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: What does the -A designation mean on SU 528-A?
A: The -A suffix indicates this is a complete assembly. SU 528-A includes the load wheel, press-fit sealed ball bearings, and mounting hardware ready to install. You do not need to source or install the bearing separately. This is ideal for technicians who want a plug-and-play replacement.
Q: Is SU 528-A compatible with SU 528 applications?
A: Yes. Both have identical 3.25 inch diameter and 6.375 inch width specifications. The -A version simply arrives pre-assembled with bearings. Both fit the same electric lift truck axles and mounting points. If your truck currently uses SU 528 wheels, SU 528-A is a direct replacement.
Q: How is SU 528-A different from SU 528-EZ-A?
A: SU 528-A and SU 528-EZ-A are both assemblies with the same 3.25 x 6.375 inch dimensions. The main difference is in the hub construction and finish. SU 528-EZ variants may have simplified installation features or different bearing retention methods. Verify the exact part number on your truck documentation. Both are interchangeable if dimensions match.
Q: What torque should I use when installing SU 528-A on the axle?
A: The SU 528-A is a press-fit assembly; do not use bolts or torque specifications. Press the wheel straight onto the axle spindle until the bearing seats fully. Do not attempt to tap the wheel on by hand. Use a bearing press tool or hydraulic press. If you hear a cracking sound during installation, stop immediately as this indicates a misaligned bore or worn axle.
Q: Can I replace just the tread on SU 528-A or do I need a new assembly?
A: When the Cushothane XL tread wears out on SU 528-A, replace the entire assembly. The tread is bonded to the steel hub and cannot be removed or replaced separately without specialized equipment. Attempting to grind off and reglue a tread will compromise wheel balance and safety. Order a new SU 528-A assembly.
Q: Does SU 528-A include sealed or open bearings?
A: SU 528-A includes press-fit sealed ball bearings. The seals are pre-installed and require no additional lubrication during installation. These bearings are designed to run sealed for the life of the wheel and do not need periodic re-greasing. If the bearing becomes noisy or stiff, the assembly should be replaced.