Product Description
Caster Wheel, Mold On, 85A
Specifications: 8.000 inch diameter x 4.000 inch width (8.000" x 4.000" | 8 x 4 wheel | 8 x 4 | 203.20mm x 101.60mm)
Specifications
Wheel Dimensions
| Outside Diameter | 8 |
| Inside Diameter | 2.25 |
| Width Side to Side | 4 |
| Bore Depth | 0.63 |
| Bore Outside Diameter | 2.4404 |
Frequently Asked Questions
Q: Is the SU S684 EZ compatible with other 8x4 mold-on wheels in the SU line?
A: The SU S684 EZ is functionally equivalent to SU S684-EZ and SU S684-A for basic fitment since they share identical dimensions (8 inch diameter x 4 inch width, 2.25 inch bore ID). However, SU S684 EZ uses standard mold-on rubber at 85A durometer, while EZ Compound variants (SU S684 EZ-A, SU S684-A) offer different wear characteristics. Always verify the original wheel compound before cross-substituting.
Q: What load capacity does the SU S684 EZ support?
A: The SU S684 EZ 8x4 mold-on wheel at 85A durometer typically supports 2500-3000 pounds per wheel depending on application and bearing configuration. This is a standard industrial caster rating for electric lift trucks. Do not exceed manufacturer load recommendations, as overloading causes premature bearing wear and sidewall degradation.
Q: Can I replace a worn SU S684 EZ wheel on an existing truck without disassembling the entire caster assembly?
A: No. The SU S684 EZ wheel is press-fit onto a 2.4404 inch OD axle shaft with a 0.63 inch bore depth. Removal requires a bearing puller or wheel press. You cannot hand-remove it. After pressing off, inspect the shaft for scoring or rust. Clean the shaft thoroughly before pressing on the replacement wheel to ensure proper bearing seating and prevent premature failure.
Q: What environment is the 85A mold-on rubber compound suitable for?
A: The 85A durometer mold-on compound on the SU S684 EZ provides good abrasion resistance for indoor warehouse and light outdoor use on smooth to moderately textured floors. It is not rated for extreme heat (above 140 degrees F sustained), oily environments without frequent cleaning, or outdoor concrete exposure in freezing conditions. For wet or oily floors, consider an EZ Compound variant.
Q: How often should I inspect the SU S684 EZ wheel for wear or damage?
A: Inspect every 500 operating hours or monthly, whichever comes first. Look for flat spotting, sidewall cracks, debris embedding, and excessive wobble when rotated by hand. If you detect more than 1/8 inch of tread wear or any sidewall delamination, replace the wheel immediately. Worn wheels cause load imbalance and accelerate bearing failure.