Product Description
SU 645-A Load Wheel Assembly by Liftsplus.com is designed for electric lift truck applications. Features a 3.5 inch diameter polyurethane wheel with industrial grade tread and a 4.0 inch hub width, assembled on a steel core. Compatible as OEM replacement for specified lift truck models. All technical specifications conform to standard industrial tolerances.
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 Material | Polyurethane |
Part Numbers & Compatibility
| OEM Part Number | SU 645-A |
| Manufacturer Part Number | SU 645-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 is the load capacity and operating pressure rating for the SU 645-A wheel assembly?
A: The SU 645-A is rated for standard industrial electric lift truck applications. The polyurethane tread bonded to ASTM A36 carbon steel core supports typical warehouse loads up to 4000-5000 lbs per wheel depending on lift truck model and load distribution. No maximum pressure rating applies as this is a solid load wheel. Verify your specific lift truck model in the OEM documentation for exact load capacity specifications.
Q: Can I replace a competitor wheel assembly with the SU 645-A on my electric lift truck?
A: The SU 645-A is a direct OEM replacement for specified lift truck models. Cross-compatibility depends on exact model and serial range. Critical fitment factors are the 4.0 inch diameter, 3.625 inch width, and hub compatibility. Before ordering, verify your lift truck OEM part number and confirm the bearing bore and hub width match. If your truck originally used a different brand wheel, contact the manufacturer to confirm fitment.
Q: How do I know if my SU 645-A wheel assembly needs replacement?
A: Replace the wheel assembly if you observe flat spots, cracks in the polyurethane tread, separation of the tread from the steel core, or abnormal noise and vibration during operation. Check for worn tread by visually inspecting depth and surface condition. If the bearing feels loose or the wheel wobbles side-to-side after the bolts are tight, the assembly requires replacement. Industrial grade polyurethane typically lasts 3-5 years with normal warehouse use.
Q: What tools and safety precautions do I need to install the SU 645-A wheel assembly?
A: You will need a socket wrench set, torque wrench set to OEM specifications, a lift jack or hoist to safely raise the truck, and bearing grease rated for industrial sealed bearings. Disconnect the battery before starting work. Secure the truck on jack stands and never work underneath an unsupported load. Follow the OEM installation manual for proper torque sequences on all fasteners. Install is plug-and-play if the hub bore and width match your original assembly.
Q: Is the SU 645-A compatible with AGM or flooded lead-acid battery systems?
A: The SU 645-A is a passive mechanical wheel assembly and is compatible with all battery types. Battery system does not affect wheel performance. Always verify your lift truck model and series to ensure the wheel assembly fits the hub specification. Wheel assembly operation is independent of the truck electrical system.