SU S9149-XL-A

Frequently Asked Questions

Q: What does a 97 Shore A tread hardness rating mean for performance?
A: 97 Shore A is a very hard polyurethane compound designed for maximum load handling and minimal rolling resistance. It resists penetration by sharp objects better than softer compounds and maintains its shape under sustained high loads. The tradeoff is reduced grip on slippery surfaces compared to softer compounds. Use 97A where you need durability and load capacity in normal dry to lightly damp conditions.

Q: How does the alloy steel core differ from standard steel cores?
A: The alloy steel core in the SU S9149-XL-A is engineered for enhanced strength and fatigue resistance at high loads and speeds. The one-piece machined hub reduces assembly stress points and ensures perfect concentricity. Alloy composition provides better impact resistance and vibration damping than mild steel, reducing noise and extending bearing life under continuous heavy-use conditions.

Q: What are precision ground sealed bearings and why do they matter?
A: Precision ground sealed bearings are factory-fitted and sealed at the bearing raceway, preventing dirt and moisture ingress. Grinding to tight tolerances ensures minimal radial play and smooth rotation. Sealed bearings eliminate the need for field repacking and reduce maintenance labor. This design is ideal for high-speed continuous operations and environments where bearing contamination is a concern.

Q: Is the SU S9149-XL-A suitable for lift trucks used in wet environments?
A: The 97 Shore A compound is not optimized for wet floors due to reduced grip. If your truck operates primarily in wet areas, cold storage, or on wet concrete, select the SU S9149-EZ-A instead, which features a High Traction compound designed for those conditions. The SU S9149-XL-A excels in dry to lightly damp environments with heavy loads and continuous use.

Q: What is the installation process for the SU S9149-XL-A assembly?
A: Lower the truck fully and secure with mechanical locking blocks. Remove the four bolts securing the old wheel assembly. Slide the new SU S9149-XL-A assembly onto the axle, aligning the hub bore. Install bolts finger-tight first, then torque to the specification in your equipment manual (typically 40 to 65 foot-pounds depending on bolt size). Verify the wheel spins freely without binding. Test on the floor before returning to service.

Q: How do I monitor bearing condition and when should bearings be replaced?
A: Spin the wheel by hand monthly; bearings should rotate freely without grinding noise or vibration. Listen while the truck is operating; grinding, squealing, or clicking indicates bearing degradation. If bearings are sealed units in the assembly, replacement requires purchasing a new complete assembly. Do not attempt to repack sealed bearings. Replace the assembly immediately if bearing noise develops to prevent complete bearing failure and axle damage.