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 are the exact wheel dimensions for SU 684-A?
A: SU 684-A is an 8.000 inch diameter x 4.000 inch width load wheel assembly (203.20mm x 101.60mm). Outside diameter is 8.000 inches, inside diameter is 2.25 inches, width side to side is 4.000 inches, bore depth is 0.63 inches, and bore outside diameter is 2.4404 inches.
Q: Is SU 684-A a direct replacement for other brand load wheel assemblies?
A: SU 684-A provides OEM-equivalent load wheel assembly performance for electric lift trucks. To confirm compatibility with your specific lift truck model and serial range, verify the bore diameter (2.4404 inch), width (4 inch), and mounting configuration match your current assembly before installation.
Q: Can SU 684-A be installed without removing other suspension components?
A: Most SU 684-A installations are plug-and-play replacements if your lift truck uses standard 8x4 wheel mounting. However, check your truck frame for any custom brackets or load cell arrangements that may require the wheel assembly to be swapped out completely. If your truck has load sensors or integrated bearing designs, the assembly may need to be replaced as a unit rather than the wheel alone.
Q: What is the typical service life of the SU 684-A load wheel assembly?
A: Service life depends on load cycle frequency, floor surface conditions, and maintenance. Under normal industrial use with proper bearing lubrication and regular cleaning, expect 18 to 36 months before bearing wear or wheel degradation requires replacement. Concrete floors and continuous loaded operation reduce service life significantly.
Q: How do I know if SU 684-A needs replacement?
A: Replace SU 684-A if you observe: wheel wobble or side-to-side movement at the bore, visible flat spots or chunks missing from the wheel surface, grinding noise during operation, difficulty steering, or bearing play when manually spinning the wheel. Any of these indicate the assembly needs replacement to prevent lift truck instability and damage.
Q: What tools are required to install SU 684-A?
A: Installation requires: a lift or jack capable of supporting the truck frame safely, a socket or wrench set for the axle bolt (typically 9/16 inch or M14), and possibly a bearing puller if the assembly includes a pressed bearing. Always de-energize the lift truck and verify it is stable before removing or installing the wheel assembly.