Product Description
Guide Wheel Assembly 95A
Frequently Asked Questions
Q: What is the difference between a load wheel and a guide wheel assembly?
A: Load wheels support the full weight of the truck and cargo and are mounted on the drive axle. Guide wheels steer and stabilize the truck and typically carry no load. The SU S623-A is a guide wheel assembly rated at 95A Shore durometer hardness, meaning it is designed for steering and directional control, not load-bearing. Do not use it on load-wheel positions.
Q: Can I use the SU S623-A guide wheel on my drive or load-wheel positions?
A: No. Using a guide wheel on a load position will cause bearing failure, tread chunking, and reduced truck stability under load. Guide wheels have different hub geometry and lighter bearing races optimized for steering. Always use guide wheels only in the guide-wheel positions specified in your truck documentation.
Q: What does the 95A hardness rating mean for the SU S623-A?
A: 95A Shore durometer indicates the tread hardness on the Shore A scale. At 95A, the tread is softer than high-duty polyurethane (97A or higher), providing good grip and responsive steering without excessive wear. This hardness is optimal for steering wheels that require maneuverability and reduced drag.
Q: How do I install the SU S623-A guide wheel assembly?
A: Position the truck so the guide wheel is accessible. Remove the axle bolt or cotter pin from the wheel mounting shaft. Slide the old guide wheel off. Align the new wheel hub bore with the axle shaft and slide it on until seated. Reinstall the axle bolt and secure with a cotter pin or lock washer. Verify the wheel spins freely and the steering response is normal.
Q: What is the expected lifespan for SU S623-A guide wheels?
A: Guide wheels typically last 2-4 years depending on usage. Inspect every month for tread wear, bearing play, or steering resistance. If the wheel becomes flat, the bearing binds, or steering becomes sluggish, replace the assembly. Guide wheel wear is usually gradual, so maintain a spare on hand for emergency replacement.
Q: Does the SU S623-A require lubrication or bearing maintenance?
A: No. The bearing is factory sealed and does not require lubrication or repacking. If bearing play develops or the wheel becomes noisy, the bearing race is worn and the entire wheel assembly must be replaced. Do not attempt to reservice or re-seal the bearing.
