Product Description
Load Wheel
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 |
Frequently Asked Questions
Q: What are the complete specifications for the SU S621 wheel and what makes it different from larger diameter wheels?
A: SU S621 is a 3.25 inch diameter by 4.19 inch width wheel made from Cushothane XL material. Key specifications include 1.875-inch inside diameter, 1.18-inch bore depth, 2.0467-inch bore outside diameter, and metric equivalents of 82.55mm by 106.43mm. This smaller diameter wheel is designed for precision handling in confined spaces. The Cushothane XL material provides superior grip on smooth concrete floors compared to standard polyurethane.
Q: Which truck models and configurations use the SU S621 wheel?
A: SU S621 is primarily used on compact pallet jacks, hand-powered stackers, and electric order-pickers that operate in narrow aisles. The wheel also fits some electric walkie stackers and platform trucks. Do not assume compatibility based on diameter alone, as bore size and hub width must match exactly. Verify your equipment by measuring the existing wheel bore or consulting the equipment serial number plate.
Q: How do I diagnose bearing wear in the SU S621 wheel hub and what are the replacement steps?
A: Bearing wear symptoms include audible grinding noise during operation, wobbling of the wheel when pushed by hand, or difficulty rotating the wheel by hand when the equipment is lifted. Remove the retaining clip from the axle end using a flathead screwdriver. Slide the worn wheel off the shaft. Press the new SU S621 wheel onto the axle shaft using steady hand pressure or a soft rubber mallet. Reinstall the retaining clip.
Q: What load capacity does the SU S621 wheel support and in what environments is it rated for use?
A: SU S621 wheels support a maximum load of 600 pounds per wheel when used on a four-wheel equipment configuration. Rated for indoor warehouse use from 0 degrees Celsius to 50 degrees Celsius. The Cushothane XL material provides excellent grip on wet concrete and oily surfaces. Do not use outdoors or in environments where temperature exceeds 60 degrees Celsius without requesting a high-temperature variant.
Q: What is the expected lifespan of the SU S621 wheel and when should it be scheduled for replacement?
A: Average lifespan is 2 to 3 years under continuous daily use, or 4 to 5 years under intermittent use. Schedule replacement when wheels lose grip and the equipment slips on smooth surfaces, when polyurethane thickness reduces to less than 1/2-inch, or when visible cracks appear. Inspect wheels every 500 hours of operation. Smaller wheels like SU S621 wear faster than larger wheels because they complete more rotations to cover the same distance.