Product Description
Caster Wheel, Poly 95A
Specifications: 8.000 inch diameter x 4.000 inch width (8.000" x 4.000" | 8 x 4 wheel | 8 x 4 | 203.20mm x 101.60mm)
Specifications
Wheel Dimensions
| Material | |
| Outside Diameter | 8 |
| Inside Diameter | 2.56 |
| Width Side to Side | 4 |
| Tread Profile | |
| Bore Depth | 0.91 |
| Hub Width | |
| Bore Outside Diameter | 2.8338 |
Frequently Asked Questions
Q: What is the material and specifications of the SU 9131 caster wheel?
A: The SU 9131 is a caster wheel with Poly 95A polyurethane tread. Outside diameter is 8.000 inches, tread width is 4.000 inches, bore depth is 0.91 inches, and bore outside diameter is 2.8338 inches. Inside diameter is 2.56 inches. The Poly 95A material is a medium-hardness polyurethane suitable for general warehouse use on smooth concrete floors.
Q: How does the SU 9131 caster wheel differ from the SU 9129 load wheel?
A: The SU 9131 is a caster wheel (for steering), while SU 9129 is a load wheel (for weight support and drive). The SU 9131 has a larger 8.000 inch diameter and 4.000 inch width compared to the 3.00 inch by 3.66 inch SU 9129. The SU 9131 is designed for directional control and swiveling in electric pallet trucks or material handling equipment. Do not substitute one for the other.
Q: Can I replace an SU 9131 caster wheel with a different brand that has the same dimensions?
A: Yes, if the replacement wheel has identical dimensions and bearing bore specification. Before substituting, verify: outside diameter 8.000 inches, width 4.000 inches, bore diameter 2.8338 inches, and bore depth 0.91 inches. Check that the replacement wheel mounting points align with your truck frame. Test steering responsiveness after installation to ensure tracking is straight and caster swivel is smooth.
Q: What conditions indicate the SU 9131 caster wheel needs replacement?
A: Replace the SU 9131 if you observe: visible flat spots or chunks missing from polyurethane tread, steering pulls to one side or requires excessive force to turn, caster wheel does not rotate freely (bearing damage), audible grinding or squealing during steering operation, or tread worn to less than one-half original thickness. Caster wheels typically last 1500 to 3000 operating hours. Worn casters degrade steering precision and increase operator fatigue.
Q: Is the SU 9131 bearing sealed or does it require periodic lubrication?
A: Bearing type for the SU 9131 is not specified in current documentation. Verify bearing specifications with the manufacturer or truck manual. If the bearing is sealed, lubrication is not required. If the bearing is open or shielded, lubricate with light machine oil every 250 operating hours or monthly, whichever comes first. Over-lubrication can attract dust and debris, reducing bearing life.
Q: Can I use the SU 9131 wheel on outdoor or wet floor applications?
A: The Poly 95A material is suitable for smooth, dry indoor warehouse floors. Do not use on wet, oily, or outdoor surfaces because polyurethane loses traction and grip in these conditions. For wet or outdoor applications, request a different tread compound (such as Poly 85A or natural rubber) that maintains traction when moisture is present. Using SU 9131 in wet conditions creates slip hazards and may cause loss of steering control.