SU S9159

Frequently Asked Questions

Q: What are the key specifications of the SU S9159 wheel assembly?
A: The SU S9159 is a 4.00 inch diameter by 2.00 inch width polyurethane load wheel bonded to a machined steel hub. It features Shore A85 hardness polyurethane, a flat non-marking tread profile, sealed bearings, and an 800 lb rated load capacity per wheel. The wheel is designed for drop-in axle mounting on electric lift trucks. The steel hub is precision-machined to OEM tolerances, and sealed bearings ensure reliable operation in diverse warehouse conditions.

Q: What is the 800 lb per-wheel load rating and how does it apply to my truck?
A: The 800 lb per-wheel rating means each SU S9159 wheel is engineered to support 800 lbs under full load. For a four-wheel pallet jack, total load capacity would be 3200 lbs distributed across all wheels. Your specific jack has a nameplate-rated capacity, which typically falls between 2500 and 5500 lbs depending on model. Do not exceed your truck nameplate limit; the wheel rating ensures it can handle duty-cycle demands within rated truck capacity. Overloading damages wheels and creates safety hazards.

Q: How does the flat non-marking tread differ from other wheel profiles?
A: The flat non-marking tread has a smooth, flat contact surface with minimal texture or deep grooves. This design prevents black scuff marks on epoxy, polished, and sealed concrete floors common in retail and clean manufacturing spaces. The flat profile distributes load evenly across the floor contact area, reducing floor damage. Contrast this with radius or rounded tread profiles that concentrate pressure at the center, potentially marking delicate flooring. Non-marking wheels are essential for facilities with logo flooring or pristine appearance requirements.

Q: Which electric lift truck models use the SU S9159 wheel?
A: The SU S9159 fits various electric lift truck models from Crown, Toyota, Raymond, Yale, Hyster, and other OEMs that use a 4 x 2 inch wheel specification with drop-in axle mounting. Verify your current wheel dimensions and axle bore diameter before ordering. A micrometer or caliper should confirm 4.00 inch diameter and 2.00 inch width. If your truck uses a 3 x 2 or 5 x 2 wheel, this unit will not fit. Check your truck nameplate or measure existing wheels to confirm compatibility.

Q: What maintenance extends the life of the SU S9159 wheel?
A: The sealed bearings are factory-sealed and do not require regular greasing. Keep tread clean of debris, especially sharp metal fragments or gravel that can cut polyurethane. Inspect wheels monthly for chunks, flat spots, or uneven wear. Verify axle bolts remain tight; vibration-induced loosening can cause bearing damage. Operate within rated load capacity to prevent stress failure. Store wheels indoors in moderate temperatures; extreme heat or prolonged UV exposure can degrade polyurethane.

Q: How do I know when the SU S9159 wheel needs replacement?
A: Replace the wheel when you observe flat spots, visible chunks missing from the tread, or uneven wear patterns. Audible rumbling or grinding when rolling indicates bearing or hub damage; replace immediately to prevent complete wheel failure. If the truck drifts laterally under load, one wheel is likely worn or damaged. Loss of traction on smooth floors or increased effort required to push the truck are also indicators. Preventive replacement every 24 to 36 months in heavy-use environments reduces unexpected downtime.