Product Description
The SU S645 Load Wheel by Liftsplus.com is a solid polyurethane over steel core load wheel specified for electric lift truck applications. Designed for continuous indoor material handling, it delivers optimal performance and longevity on smooth warehouse flooring. Supplied as OEM replacement for select electric pallet jacks and electric forklifts. No cross-reference or alternate part numbers are available.
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
Material & Construction
| Core Material | Machined steel |
Part Numbers
| Manufacturer Part Number | SU S645 |
| OEM Part Number | SU S645 |
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 is the load rating and application for the SU S645 load wheel?
A: The SU S645 is a solid polyurethane over machined steel core wheel rated for electric lift truck applications, specifically indoor material handling on smooth warehouse flooring. It is supplied as an OEM replacement for select electric pallet jacks and electric forklifts. The 4 inch diameter x 3.625 inch width construction with Cushothane XL material provides optimal performance and longevity for continuous duty.
Q: What are the bore specifications and fitment requirements for the SU S645?
A: The SU S645 has a 1.875 inch inside diameter with a bore depth of 0.623 inch and bore outside diameter of 2.0467 inch. Verify your axle size matches the 1.875 inch bore before installation. The wheel is designed for direct axle mounting on electric pallet jacks and electric forklifts with compatible axle configurations. Cross-reference or alternate part numbers are not available for this SKU.
Q: How does the SU S645 differ from the SU S645-A assembly?
A: The SU S645 is the wheel only, while the SU S645-A is a complete load wheel assembly that includes precision ball bearings pre-installed on the wheel. The assembly version is rated for 3000 lbs at a 24 inch load center and is suited for high cycle operations where bearing quality and load distribution matter. Choose the wheel-only S645 if you are replacing just the tread or if your existing bearings are still serviceable.
Q: What maintenance steps should be taken to extend the life of the SU S645 wheel?
A: Inspect the wheel regularly for cracks, flat spots, or uneven wear caused by misalignment or overload. Clean debris from the polyurethane tread and verify that the axle bore is not damaged or corroded. Do not operate on rough outdoor surfaces as the Cushothane XL tread is optimized for smooth indoor flooring. Replace the wheel if you observe excessive material degradation or if it no longer seats properly on the axle.
Q: Can the SU S645 be used as an interchangeable replacement for other lift truck wheel models?
A: The SU S645 is an OEM-specific replacement and cross-references are not published. Verify the exact equipment model, serial range, and original part number before ordering to ensure compatibility. Using an incorrect wheel size or bore diameter can cause improper tracking, accelerated wear, and equipment damage. When in doubt, confirm fitment with your equipment manual or contact the manufacturer.
Q: What is the installation procedure for replacing the SU S645 wheel?
A: Lower the lift truck completely and secure it to prevent movement. Remove the axle cotter pin or retaining clip and slide the old wheel off the axle. Inspect the axle for damage or corrosion and clean if necessary. Slide the SU S645 wheel onto the axle, ensuring the bore seats fully. Reinstall the cotter pin or retaining clip and verify the wheel rotates freely without binding. Perform a test run at low speed before resuming normal operations.