Product Description
Technical specification profile for the SU 674-XL-A Load Wheel Assembly, a heavy-duty, polyurethane-bonded load wheel, optimized for electric lift truck and pallet jack systems operating in harsh industrial environments. Design includes XL3 bonded polyurethane for high wear resistance, no bond separation guarantee, and smooth tread for minimal floor marking. No cross-reference, supersedes, or equivalent OEM part numbers available from accessible sources; closest industry reference is Superior XL
Specifications: 6.000 inch diameter x 3.625 inch width (6.000" x 3.625" | 6 x 3.63 wheel | 6 x 3-5/8 | 152.40mm x 92.07mm)
Specifications
Construction
| Frame Material | Steel core with polyurethane over-mold |
Industry Reference
| Cross-Industry Part Number | Superior XL series load wheels L500674RD4 (6x3.654 inch model, not identical but likely related); SU 674-XL-A may be aftermarket equivalent to OEM reference L500674RD4 |
Part Numbers
| OEM Part Number | SU 674-XL-A |
Quality
| Bonding Guarantee | No bond failures guaranteed due to proprietary XL3 steel bonding |
Wheel Dimensions
| Material | Cushothane XL |
| Outside Diameter | 6 |
| Inside Diameter | 2.238 |
| Width Side to Side | 3.625 |
| Tread Profile | 3/8 Radius |
| Bore Depth | 0.669 |
| Bore Outside Diameter | 2.4384 |
Frequently Asked Questions
Q: What does the dash-A designation mean on SU 674-XL-A?
A: The dash-A indicates this is a complete load wheel assembly, not just the wheel alone. SU 674-XL-A includes the Cushothane XL wheel, steel hub, sealed bearings, and mounting hardware pre-assembled. This is ready to install directly onto your truck frame. If you need only the replacement wheel for an existing hub, order SU 674-XL instead.
Q: What is the no bond separation guarantee for SU 674-XL-A?
A: Superior Wheel guarantees that the XL3 bonding system will not separate (delaminate) the polyurethane tread from the steel hub during normal heavy-duty operation. This guarantee covers manufacturing defects and normal warehouse use. Damage from external impact, running over sharp objects, or intentional misuse is not covered. This guarantee is exclusive to the XL series and does not apply to standard or competitor wheels.
Q: Are there cross-references or equivalent part numbers for SU 674-XL-A?
A: SU 674-XL-A is a Superior proprietary assembly with no direct OEM equivalents. The closest industry reference is Superior XL series wheels such as L500674RD4 (6 x 3.654 inch model), which is similar in size and duty rating but not identical in bore or mounting specs. Superior XL assemblies are not directly interchangeable with competitor brand assemblies. Always order by exact part number to ensure proper fitment.
Q: What is the frame material and construction of SU 674-XL-A?
A: SU 674-XL-A features a steel core hub with polyurethane over-mold construction. The steel provides rigidity and load support; the polyurethane provides traction and cushioning. This hybrid construction is stronger than hollow hub designs and resists cracking under shock loads common in electric reach truck operation. Sealed bearings are press-fit into the steel hub and require no maintenance.
Q: How do I diagnose bearing failure in SU 674-XL-A?
A: Listen for grinding or squealing noise during rotation. Spin the wheel by hand; it should rotate smoothly for 10 to 15 seconds without resistance. If it stops quickly or feels gritty, the bearing is likely degraded. Check for side-to-side play (wobble) on the axle; excessive play indicates worn or failing bearings. Do not attempt to relubricate sealed bearings. Replace the assembly if bearing failure is diagnosed. Operating on a bad bearing risks hub damage and truck instability.
Q: What is the installation procedure for SU 674-XL-A?
A: Clean the axle pin and truck frame mounting points with a dry cloth. Slide the assembly onto the axle pin until the bore seats fully against the frame. Ensure the wheel spins freely and shows no wobble. Install the locking pin or bolt (size per your truck manual) and tighten securely. Do not over-tighten; this can crack the hub or damage sealed bearings. Verify clearance between the tire and frame before operating. Test rotation by hand after installation.