Product Description
SU S528-XL-A is a polyurethane load wheel assembly designed for electric lift trucks, featuring a wheel diameter of 3.25 inches, width of 6.375 inches, 20 mm sealed precision bearing, and ASTM A48 Class 30 cast iron hub.
Specifications: 3.250 inch diameter x 6.375 inch width (3.250" x 6.375" | 3.25 x 6.38 wheel | 3-1/4 x 6-3/8 | 82.55mm x 161.92mm)
Specifications
Material & Construction
| Tread Hardness | Polyurethane, Shore D 60-75 |
| Hub Material Specification | ASTM A48 Class 30 cast iron |
Part Numbers
| Manufacturer Part Number | SU S528-XL-A |
| SKU Supersedes | SU S528-XL |
Wheel Dimensions
| Material | Cushothane XL |
| Outside Diameter | 3.25 |
| Inside Diameter | 1.938 |
| Width Side to Side | 6.375 |
| Bore Depth | 0.812 |
| Hub Width | 6.375 |
| Bore Outside Diameter | 2.0467 |
Frequently Asked Questions
Q: What is the material and hardness of the SU S528 polyurethane load wheel?
A: The SU S528 features Cushothane XL polyurethane tread with a Shore D hardness rating of 60-75. The hub is ASTM A48 Class 30 cast iron. Cushothane XL is a premium formulation designed for extended wear and reduced deflection under heavy loads. This wheel is best suited for trucks operating on uneven concrete or outdoor surfaces where durability is critical.
Q: What are the exact dimensions and bore specification for the SU S528?
A: The SU S528 has an outside diameter of 3.25 inches, width of 6.375 inches, and a 1.938 inch inside bore diameter. The hub bore depth is 0.812 inches with a 20 mm sealed precision bearing. Metric conversion: 82.55 mm diameter x 161.92 mm width. Verify these dimensions match your truck hub profile before ordering. The larger width compared to smaller wheel sizes provides better load stability.
Q: Is the SU S528 a direct replacement for the SU S528-XL or SU S528-XL-A?
A: The SU S528-XL-A is the current superseded designation. The SU S528 (when specified with XL materials and full assembly) is functionally equivalent but verify the current manufacturer part number on your truck or invoice before purchase. Cross-reference with your dealer to confirm you are ordering the latest revision. Mixing old and new part numbers can delay delivery.
Q: What maintenance is required for the SU S528 sealed bearing, and how do I inspect it?
A: The bearing is factory sealed and does not require greasing. Inspect every 500 operating hours by spinning each wheel by hand and listening for roughness or grinding sounds. If you feel side-to-side play or the wheel does not spin freely, the bearing is worn and must be replaced. Do not attempt to repack a sealed bearing; replacement is the correct service action.
Q: What is the load rating and expected lifespan of the SU S528 wheel assembly?
A: The SU S528 typically rates 600-850 pounds per wheel depending on truck configuration and surface conditions. The Cushothane XL tread is designed for 3000-4000 operating hours before replacement is recommended. Lifespan decreases with overloading, rough floors, or excessive turning. Monitor tread wear monthly. When tread depth falls below 1/8 inch or when cracking appears, replace the wheel to maintain safe operation.