Product Description
The SU S645-A Load Wheel Assembly, manufactured by Liftsplus.com for electric lift trucks, features a 5 inch diameter poly tread, 3-5/8 inch width, high-strength steel core, 0.75 inch bore, and dual precision ball bearings. Rated for 3000 lbs at a 24 inch load center, fitted for axle mounting, and constructed to withstand high cycle operations. Cross-reference part numbers are not published for this SKU.
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
| Wheel Core Material | High-strength steel core |
| Finish/Coating | Powder coat finish |
Part Numbers & Compatibility
| OEM Part Number | SU S645-A |
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 SU S645-A assembly include and what is the load rating?
A: The SU S645-A is a complete load wheel assembly that includes the 4 inch diameter x 3.625 inch width polyurethane wheel on a high-strength steel core, fitted with dual precision ball bearings. It is rated for 3000 lbs at a 24 inch load center and designed to withstand high cycle operations typical of electric pallet jacks and forklifts in continuous duty warehouses.
Q: Is the SU S645-A plug-and-play or does it require modification during installation?
A: The SU S645-A is designed as a plug-and-play replacement for compatible electric lift trucks. Simply remove the old wheel assembly and slide the new assembly onto the equipment axle, ensuring the bore seats fully. Reinstall retaining hardware such as cotter pins or clips. No modification to the axle or equipment frame is required if the original assembly and new assembly share the same bore diameter and width specifications.
Q: How do the dual precision ball bearings in the SU S645-A improve performance compared to the wheel-only SU S645?
A: The dual precision ball bearings in the SU S645-A provide lower rolling resistance, reduced heat generation, and smoother operation under continuous load. These bearings are pre-packed with grease and sealed to minimize maintenance. The S645-A is better suited for high-speed or high-cycle applications where bearing quality directly impacts equipment efficiency and wheel lifespan. The wheel-only S645 relies on bearings already installed in your equipment.
Q: What symptoms indicate that the SU S645-A assembly bearings are failing?
A: Listen for noise such as grinding, squealing, or clicking sounds coming from the wheel assembly during operation. Feel for unusual resistance or wobbling when you rotate the wheel by hand with the equipment stationary. If the wheel does not spin freely or if the equipment pulls to one side, the bearings may be damaged or the bore may be bent. Replace the assembly if bearing noise develops or if the wheel movement becomes restricted.
Q: What is the maintenance schedule for the SU S645-A and can the bearings be repacked?
A: The dual precision ball bearings in the SU S645-A are sealed and not field-serviceable. Do not attempt to disassemble, repack, or regrease the bearings. Instead, replace the entire assembly when bearing noise or failure occurs. Visually inspect the wheel tread and bore regularly for cracks, flat spots, or corrosion. Clean debris from the wheel and axle area to prevent contamination. Under normal warehouse use, the assembly should provide years of reliable service before bearing replacement is necessary.
Q: Is the SU S645-A compatible with both electric pallet jacks and electric forklifts?
A: The SU S645-A is listed as a replacement for both electric pallet jacks and electric forklifts, but you must verify that your specific equipment model matches. Bore diameter, width, and axle length must align with the original assembly. Check your equipment manual or the OEM parts diagram before ordering. If you are unsure about compatibility, provide the equipment model and serial number to confirm fitment.