics are usually moving pallets and stacked loads in warehouses, loading docks, and tight indoor aisles. This service manual is what I’d keep on the bench when I’m tracing electrical issues, pulling a drive unit apart, or checking the battery system after a long shift. For example, if the truck won’t travel but still lifts, I’d use this book to follow the wiring, test the line contactor, and verify the drive motor circuit step by step before I condemn any parts.

Applications & Use Cases

• Track down no-move or intermittent travel faults by following the wiring and motor checks in a logical order.
• Inspect and service the battery system so you don’t misdiagnose a low-voltage issue as a controller or motor failure.
• Disassemble and reassemble the drive unit with a clear sequence, helping you avoid missed seals, shims, or bearings.
• Test and verify line contactor operation before replacing it, using simple meter checks and visual inspections.
• Plan periodic service so you catch wear or loose connections before they turn into breakdown calls.

FAQ

Q: Can I use this manual on a tablet in the shop?

A: Yes, it’s practical to keep it open on a tablet so you can zoom in on diagrams while you’re at the truck.

Q: Is it worth printing pages from this manual?

A: I’d print the diagrams and key procedures I use most, then keep those in plastic sleeves near the work area.

Safety Note

Always disconnect and secure the battery before working on any electrical, motor, or drive components.

Clark PWD, HWD 30-40SE Index:

PERIODIC SERVICE
Group 12 Battery
Group 14 Wiring Diagram
Group 16 Electric Motor Service
Group 17 Line Contactor
GROUP 19
Group 20 Drive Unit
Group 23 Drive Motor Brakes
Group 23 Coast Control
Group 25 Caster Assembly
Group 28 HYDRAULIC SYSTEM
Group 34 Lift Cylinder
Group 35 Lift Linkage and Load Wheels
Group 39 Sheet Metal
Group 40 Truck Specifications

Clark