Product Description
The SU S528-XL-A Load Wheel Assembly from Liftsplus.com is a polyurethane-treaded wheel designed for electric lift truck applications. Dimensions include a nominal wheel diameter of 3.25 inches and tread width of 6.38 inches, with a Shore A 93A hardness rating for heavy-duty warehouse environments. Manufacturer part number SU S528-XL-A confirmed. Equivalent part number SU S528-XL. No additional cross-reference or supersession numbers available.
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 Material | Polyurethane compound |
Part Numbers
| Manufacturer Part Number | SU S528-XL-A |
| Equivalent Part Numbers | 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: Is the SU S528-XL-A assembly equivalent to the SU S528-XL wheel?
A: Yes. Manufacturer documentation confirms the SU S528-XL-A equivalent part number is SU S528-XL. Both products share identical Cushothane XL material, 3.25 inch diameter, 6.375 inch width, Shore D 65 hardness, 1.938 inch bore, and 2.0467 inch bore outside diameter. The SU S528-XL-A includes a pre-installed hub; the SU S528-XL is the wheel only. Order the SU S528-XL-A for ready-to-install assembly or the SU S528-XL if you require a wheel-only replacement.
Q: Does the SU S528-XL-A assembly come with bearing preload or lubrication?
A: The SU S528-XL-A is a load wheel assembly consisting of the polyurethane tread molded to a steel hub. It does not include internal bearings or pre-installed lubrication. Bearings and grease are mounted separately on the truck frame axle shaft. Do not disassemble the assembly. If bearing replacement is required, remove the assembly from the truck and service the frame axle and bearing separately.
Q: What installation steps are required for the SU S528-XL-A?
A: Lift the truck using proper safety equipment. Remove existing wheel bolts using the appropriate wrench or socket. Slide the SU S528-XL-A assembly onto the truck axle hub, aligning bolt holes. Reinstall and hand-tighten all bolts. Using a torque wrench, tighten bolts to the specification listed in your truck manual, typically 45 to 65 foot-pounds. Never use an impact wrench; this can strip threads. Spin the wheel by hand to confirm free rotation and proper alignment.
Q: What symptoms indicate the SU S528-XL-A assembly is failing?
A: Common failure indicators include visible cracks or chunks missing from the Cushothane XL tread, side-to-side wobbling during operation or when spun by hand, tread separation from the hub, grinding or squeaking noises, and uneven wear patterns. If any of these symptoms occur, remove the truck from service immediately. Identify whether the issue is hub damage or tread wear. Hub damage requires assembly replacement; tread wear also requires complete assembly replacement.
Q: Is the SU S528-XL-A rated for chemical exposure in warehouse environments?
A: Cushothane XL offers improved chemical resistance compared to standard polyurethane, but it is not resistant to all solvents or aggressive chemicals. The material tolerates mild oils, hydraulic fluid spray, and light detergent exposure. Do not expose the assembly to strong solvents, acids, or chlorinated compounds; these degrade the tread and cause early failure. If your warehouse uses chemical storage or handling, wipe spills from wheels promptly to extend lifespan.
Q: Can the SU S528-XL-A be repaired if the tread is damaged?
A: No. The SU S528-XL-A is a sealed molded assembly. The tread cannot be patched, reworked, or retreaded. Small cracks under 0.125 inches may not immediately affect operation, but they will propagate and lead to complete tread failure. Large cracks, chunks missing, or tread separation require immediate replacement. Order a new SU S528-XL-A assembly; do not attempt to repair the existing unit.