Product Description
Load Wheel Assembly
Specifications: 4.000 inch diameter x 2.875 inch width (4.000" x 2.875" | 4 x 2.88 wheel | 4 x 2-7/8 | 101.60mm x 73.02mm)
Specifications
Wheel Dimensions
| Material | Cushothane XL |
| Outside Diameter | 4 |
| Inside Diameter | 1.875 |
| Width Side to Side | 2.875 |
| Tread Profile | Angle |
| Bore Depth | 0.75 |
| Hub Width | 2.875 |
| Bore Outside Diameter | 2.4404 |
Frequently Asked Questions
Q: What does the -A suffix mean on the SU S542-A and how is it different from SU S542?
A: The -A suffix indicates a complete load wheel assembly. The SU S542-A comes with the wheel, pre-pressed bearing, and hub pre-assembled and ready to install. The base SU S542 is the wheel component only. The -A assembly saves installation time and ensures bearing preload is factory-calibrated.
Q: Can the SU S542-A assembly be disassembled for bearing replacement?
A: No. The SU S542-A is a sealed assembly and the bearing cannot be accessed without destroying the assembly. Once the bearing fails, the entire assembly must be replaced. If you need a serviceable bearing design, request the SU S542 wheel component only and press a field-serviceable bearing separately.
Q: Is the SU S542-A a direct bolt-on for my truck, or does it require any modifications?
A: The SU S542-A is press-fit only, not bolt-on. The axle must be removed from the truck to press the assembly off and on. Do not attempt to slide it on without an arbor press as you will damage the bearing seal and internal races. Total installation time is 30 to 45 minutes per axle including removal and reinstall.
Q: What torque or pressure setting is required to press the SU S542-A?
A: Use an arbor press with 2 to 5 tons of force applied slowly and evenly. Do not use impact force. Press against the inner hub face only, not the outer rim or tread. If the assembly requires more than 5 tons to seat, stop and inspect the bore and axle for damage or misalignment.
Q: How long is the typical service life of the SU S542-A assembly?
A: The SU S542-A typically lasts 18 to 36 months in heavy-use electric truck applications with proper floor maintenance. Rough or uneven floors reduce life to 12 to 18 months. Inspect the tread and bearing function monthly. Signs of wear include flat spots on the tread and increased vibration or noise during operation.
Q: What metric and imperial dimensions apply to the SU S542-A?
A: The SU S542-A has a nominal diameter of 4.000 inches (101.60 millimeters) and width of 2.875 inches (73.02 millimeters). The bore is 1.875 inches (47.625 millimeters). Always verify bore depth (0.75 inches) and outer bore diameter (2.4404 inches) before purchasing to ensure correct axle fit.