Product Description
The Liftsplus.com SU 666-XL-A Poly Load Wheel Assembly is engineered for electric lift trucks and pallet jacks requiring high-performance polyurethane wheels. Features include proprietary XL3 thermal bonding, precision steel hub, sealed bearings, and assembly integrity suited for severe-duty warehouse applications.
Specifications: 6.000 inch diameter x 4.000 inch width (6.000" x 4.000" | 6 x 4 wheel | 6 x 4 | 152.40mm x 101.60mm)
Specifications
Material & Construction
| Polyurethane Grade | Premium-grade, American-made polyurethane compound |
| Core Material | Steel hub, machined and finished |
Part Numbers
| OEM Part Number | SU 666-XL-A |
| Manufacturer Part Number | SU 666-XL-A |
Wheel Dimensions
| Material | Cushothane EZ |
| Outside Diameter | 6 |
| Inside Diameter | 2.5 |
| Width Side to Side | 4 |
| Tread Profile | Angle |
| Bore Depth | 0.68 |
| Hub Width | 4 |
| Bore Outside Diameter | 2.8341 |
Frequently Asked Questions
Q: What is the difference between the SU 666-XL-A and the standard SU 666-XL wheel assembly?
A: Both the SU 666-XL-A and SU 666-XL have the same dimensions (6 inch diameter x 4 inch width) and XL3 bonding technology. The -A variant uses premium-grade American-made polyurethane (Cushothane EZ compound) and features a machined and finished steel hub. This variant offers slightly higher durability and is preferred for severe-duty applications requiring consistent quality and longevity.
Q: Is the SU 666-XL-A compatible with the same lift truck models as SU 666-XL?
A: Yes. The SU 666-XL-A has identical dimensions and mounting interface to the SU 666-XL. Both are 6 x 4 wheels with 2.5 inch inside diameter. If your truck currently uses or requires a 6 x 4 wheel assembly, the SU 666-XL-A is a direct replacement. Verify your truck model accepts a 6 x 4 configuration before ordering.
Q: Why is the Cushothane EZ polyurethane compound in the SU 666-XL-A superior for warehouse use?
A: Cushothane EZ is a premium polyurethane formulation engineered for impact resistance and load-cycle durability. It resists compression set, which keeps the wheel shape stable even after long parking periods. This compound also provides better traction on varied floor types and extends tread life compared to standard polyurethane. The trade-off is higher cost, justified by longer replacement intervals.
Q: How do I verify that the machined steel hub on the SU 666-XL-A will fit my truck frame?
A: The SU 666-XL-A hub has a 2.5 inch inside diameter. Measure your existing wheel assembly hub bore and compare. Also verify bolt hole pattern and spacing match. If your truck manual specifies a 2.5 inch bore and you have the correct mounting pattern, the assembly is compatible. When in doubt, contact the lift truck manufacturer with your serial number.
Q: What is the typical warranty or expected lifespan for an SU 666-XL-A in continuous warehouse operation?
A: Expect 3 to 5 years of service life in heavy-duty warehouse conditions, depending on load cycles, floor type, and maintenance. The premium Cushothane EZ compound and machined hub are rated for extended durability. Perform visual inspections monthly and check bearing condition quarterly. Replace the assembly when tread flattens or bearings develop play or noise.
Q: Can the SU 666-XL-A wheel tread be retreaded or resurfaced instead of replacing the entire assembly?
A: Retreading polyurethane industrial wheels is not recommended and is not a standard service. The XL3 bonding and Cushothane EZ compound are engineered as a sealed system. Grinding or sanding the tread risks damaging the bond or altering wheel balance. It is more cost-effective and safer to replace the entire assembly when tread wears below 1/8 inch than to attempt resurfacing.