Product Description
Load Wheel Assembly
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
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: Is the SU S528-A compatible with other SU S528 series wheels?
A: The SU S528-A is a load wheel assembly that shares the same 3.25 inch diameter and 6.375 inch width as the SU S528-EZ-A and SU S528-XL-A. All three use Cushothane XL material and identical bore specifications (1.938 inch inside diameter, 2.0467 inch bore outside diameter). They are drop-in replacements for each other on electric lift trucks, provided the truck frame accepts the assembly format rather than wheel-only configuration.
Q: What are the critical dimensions for installing the SU S528-A?
A: Outside diameter is 3.25 inches (82.55mm), width side to side is 6.375 inches (161.92mm), inside diameter is 1.938 inches, bore depth is 0.812 inches, and bore outside diameter is 2.0467 inches. Verify your truck hub matches the bore dimensions before purchase. The 0.812 inch bore depth is critical for preventing wheel wobble or pop-off during operation.
Q: How do I diagnose if the SU S528-A load wheel assembly needs replacement?
A: Common failure symptoms include visible cracks or chunks missing from the Cushothane XL tread, side-to-side wheel movement despite proper installation, uneven wear patterns, or a grinding noise during truck operation. Spin the wheel by hand with the truck lifted. It should rotate freely without wobbling. If wobble is present or rotation is slow, remove the assembly and inspect the bore and hub surfaces for damage.
Q: Does the SU S528-A assembly include a bearing or is it a wheel-only product?
A: The SU S528-A is a load wheel assembly, meaning it includes the polyurethane wheel molded onto a hub. It does not include internal bearings. Bearings are typically mounted on the truck frame axle shaft. Do not disassemble the SU S528-A; if the wheel tread is worn, replace the entire assembly.
Q: What maintenance schedule should I follow for the SU S528-A?
A: Inspect the load wheel assembly every 40 hours of operation or weekly, whichever comes first. Check for tread wear, cracks, and excessive hub scoring. Clean debris from the tire every 80 hours. Rotate wheels between front and rear positions if uneven wear is observed. Cushothane XL typically provides 12 to 24 months of service in moderate warehouse use before tread degradation requires replacement.
Q: What is the maximum load capacity for the SU S528-A?
A: The SU S528-A is rated for electric lift truck load wheels and handles the distributed weight of the truck plus lifted load. Do not use this wheel on non-load-wheel positions or on equipment with different load requirements. Refer to your truck manual for total load capacity. Exceeding truck specifications will accelerate wheel wear and cause permanent deformation of the Cushothane XL tread.