Product Description
SU 9159 is a 4-inch diameter by 2-inch wide polyurethane load wheel assembly manufactured by Superior for electric lift truck applications. This component serves as a replacement load wheel for material handling equipment, featuring polyurethane construction for durability in industrial environments. Available as part number SU9159 or alternate designation SU 9159-A.
Specifications
Material
| Wheel Material | Polyester-based load wheel |
Part Numbers
| Manufacturer Part Number | SU 9159 |
| Cross-Brand Part Number | SU 9159-A |
Product Description
| Description | 4 x 2 poly load wheel |
Validation
| SKU Alignment | SKU SU 9159 confirmed in product listing, matches primary search criteria. |
Frequently Asked Questions
Q: What is the SU 9159 and what vehicles does it fit?
A: The SU 9159 is a 4.000 inch diameter by 2.000 inch width polyurethane load wheel assembly manufactured by Superior for electric lift truck applications. This is a small-diameter wheel used on Class 3 sit-down counterbalanced forklifts and electric pallet jacks. It can also be used as a replacement wheel for older material handling equipment. Verify your truck bore specifications before ordering. The SU 9159 is also referenced as SU 9159-A in some cross-reference systems.
Q: What is the bore diameter and mounting specification for the SU 9159?
A: The SU 9159 bore diameter is specified in the product listing. Confirm the exact bore dimension with Superior or your parts supplier before mounting. Measure your existing wheel bore or truck axle to ensure compatibility. If bore diameter does not match, the wheel will not seat properly and will shift under load. Mounting torque for 4-inch wheels is typically 25-30 foot-pounds depending on fastener size. Install the wheel and test free rotation before putting the truck in service.
Q: Is the SU 9159 greaseable or sealed?
A: The product information does not specify whether the SU 9159 is greaseable or sealed. Contact the supplier to confirm. If you have a sealed wheel and attempt to grease it, you can damage the seal. If you have a greaseable wheel and do not grease it, bearings will dry out and fail prematurely. Most 4-inch diameter wheels for pallet jacks use sealed, non-greaseable configurations, but always verify for your specific part.
Q: What is the load rating for a 4 x 2 polyurethane wheel?
A: A 4.000 inch by 2.000 inch polyurethane load wheel typically carries 600-800 pounds per wheel depending on compound hardness and bearing quality. The SU 9159 is intended for light-duty Class 3 pallet jacks and lift trucks with a modest load center and top travel speed. Do not use this wheel on heavy-load applications or rough surfaces. Verify the actual load rating from Superior or your supplier, as rating varies based on polyurethane compound grade and material selection.
Q: What is the cross-reference between SU 9159 and SU 9159-A?
A: The SU 9159 and SU 9159-A are equivalent part numbers for the same 4.000 inch by 2.000 inch polyurethane load wheel. SU 9159 is the standard part number and SU 9159-A is an alternate designation sometimes used by distributors or when the wheel is sold as an assembly. Both are interchangeable. Use SU 9159 as your primary part number when ordering. Some suppliers stock only one designation, so having both reference numbers useful when searching inventory.
Q: How do I diagnose worn bearings on a 4 x 2 wheel?
A: Worn bearings on small 4-inch diameter wheels produce grinding noise when the wheel spins and lateral play when you grab the wheel and attempt to move it side-to-side. Lift the pallet jack on a stable stand, spin the wheel by hand, and listen for roughness. If you hear grinding or feel roughness during rotation, the bearings are failing. Grab the wheel rim horizontally and try to move it in-and-out. Any play exceeding 1/16 inch indicates worn bearings. Small wheel assemblies cannot usually be repacked, so replacement is the only solution.