Product Description
Load Wheel Assembly
Frequently Asked Questions
Q: What does the A designation mean, and what comes assembled in the SU S652-A package?
A: The A suffix indicates this is an assembly unit ready for installation, not just a wheel alone. The SU S652-A includes the load wheel, mounted bearings, hub components, and all fasteners required for axle installation. This is a bolt-on replacement; you do not need to purchase or assemble separate bearings. The wheel-only SU S652 requires separate bearing and hub assembly by a technician. The A version saves labor time and reduces assembly errors.
Q: Is the SU S652-A assembly compatible with trucks that use the SU S650-A assembly?
A: The S652-A and S650-A are different product lines and are not interchangeable. Installing an incompatible wheel assembly causes bearing misalignment, steering problems, and potential safety hazards. Each assembly is designed for specific truck models and axle configurations. Verify your truck documentation lists the S652-A before ordering. When replacing worn assemblies, install the same part number that came from the factory.
Q: What steps are required to install an SU S652-A assembly on my truck?
A: Lift the truck securely on jack stands to clear wheels. Remove the axle nut or retaining hardware using the appropriate wrench. Slide the old assembly off the axle completely. Align the SU S652-A bore with the axle and slide it on until the bore seating surface seats fully. Reinstall and torque the axle nut to the truck manufacturers specification, typically 60 to 150 foot-pounds. Rotate the wheel freely by hand to verify smooth operation. Do not operate the truck until all wheels are reinstalled.
Q: How do I maintain the bearings in the SU S652-A assembly?
A: If the assembly includes sealed bearings, maintenance is minimal; inspect monthly for noise and spin freely by hand. If the assembly uses open bearings, grease per your truck manual specifications, typically every 250 to 500 operating hours. Use only the lubricant grade specified in your truck documentation; incorrect grease causes bearing overheating and premature failure. If you hear grinding or detect lateral movement in the wheel, the bearings are damaged and the assembly must be replaced.
Q: Can the wheel be separated from the SU S652-A bearing assembly for replacement?
A: The wheel is press-fitted to the hub and cannot be safely separated without specialized press equipment. Attempting to remove it risks bearing and bore damage. For field repairs, replace the entire SU S652-A assembly. Only service centers with proper wheel pressing equipment should attempt hub reuse, and only after confirming bearing condition is acceptable. Cost of replacement labor usually justifies simply installing a new assembly.
Q: How long should an SU S652-A assembly last before it requires replacement?
A: In standard warehouse service, expect 2000 to 4000 operating hours before replacement is necessary. Outdoor or rough-surface operation reduces this to 1000 to 2000 hours due to accelerated polyurethane wear and bearing stress. Overloading the truck or operating with misaligned axles drastically shortens assembly lifespan. Monitor wheel diameter monthly; when it drops 0.25 inches below nominal or visible cracks appear, plan replacement. Preventive replacement is more cost-effective than emergency repairs.