SU 9138

Frequently Asked Questions

Q: What is the SU 9138 load wheel and what are its key specifications?
A: The SU 9138 Load Wheel is an electric lift truck replacement wheel manufactured from high-resistance polyurethane (Shore A 95A). Diameter: 3.00 inches. Tread Width: 3.66 inches. Bore Bearing: 0.78 inches. This wheel is engineered for reduced static pulling force and optimized durability in warehouse and material handling environments. It features an integrated bearing seat for secure axle mounting.

Q: How does Shore A 95A polyurethane affect wheel performance and durability?
A: Shore A 95A is a moderate-hardness polyurethane formulation that balances load capacity with rolling efficiency. This hardness resists static pulling force, meaning the truck requires less motor effort during steering and acceleration. A harder compound such as Shore A 98A provides greater cutting and puncture resistance. A softer compound such as Shore A 85A absorbs shock better but wears faster. Shore A 95A is optimized for mixed warehouse floors and general material handling cycles.

Q: What electric pallet jack models are compatible with the SU 9138?
A: The SU 9138 is designed for electric pallet jack models requiring a 3.00-inch diameter and 3.66-inch tread width with a 0.78-inch bore bearing. No cross-reference or supersession part numbers are documented in available sources. Consult your truck manual or contact the OEM to confirm fitment for your specific model and serial range. Using an incorrect wheel size or bore diameter will cause fitment issues or premature bearing wear.

Q: What does the integrated bearing seat mean and how does it affect installation?
A: The integrated bearing seat is a machined pocket molded into the wheel hub to hold and align the wheel bearing. This design centers the bearing on the axle journal, preventing wobbling and uneven wear. When installing the SU 9138, ensure the bearing is seated fully in the hub pocket before mounting to the axle. If the bearing does not seat flush, do not force it; inspect the bearing and hub for debris or damage.

Q: How do I diagnose if the SU 9138 load wheel needs replacement?
A: Spin the wheel by hand; it should rotate smoothly with minimal drag. Signs of failure include flat spots, uneven wear patterns, visible cracks, chunks of polyurethane missing, or tread separation from the hub. If the truck pulls to one side or the steering feels stiff, remove and inspect the wheel and bearing. If the bearing is dry or pitted, replace the bearing before installing a new wheel. Replace the wheel if polyurethane is permanently deformed or shows material loss.

Q: What is the maintenance schedule for the SU 9138 wheel?
A: Inspect the wheel weekly for visible damage, debris buildup, and smooth rotation. Clean the wheel and bearing area monthly to prevent dirt and oil accumulation. Check the bearing for play or noise quarterly by hand-spinning the wheel. Measure tread wear every six months; if wear is uneven or exceeds 20 percent of original tread depth, rotate wheels or plan replacement. Expected service life is 12 to 18 months in moderate-cycle environments.