Product Description
SU S641-XL polyurethane load wheel for electric lift trucks, 4 inch diameter by 2.875 inch width, 97A durometer hardness, aftermarket replacement component
Specifications
Material
| Tread Material | Polyurethane compound |
| Durometer Hardness | 97 Shore A scale |
Part Numbers
| Primary Part Number | SU S641-XL |
| Assembly Variant | SU S641-XL-A (assembled configuration) |
Frequently Asked Questions
Q: What is the durometer hardness of the SU S641 XL?
A: The SU S641 XL polyurethane tread is 97A Shore A durometer hardness. This specification provides balanced traction and wear resistance for typical warehouse floors. Softer durometers wear faster but grip better on smooth surfaces. Harder durometers last longer on rough floors.
Q: Can the SU S641 XL be used on the steering wheel?
A: The SU S641 XL is designed as a load wheel, not a steering wheel. Steering wheels have different bearing types and lower load ratings. Do not substitute load wheels for steering wheels. Consult your equipment manual to identify steering versus load wheel positions.
Q: What maintenance helps extend SU S641 XL life?
A: Keep wheels clean to prevent debris buildup that causes flat spots. Inspect bearing play monthly by lifting the truck and spinning each wheel. Lubricate bearings per your equipment manual if grease fittings exist. Replace all wheels as a set to avoid load imbalance and uneven wear.
Q: How do I test if the SU S641 XL bearing is worn?
A: Lift the truck and rotate each wheel by hand. Worn bearings have lateral side-to-side play, make grinding sounds, or rotate with resistance. Measure radial runout with a dial indicator if available. More than 0.050 inch runout indicates the bearing must be replaced before the wheel fails.
Q: What floor conditions damage the SU S641 XL fastest?
A: Rough concrete, metal shavings from machine shops, aggregate on warehouse floors, and exposed rebar accelerate polyurethane wear. Sweeping daily and using rubber mats extends wheel life significantly. Metal particles embedded in floors cut and gouge the tread in a few hours.