Product Description
SU S9139-XL-A Load Wheel Assembly is a replacement load wheel for Superior electric lift trucks, featuring a polyurethane tread, aluminum heat-sink hub, sealed precision bearings, and cross-reference compatibility with Superior S9139 and SUS9139-XL-A part numbers.
Specifications
Material & Construction
| Tread Material | Polyurethane compound |
| Finish/Coating | Polyurethane-bonded tread with machined aluminum or steel hub |
Part Numbers
| Manufacturer Part Number | SU S9139-XL-A |
| Cross-Reference Part Numbers | Replaces Superior S9139, equivalent to SUS9139-XL-A |
Frequently Asked Questions
Q: What are the cross-reference part numbers for the SU S9139-XL-A load wheel?
A: The SU S9139-XL-A is directly equivalent to Superior S9139 and SUS9139-XL-A. Always verify the suffix designation (XL-A) on your lift truck documentation before ordering, as other SU S9139 variants have different hub materials and bearing configurations that are not interchangeable.
Q: What hub material does the SU S9139-XL-A use and why does it matter?
A: The SU S9139-XL-A features an aluminum heat-sink hub with sealed precision bearings. The aluminum design dissipates heat better than composite hubs and supports higher load cycles in heavy-duty warehouse environments. If your truck experiences overheating symptoms or runs continuously for extended shifts, this thermal dissipation advantage reduces bearing wear.
Q: Can I replace a composite hub load wheel with the SU S9139-XL-A aluminum version?
A: No, do not mix hub materials on the same lift truck. If your truck originally came with composite hubs, replacing with the aluminum hub version may create uneven load distribution and stress on the steering axle. Check your original equipment documentation or contact the truck manufacturer to confirm which hub type is approved for your specific model and serial range.
Q: What maintenance is required for the sealed precision bearings?
A: Sealed precision bearings require no lubrication during normal operation. Inspect the seals quarterly for signs of grease leakage or contamination. If bearings become noisy or rough during rotation, they have likely failed internally and the entire wheel assembly must be replaced. Do not attempt to repack or clean sealed bearings.
Q: How do I diagnose if my load wheel tread is worn and needs replacement?
A: Worn polyurethane tread reduces traction and increases stopping distance on smooth warehouse floors. Visual indicators include shiny or glazed tread surface, visible wear patterns, or tread depth less than 0.5 inches. Test by applying pressure: if you can dig your fingernail into the tread, replacement is overdue. Uneven wear on one side suggests alignment issues with the lift truck frame.
Q: What is the maximum load capacity and operating temperature for the SU S9139-XL-A?
A: Load capacity depends on the lift truck model, not the wheel alone. Verify the truck nameplate for maximum rated load. Operating temperature range for polyurethane tread is -10 degrees Fahrenheit to +140 degrees Fahrenheit. In freezer environments below -10 degrees, the tread hardens and loses grip; contact Superior for low-temperature wheel options.