Product Description
Load Wheel Assembly
Specifications: 3.250 inch diameter x 4.310 inch width (3.250" x 4.310" | 3.25 x 4.31 wheel | 3-1/4 x 4.31 | 82.55mm x 109.47mm)
Specifications
Wheel Dimensions
| Material | Cushothane XL |
| Outside Diameter | 3.25 |
| Inside Diameter | 1.875 |
| Width Side to Side | 4.31 |
| Bore Depth | 0.2 |
| Hub Width | 4.31 |
| Bore Outside Diameter | 2.07 |
Frequently Asked Questions
Q: What does the SU S446-A assembly include?
A: The SU S446-A is a complete load wheel assembly featuring the 3.250 inch diameter by 4.310 inch width Cushothane XL polyurethane wheel bonded to an aluminum hub with pre-installed and lubricated bearings. It arrives ready to bolt onto your truck spindle.
Q: What are the bearing options available for the SU S446-A assembly?
A: The SU S446-A typically offers sealed ball bearings or taper roller bearing options depending on truck design and load requirements. Sealed ball bearings are standard for light-duty applications, while taper roller bearings provide better load distribution for heavy-duty use. Confirm your requirement with your truck manual before ordering.
Q: How do I diagnose if the SU S446-A bearings are worn or failing?
A: Signs of bearing failure include a grinding or squealing noise when the wheel rotates, excessive side-to-side play at the wheel rim, heat buildup at the hub (test by touch after operation, not during operation), or visible seal damage leaking grease. Any of these symptoms means the assembly must be replaced or the bearings re-packed.
Q: What is the installation procedure for the SU S446-A assembly?
A: Position the truck on a level surface with wheels chocked. Jack up the truck safely and remove the old wheel assembly if present. Slide the SU S446-A onto the spindle and hand-thread the spindle fastener. Tighten to manufacturer torque specs (typically 40 to 60 foot-pounds). Spin the wheel by hand to confirm smooth rotation with no side-to-side movement. Lower the truck and test drive to verify proper function.
Q: How often should I lubricate or maintain the SU S446-A bearings?
A: Most modern assemblies use sealed bearings that require no regular re-lubrication. Inspect the hub seal quarterly for grease leakage or damage. If the seal is damaged or grease is leaking, the assembly should be serviced or replaced. In dusty environments, wipe the hub clean monthly to prevent contaminant accumulation.
Q: What is the expected lifespan of the SU S446-A in standard warehouse use?
A: The SU S446-A typically lasts 3 to 5 years in standard warehouse duty cycles. Actual lifespan depends on load weight, operating hours per day, floor surface condition (rough concrete shortens life), bearing maintenance, and whether wheels are regularly inspected. Replace when tread depth is below 3/8 inch or when bearings become loose or noisy.