Product Description
The SU S621-XL-A Load Wheel Assembly by Liftsplus.com is designed for electric lift trucks, featuring a durable polyurethane tread that enhances performance and longevity. This load wheel assembly is engineered to provide superior support and stability during operation.
Specifications: 3.250 inch diameter x 4.200 inch width (3.250" x 4.200" | 3.25 x 4.2 wheel | 3-1/4 x 4.2 | 82.55mm x 106.68mm) | Bearing ID: 25mm (0.984 inch bore | 25.000mm ID)
• High-capacity Cushothane® XL tread for enhanced durability
• Integrated aluminum HeatSink™ hub for rapid heat dissipation
• Shoulder bearings for smooth operation and reduced wear
This load wheel assembly is compatible with various electric lift truck models, ensuring efficient material handling in demanding environments.
Specifications
Material
| Tread Hardness | 97A Shore durometer |
Part Numbers
| Manufacturer Part Number | SU S621-XL-A |
| OEM Part Number | SU S621-XL-A |
Wheel Dimensions
| Material | Cushothane XL |
| Outside Diameter | 3.25 |
| Inside Diameter | 1.875 |
| Width Side to Side | 4.19 |
| Bore Depth | 1.18 |
| Hub Width | 4.19 |
| Bore Outside Diameter | 2.0467 |
Frequently Asked Questions
Q: What is the difference between SU S621-XL and SU S621-XL-A?
A: The SU S621-XL-A is a complete load wheel assembly with a 97A Shore durometer Cushothane XL polyurethane tread, while the standard SU S621-XL uses reinforced nylon. The -A variant offers higher tread hardness and polyurethane grip, providing better traction and slightly longer life on wet or oily floors. Both have identical bore dimensions (25mm ID, 3.25 inch OD).
Q: What does Cushothane XL tread provide and when should I use it?
A: Cushothane XL is a premium polyurethane compound rated at 97A Shore durometer hardness. It provides superior wear resistance, excellent traction in wet conditions, and a quieter ride than nylon. Use this assembly if your truck operates in warehouses with wet floors, chemical exposures, or high-duty cycles (8-10 hours daily). Cost is higher but lifespan is 30-40 percent longer than nylon wheels.
Q: Can I upgrade from a standard nylon wheel to the SU S621-XL-A?
A: Yes, if your truck has a 25mm bearing bore and 3.25 inch wheel mounting. The assembly dimensions are compatible with standard SU S621 frames. No modifications are needed. You can mix wheel types across your fleet as long as all wheels on one truck are the same diameter and width to prevent tilting or stability issues.
Q: How do I install or replace the SU S621-XL-A wheel assembly?
A: Lower the truck to the floor and lock the steering. Remove the cotter pin or snap ring from the wheel axle bolt. Slide the old wheel off the axle shaft. Align the new wheel hub bore with the axle and slide it on until seated. Reinstall and secure the axle bolt and cotter pin. Spin the wheel by hand to verify it rotates freely without binding. Torque specification depends on your truck model documentation.
Q: What is the lifespan and maintenance schedule for this wheel?
A: Cushothane XL wheels typically last 3-5 years in commercial environments. No lubrication or repacking is required. Inspect monthly for tread wear, flat spots, or bearing play. If the wheel becomes visibly flat or worn, replace it to prevent load shift and maintain stability. Do not attempt to recondition or turn down worn wheels as this compromises the bearing seal.
Q: Will the SU S621-XL-A wheel mark or damage sensitive floors?
A: Cushothane XL polyurethane may leave slight marks on very light-colored polished concrete or specialty coatings under heavy load. If your facility requires guaranteed non-marking wheels, verify with the manufacturer or stay with reinforced nylon. Test the wheel in a low-traffic area before full deployment in sensitive environments.