Product Description
Poly Load Wheel - Tandem
Specifications: 4.000 inch diameter x 3.625 inch width (4.000" x 3.625" | 4 x 3.63 wheel | 4 x 3-5/8 | 101.60mm x 92.07mm)
Specifications
Wheel Dimensions
| Material | Cushothane XL |
| Outside Diameter | 4 |
| Inside Diameter | 1.875 |
| Width Side to Side | 3.625 |
| Tread Profile | Angle |
| Bore Depth | 0.623 |
| Hub Width | 3.625 |
| Bore Outside Diameter | 2.0467 |
Frequently Asked Questions
Q: What does the XL and Tandem designation indicate for the SU S645-XL?
A: The XL designation and Tandem label on the SU S645-XL indicate this wheel is designed for tandem or dual-wheel configurations on electric lift trucks. Tandem setups distribute the load across multiple wheels to improve stability and reduce per-wheel stress. Verify that your equipment is configured for tandem wheels before ordering the SU S645-XL, as this variant may not be compatible with single-wheel installations.
Q: Are the physical dimensions of the SU S645-XL the same as the standard SU S645?
A: Yes, the SU S645-XL maintains the same dimensions: 4 inch diameter x 3.625 inch width, with a 1.875 inch bore, 0.623 inch bore depth, and 2.0467 inch bore outside diameter. The difference is application: the XL is specified for tandem wheel setups. Physical fitment will match the standard S645 if the axle and mounting system are identical, but always confirm your equipment configuration before purchasing.
Q: Can I use the SU S645-XL as a direct replacement for the SU S645 on my lift truck?
A: Only if your equipment is configured for tandem wheels. The SU S645-XL is optimized for dual-wheel installations, and using it on a single-wheel setup may cause improper tracking or performance issues. Conversely, do not use the standard SU S645 to replace a wheel on a tandem-configured truck, as load distribution and equipment balance will be affected. Verify your equipment wheel configuration in the manual before selecting the correct variant.
Q: What should I check when installing the SU S645-XL in a tandem wheel configuration?
A: Ensure both wheels in the tandem set are the same size and condition to maintain even load distribution. Verify that both wheels seat fully on their respective axles and that retaining pins or clips are secure on both sides. Inspect axle alignment by rolling the equipment forward slowly and observing whether the truck pulls to one side. If pulling or tracking issues occur, check that both wheels have the same bore diameter and that both axles are straight and undamaged.
Q: How does tandem wheel configuration affect load handling and wheel lifespan compared to single wheels?
A: Tandem wheel configurations split the load across two wheels, reducing stress on each individual wheel and extending tread life. This setup improves stability and control on uneven flooring and allows equipment to carry heavier loads safely. The SU S645-XL, when used in proper tandem configuration, will typically outlast a single-wheel setup handling the same total load. Always respect the equipment manufacturer load rating and axle weight limits.
Q: What material is used in the SU S645-XL and why is it chosen for tandem applications?
A: The SU S645-XL uses Cushothane XL polyurethane over a steel core. This material provides consistent grip on smooth warehouse floors, absorbs minor vibrations during tandem operation, and resists wear from continuous duty. The steel core ensures stability under load. Cushothane XL is chosen for tandem wheels because the load sharing benefits from the durability and consistent performance this material offers across multiple wheels over an extended service life.