Product Description
LOAD WHEEL ASSEMBLY
Frequently Asked Questions
Q: What is the difference between the SU S850-A and the SU S850?
A: The SU S850-A designation indicates a complete load wheel assembly including the wheel, bearing, and hub. The SU S850 typically refers to the wheel core alone. Verify your truck service manual to confirm whether you need a complete assembly (SU S850-A) or replacement wheel only. Ordering the wrong configuration will result in fitment issues and downtime.
Q: Is the SU S850-A interchangeable with other SU S850 variants?
A: Not without verification. The SU S850-A is an assembly part number. Other variants such as SU S850, SU S850 XL, and SU S850-XL have different dimensions and load ratings. Always check your truck nameplate and service manual before substituting parts. Cross-reference the bearing bore, hub diameter, and wheel dimensions. Mismatched wheels cause uneven handling and accelerated wear.
Q: What components are included in the SU S850-A assembly?
A: The SU S850-A is specified as a load wheel assembly but detailed component breakdown is not available in standard documentation. The assembly includes a polyurethane wheel and sealed ball bearing on a steel hub. Contact your OEM with the truck serial number to confirm exact bearing bore, hub material, and axle compatibility before ordering. Do not assume SU S850-A contains the same bearing as other SU S850 variants.
Q: How do I diagnose a failed SU S850-A?
A: Lift the truck and spin the wheel by hand. If it does not spin freely, makes grinding or clicking sounds, or wobbles excessively on the axle, the bearing or hub is damaged. Inspect the tread for flat spots, deep cracks, or chunks missing. If the wheel locks up during operation or the truck pulls to one side, the SU S850-A assembly must be replaced immediately. Do not attempt to repair sealed bearings.
Q: What is the maintenance requirement for the SU S850-A?
A: The SU S850-A sealed bearing is maintenance-free. Weekly visual inspection for tread damage, cracks, and chunks is required. Monthly bearing noise and spin tests will identify early failure. Do not disassemble the assembly or attempt to relubricate sealed bearings. If bearing seal fails or tread wears to 0.5 inches, replace the entire SU S850-A assembly. Lifespan is typically 2 to 4 years under standard warehouse duty.