Product Description
Load Wheel Assembly
Specifications: 4.000 inch diameter x 2.750 inch width (4.000" x 2.750" | 4 x 2.75 wheel | 4 x 2-3/4 | 101.60mm x 69.85mm)
Specifications
Wheel Dimensions
| Material | Cushothane XL |
| Outside Diameter | 4 |
| Inside Diameter | 1.875 |
| Width Side to Side | 2.75 |
| Tread Profile | 1/4 Radius |
| Bore Depth | 0.812 |
| Hub Width | 2.75 |
| Bore Outside Diameter | 2.4404 |
Frequently Asked Questions
Q: What is the difference between the SU 143 load wheel and the SU 143-A load wheel assembly?
A: The SU 143 is the wheel only (4 x 2.75 inches, Cushothane XL material). The SU 143-A is a complete assembly that includes the wheel, hub, bearings, and axle bolt pre-installed. The 143-A assembly is ready to mount directly onto your axle without requiring separate bearing installation. Use the 143-A if you need a complete drop-in replacement; use the 143 if you are reusing your existing hub and bearings.
Q: Can I replace just the wheel portion on a SU 143-A assembly or must I buy a new complete assembly?
A: If the bearings and hub are still in good condition, you can purchase the SU 143 wheel alone and press it onto your existing 143-A hub assembly. This requires a bearing press or a qualified technician. If you do not have access to a press or are unsure about bearing condition, it is safer and faster to replace the entire 143-A assembly to avoid bearing failure later.
Q: What trucks are compatible with the SU 143-A load wheel assembly?
A: The SU 143-A (4 x 2.75 inch, Cushothane XL) fits Crown, Raymond, Toyota, and Yale lift trucks that originally came with 4 x 2.75 load wheels. Cross-reference your truck model and serial number with the nameplate to confirm wheel size. If your truck is stamped for 4 x 3 or 5 x 2 load wheels, the 143-A will not fit correctly.
Q: How do I diagnose if the bearings inside the SU 143-A assembly are failing?
A: Lift the truck slightly and spin each wheel by hand. A bad bearing will feel rough, sticky, or will not spin freely. Listen for grinding, squeaking, or clicking sounds while the wheel rolls. If the wheel develops play (looseness up and down on the axle), the bearing races are worn. If any of these conditions occur, replace the entire SU 143-A assembly rather than attempting bearing service.
Q: Is the SU 143-A assembly pre-lubricated or does it need grease before installation?
A: Most bearing assemblies ship with factory grease. Before installation, inspect the bearing seals for grease weeping. If grease is visible around the seal, the assembly is properly lubricated. Do not over-grease sealed bearings, as excess pressure can blow out the seals and cause water ingress. If the assembly appears dry, apply a light coat of bearing grease to the bore before pressing onto the axle.
Q: What is the typical lifespan of a SU 143-A assembly under normal operating conditions?
A: Under normal warehouse use (8 to 10 hours daily on dry floors), the 143-A assembly lasts 3 to 4 years before wheel or bearing replacement becomes necessary. Harsh environments (cold storage, wet floors, outdoor use) reduce life to 1 to 2 years. Inspect assemblies quarterly for sidewall cracks and bearing noise. Replace immediately if cracks appear or if bearing noise is audible.