Product Description
The SU 621-XL-A is a heavy-duty load wheel assembly engineered with abrasion-resistant polyurethane tread, steel core, and proprietary XL3 bonding technology. Designed for electric pallet truck and lift truck applications requiring the highest load capacity, wear resistance, and heat dissipation under severe duty cycles. Supplied as a pre-assembled, drop-in ready unit with options for dual or triple wheel configurations.
Specifications: 3.250 inch diameter x 4.190 inch width (3.250" x 4.190" | 3.25 x 4.19 wheel | 3-1/4 x 4.19 | 82.55mm x 106.43mm)
Specifications
Material
| Core Material | Steel hub |
Part Numbers
| SKU | SU 621-XL-A |
| Manufacturer Part Number | SU 621-XL-A |
| OEM Part Number | SU 621-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 load capacity of the SU 621-XL-A wheel assembly?
A: The SU 621-XL-A is designed for heavy-duty applications with a load capacity significantly higher than standard 3.25 inch wheels. The exact capacity depends on configuration (dual vs. triple wheel setup). For dual wheel configurations, capacity is approximately 1200 lbs per wheel under severe duty cycles. Verify the specific duty cycle rating with your equipment OEM documentation to ensure proper application.
Q: Can I upgrade from SU 626-XL to SU 621-XL-A on my electric lift truck?
A: Yes, SU 621-XL-A is a direct upgrade from SU 626-XL. Both wheels share the same 3.25 inch OD and 1.875 inch ID bore. The SU 621-XL-A is wider (4.19 inches vs 2.875 inches) and uses proprietary XL3 bonding technology with Cushothane XL material for enhanced heat dissipation and abrasion resistance. Confirm your truck frame accommodates the wider width before installation.
Q: Does the SU 621-XL-A wheel come pre-assembled or do I need to install bearings?
A: The SU 621-XL-A ships as a drop-in ready, pre-assembled wheel unit with the polyurethane tread molded to the steel hub. No bearing installation is required. Simply remove your old wheel assembly and bolt on the new one. The unit is supplied with dual or triple wheel configuration options depending on your order specification.
Q: What maintenance is required for the SU 621-XL-A over its service life?
A: The SU 621-XL-A requires minimal maintenance. Inspect the wheel tread quarterly for chunks, cracks, or unusual wear patterns. Clean debris from the tread monthly to maintain traction and prevent buildup that reduces heat dissipation. Do not use solvents on the Cushothane XL material. The wheel typically lasts 18 to 36 months depending on duty cycle intensity. Replace immediately if the polyurethane separates from the steel core.
Q: What temperature range can the SU 621-XL-A handle without performance degradation?
A: The SU 621-XL-A Cushothane XL polyurethane tread is designed to operate in ambient temperatures from -10 degrees F to +130 degrees F. Above 130 degrees F, the material begins to soften and adhesion to the steel core may weaken. Below -10 degrees F, the tread hardens and traction is reduced. Do not use in extreme temperature environments without OEM approval.
Q: Is the SU 621-XL-A wheel compatible with my lift truck that originally used a different brand wheel?
A: Cross-compatibility depends on bore diameter, width, and bolt pattern. The SU 621-XL-A has a 1.875 inch ID bore and 4.19 inch width. If your original wheel shares these specs and the same bolt mounting pattern, the SU 621-XL-A will fit. Verify by measuring the existing wheel diameter, width, bore ID, and counting bolt holes. Contact the equipment manufacturer if you are uncertain.