Product Description
Load Wheel Assembly
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
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 |
| Tread Profile |
Frequently Asked Questions
Q: What components are included in the SU S621-A assembly kit and how does it simplify installation versus individual parts?
A: SU S621-A includes the Cushothane XL wheel, sealed bearing assembly, steel hub, retaining clip, and pre-installed axle shaft collar. This is a complete plug-and-play assembly that eliminates sourcing bearings, hubs, and clips separately. Installation time is reduced from 45 minutes to approximately 5 minutes. The assembly ensures proper bearing preload and alignment, which reduces the risk of incorrect installation that causes premature bearing failure.
Q: Is the SU S621-A assembly compatible with both metric and imperial axle shaft sizes?
A: SU S621-A is designed for equipment using metric-dimensioned axle shafts with the bore specifications listed. If your equipment uses imperial shafts or non-standard bore sizes, the assembly will not fit. Measure your existing axle bore diameter and width with calipers or provide your equipment manufacturer name and model for compatibility verification. Ordering the wrong assembly results in no-fit situations that waste time and money.
Q: What safety precautions should I follow when installing the SU S621-A assembly on pallet jacks and stackers?
A: Always lower the equipment completely to the ground before starting wheel replacement. Place wheel chocks behind all wheels to prevent rolling. If replacing wheels on a raised platform, use a portable jack stand rated for the equipment weight. Do not rely on the lift mechanism alone to hold the equipment stable. Wear work gloves when handling the assembly to avoid pinching fingers. Test the wheel rotation by hand before operating the equipment.
Q: What materials and compatibility should I verify before ordering the SU S621-A assembly?
A: Verify your equipment axle bore diameter matches 1.875 inches and hub width matches 4.19 inches before ordering. Confirm your axle shaft diameter is 5/8-inch. The SU S621-A assembly uses Cushothane XL polyurethane, which provides superior slip resistance on smooth, oily, or wet concrete. If your equipment needs lower grip or operates on textured surfaces, specify standard polyurethane instead.
Q: How often should the SU S621-A assembly be replaced and what symptoms indicate it is nearing end-of-life?
A: Replace the SU S621-A assembly every 2 to 3 years under continuous use or when you observe reduced grip causing slipping on smooth floors, audible grinding from the bearing, visible polyurethane wear beyond 1/2-inch thickness, or equipment pulling to one side. Do not wait for bearing failure, which requires hub replacement. Preventive replacement avoids sudden operational failure and extends equipment reliability. Inspect assemblies every 6 months to plan replacement timing.