SU 9109

Frequently Asked Questions

Q: What is the difference between SU 9109 and SU 9109-A?
A: SU 9109 is the standard load wheel assembly with polyurethane tread and machined steel hub. SU 9109-A is the equivalent assembly variant. Both use double-sealed precision deep groove bearings with axle pin mounting. Verify your electric pallet truck model documentation to confirm which variant your equipment requires, as they are functionally interchangeable in most applications.

Q: What bearing type does SU 9109 use and why does it matter?
A: SU 9109 uses double-sealed precision deep groove bearings. The double seals prevent water and dust ingress, which is critical for warehouse and outdoor electric lift truck use. If you notice grinding noise or the wheel does not spin freely, the bearings have failed and the entire assembly must be replaced. Do not attempt to repack or repair sealed bearings.

Q: Can I replace just the polyurethane tread on SU 9109?
A: No. SU 9109 is a complete assembly and the tread is molded to the machined steel hub. If the polyurethane tread is worn or damaged, you must replace the entire load wheel assembly. Tread wear typically occurs after 2 to 4 years of regular warehouse use depending on floor surface and load frequency.

Q: How do I install SU 9109 on my electric pallet truck?
A: SU 9109 mounts via axle pin mounting. First, remove the cotter pin and axle pin from the truck frame. Slide the old wheel assembly off the axle. Position the new SU 9109 assembly onto the axle, insert the axle pin, and secure with a new cotter pin. Ensure the wheel spins freely with no binding or wobble. Do not apply lubricant to the bearings as they are sealed and self-contained.

Q: What load capacity does SU 9109 support?
A: SU 9109 is rated for electric lift truck applications with typical load ratings of 4,000 to 6,500 pounds per truck depending on wheel configuration and truck model. Always verify your truck manufacturer documentation for exact load limits. Exceeding rated capacity will accelerate bearing failure and tread wear.

Q: How do I know if SU 9109 bearings are failing?
A: Signs of bearing failure include grinding or squealing noise when the wheel rotates, the wheel becoming difficult to spin by hand, or visible lateral play when you grasp the wheel and move it side to side. If you observe any of these symptoms, the wheel assembly must be replaced immediately. Continued operation will damage the axle and truck frame.