SU 9129

Frequently Asked Questions

Q: What is the difference between SU 9129 and SU 9129-XL load wheels?
A: SU 9129 is the standard 3.00 inch diameter load wheel with 3.66 inch tread width and 20 mm sealed precision bearing. SU 9129-XL is an extended version with larger overall dimensions for increased load distribution. Verify your truck model number before ordering, as the standard 3.00 inch fits most electric pallet jacks and rider trucks, while XL variants are for specific heavy-duty applications.

Q: Can I replace a worn SU 9129 wheel on a truck that originally came with a different brand wheel?
A: Yes, if the bolt hole pattern, bearing bore (20 mm), and axle length match. The 3.00 inch diameter and 3.66 inch width are industry-standard for electric pallet truck load wheels. Before installing, verify that the mounting bolt spacing on your truck matches the SU 9129 wheel. Use a ruler or caliper to measure bolt hole distance from the truck documentation or photo.

Q: How do I know when my SU 9129 load wheel needs replacement?
A: Replace the wheel if you observe: visible flat spots or chunks missing from the polyurethane tread, axial wobble when the wheel is spun by hand (indicates bearing wear), reduced truck acceleration or steering responsiveness, or grinding noise during operation. Polyurethane tread wheels typically last 2000 to 4000 operating hours depending on floor surface and load cycles. Check bearing condition by lifting the truck and spinning the wheel; it should rotate freely with minimal drag.

Q: What tools and steps do I need to replace an SU 9129 load wheel?
A: Tools needed: socket wrench set, wheel puller (optional, for stubborn hubs), bearing lubricant. Steps: 1) Lift the truck safely on jack stands. 2) Remove the axle bolt or cotter pin and retaining nut. 3) Slide the old wheel and hub off the axle. 4) Clean the axle of debris and old grease. 5) Slide the new SU 9129 wheel onto the axle with the bearing side first. 6) Reinstall the retaining nut and torque to manufacturer specs (typically 40-60 foot-pounds for electric trucks). 7) Verify wheel spins freely and does not wobble. 8) Lubricate the bearing with light machine oil or grease as specified in the truck manual.

Q: What are the load and speed ratings for the SU 9129 wheel?
A: The SU 9129 is rated for electric pallet truck applications with maximum load capacities typically 3000 to 6000 pounds per truck (distributed across all wheels). Operating speed should not exceed 5 miles per hour on smooth warehouse floors. The 20 mm sealed precision bearing is rated for continuous operation at 100 RPM under normal load. For heavy-duty or high-speed applications, contact manufacturer to verify rated specifications for your specific truck model.

Q: Is the SU 9129 bearing sealed, and do I need to relubricate it?
A: Yes, the 20 mm bearing is sealed and pre-lubricated at the factory. Under normal warehouse use, sealed bearings do not require periodic relubrication. However, if the wheel operates in wet, dusty, or corrosive environments, inspect the bearing seals every 6 months for damage or fluid leakage. If seals are compromised, replace the entire wheel assembly rather than attempting to re-lubricate the sealed bearing.