Product Description
Load Wheel Assembly
Frequently Asked Questions
Q: Is the SU 673-XL-A a direct replacement for older SU 673 series assemblies?
A: In most cases, yes. The SU 673-XL-A uses the same 2.238 inch bore and standard bolt spacing as the original SU 673. However, if your truck has non-standard axle widths or uses metric components, verify dimensions before ordering. Consult your truck manual for the part compatibility table.
Q: What tools and skills are required to install the SU 673-XL-A?
A: Installation is a 20-minute task requiring a socket set, jack, and jack stands. Support the truck safely, remove the cotter pin and axle nut, and slide off the old assembly. Slide the new SU 673-XL-A onto the axle, reinstall the nut, and torque to 45-50 foot-pounds. Install a new cotter pin. No special bearing tools are needed for bolt-on replacement.
Q: Do I need to lubricate the SU 673-XL-A bearings after installation?
A: No. The SU 673-XL-A comes with sealed pre-lubricated bearings. They require no additional grease or oil. Over-lubrication can overpressurize the seals and cause leakage. Check the bearing seals for damage after installation; if broken or leaking, the assembly must be replaced (bearings cannot be re-sealed in the field).
Q: What is the maximum tire pressure or operating pressure for this assembly?
A: The SU 673-XL-A is a solid (non-pneumatic) wheel assembly and does not use air pressure. It operates at ambient pressure. Do not attempt to inflate. If you see air escaping from the wheel, the bearing seal has failed and the assembly requires replacement.
Q: How do I diagnose if the sealed bearings are failing?
A: Signs of bearing failure include grinding or squealing noise, wheel resistance during rotation, visible heat (wheel feels hot to touch), or side-to-side wobble. Once bearings begin to fail, replace the entire SU 673-XL-A assembly. Continued operation risks wheel lockup and loss of steering control.
Q: How often should the SU 673-XL-A be inspected for wear?
A: Inspect monthly under normal use (40+ operating hours per week). Check for flat spots, chunks missing from the tread, cracking, or uneven wear. Look for oil or grease leaking from bearing seals. Rotate wheels front-to-back every 500 hours to even wear. Replace when tread depth is less than 1/8 inch or damage is visible.