Product Description
Load Wheel Assembly
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
| Material | |
| Outside Diameter | 8 |
| Inside Diameter | 2.25 |
| Width Side to Side | 4 |
| Tread Profile | |
| Bore Depth | 0.63 |
| Hub Width | |
| Bore Outside Diameter | 2.4404 |
Frequently Asked Questions
Q: What is the difference between the SU S684-EZ-A load wheel assembly and a standalone wheel?
A: The SU S684-EZ-A is a complete load wheel assembly that includes the 8x4 EZ Compound wheel, bearings, and sometimes the caster housing. A standalone wheel is only the rubber and core. The assembly is pre-assembled and ready to bolt onto the truck chassis, saving installation labor. If you are buying a wheel only, you need to manually press it onto an existing axle shaft and verify bearing fit.
Q: Is the SU S684-EZ-A assembly compatible with my existing truck caster forks?
A: Compatibility depends on your caster fork bolt pattern and axle interface. The SU S684-EZ-A wheel itself is 8x4 with a 2.25 inch bore ID, which fits standard industrial lift truck axles. However, the caster housing or swivel joints may have different bolt patterns or thread sizes. Before ordering, verify the bolt hole spacing (typically 2.25 inches or 2.5 inches on center) and axle shaft diameter match your truck. Contact the supplier with your truck model number.
Q: How do I know if the SU S684-EZ-A assembly includes bearings and bushings?
A: Check the product documentation or invoice. If it says assembly, it typically includes bearings and inner/outer races. If it says wheel only, it does not include bearings. When you receive the assembly, spin the wheel by hand; it should rotate smoothly for 10-15 seconds after a light spin. If it stops immediately or feels gritty, the bearings may be dry or defective. Request replacement before installation.
Q: What maintenance is required for the SU S684-EZ-A load wheel assembly?
A: Inspect the wheel monthly for flat spots, cracking, or debris embedding. Spin the wheel by hand to confirm smooth rotation and no grinding noise. If bearings are open-lubricated, repack them every 12-18 months with the OEM-specified grease type (typically NLGI 2 lithium or polyurea). If the assembly uses sealed bearings, do not attempt to repack. Monitor for excessive play in the caster swivel joint; if it develops movement or noise, replace the assembly.
Q: What load rating should the SU S684-EZ-A assembly support?
A: The SU S684-EZ-A with EZ Compound rubber typically supports 2800-3200 pounds per wheel under normal warehouse conditions. The exact rating depends on bearing type, caster swivel strength, and truck frame rigidity. Do not exceed the total truck GVWR or individual caster load limits listed in your truck manual. Overloading the assembly causes premature bearing wear, wheel delamination, and caster swivel failure, compromising truck safety.