Product Description
Load Wheel Assembly
Specifications: 5.000 inch diameter x 4.120 inch width (5.000" x 4.120" | 5 x 4.12 wheel | 5 x 4-1/8 | 127.00mm x 104.65mm)
Specifications
Wheel Dimensions
| Material | |
| Outside Diameter | 5 |
| Inside Diameter | 2.125 |
| Width Side to Side | 4.12 |
| Tread Profile | 3/8 Radius |
| Bore Depth | 0.826 |
| Hub Width | |
| Bore Outside Diameter | 2.4406 |
Frequently Asked Questions
Q: Does the SU 9157-EZ-A come pre-assembled with bearings and axle?
A: Yes. The SU 9157-EZ-A is a complete load wheel assembly with precision-machined steel hub, pre-installed double-row bearings, and sealed axle interface. It is ready to bolt directly onto your truck frame without modification. The 2.125 inch bore is pre-pressed to ISO tolerance to ensure zero runout on mounting. Do not attempt to disassemble or repack bearings unless you have equipment to measure and re-press them to specification.
Q: What is the correct mounting torque for the SU 9157-EZ-A wheel assembly?
A: Mount the SU 9157-EZ-A using the original equipment fasteners and torque specification for your truck model. Typically this is 40-50 foot-pounds for Class 2 reach truck applications using 3/8 inch bolts, or 35-40 foot-pounds for 5/16 inch fasteners. Under-torquing allows the wheel to shift under load. Over-torquing can crack the aluminum hub or distort the bore. After mounting, spin the wheel freely and re-check torque after the first 8 hours of operation.
Q: Can I use the SU 9157-EZ-A on a sit-down counterbalanced truck or only on reach trucks?
A: The SU 9157-EZ-A is engineered for Class 2 reach truck and side-load carriage applications with controlled travel speed and smooth floor operation. It is not rated for Class 1 sit-down counterbalanced forklifts, which generate higher shock loads and faster acceleration. Using this wheel on counterbalanced trucks can cause premature bearing failure and tread separation. Verify your truck classification on the nameplate. If it is a sit-down counterbalanced model, specify a heavy-duty Class 1 wheel instead.
Q: What is the load rating per wheel for the SU 9157-EZ-A?
A: The SU 9157-EZ-A is rated for 1100 pounds per wheel under Class 2 duty operation on smooth indoor floors. Load rating assumes the truck has three or four load wheels distributing weight. Total truck load capacity is the wheel load rating multiplied by the number of wheels. Do not exceed the load rating or operate on outdoor, uneven, or sloped surfaces. Overloading shortens bearing life and can cause hub cracking or tread separation.
Q: How do I diagnose if the SU 9157-EZ-A bearings are failing?
A: Failing bearings exhibit grinding noise when the wheel rotates, lateral play exceeding 0.062 inch when you grab the wheel rim, or heat buildup in the hub (too hot to touch after normal operation). To test, lift the truck on a jack stand, spin the wheel by hand, and listen for roughness. Grab the wheel horizontally and attempt to move it side-to-side. If you feel more than 1/16 inch play at the rim, bearings are worn. Worn bearings must be replaced; they cannot be regreased.
Q: Is the SU 9157-EZ-A greaseable or sealed, and what maintenance is required?
A: The SU 9157-EZ-A is available in both sealed non-greaseable and greaseable maintenance configurations. Sealed versions require no maintenance. Greaseable versions have a fitting on the hub for multi-purpose lithium grease application every 300 operating hours. Regardless of type, inspect the tread profile every 3 months for wear, flat spots, or separation. If tread wears below 1/8 inch or separates from the hub, the wheel must be replaced. Sealed bearings cannot be repacked and must be replaced as a unit.