Product Description
Superior SU S9139-XL-A load wheel assembly featuring 5-inch diameter Velocity HeatSink aluminum hub with 3.625-inch wide Cushothane XL polyurethane tread at 97 Shore A hardness. Engineered for Class 2 electric reach trucks with 70% weight reduction versus steel hubs, dual bearing configuration options (greaseable Z or sealed 2RS), and enhanced thermal dissipation providing 10°F cooler operation. Pre-pressed bearing assembly with guaranteed bond integrity.
Specifications
Material & Construction
| Tread Hardness | 97 Shore A durometer |
| Hub Material | Aluminum alloy construction |
| Bond Construction | Polyurethane-to-hub bond with no separation guarantee |
Mechanical Specifications
| Bearing Configuration Option 2 | Dual sealed non-greaseable bearing (2RS configuration, seals on interior and exterior faces) |
Part Numbers & Compatibility
| Manufacturer Part Number | SUS9139-XL-A (Superior Tire & Rubber Corp.) |
| Alternate Part Number Format | SU S9139-XL-A, SU 9139-XL-A |
| Compatible Equipment | Class 2 Electric Reach Trucks |
Performance Specifications
| Service Life Enhancement | Up to 2x longer wheel service life versus traditional solid steel hub wheels |
Frequently Asked Questions
Q: What is the Velocity HeatSink aluminum hub on the SU S9139-XL-A?
A: The Velocity HeatSink is a proprietary aluminum alloy hub design with thermal dissipation technology. It reduces bearing operating temperature by up to 10 degrees Fahrenheit during extended runs, extending bearing life and improving performance in high-cycle applications. The 5-inch diameter hub provides a 70 percent weight reduction versus equivalent steel hubs while maintaining full load capacity.
Q: What does 97 Shore A hardness mean, and how does it differ from standard wheels?
A: 97 Shore A hardness indicates a very firm polyurethane compound, significantly harder than standard 93A wheels. This ultra-hard Cushothane XL tread resists abrasion and cuts in severe applications, lasting longer on rough or contaminated floors. The trade-off is slightly reduced shock absorption and traction compared to softer compounds. Use 97A wheels only if your application requires extreme wear resistance.
Q: What bearing configuration options are available for the SU S9139-XL-A?
A: The SU S9139-XL-A offers dual bearing options: greaseable Z bearings (which require monthly re-greasing) or sealed 2RS bearings (which are pre-lubricated and maintenance-free). Greaseable bearings are suitable for light to moderate use and lower cost. Sealed 2RS bearings are ideal for Class 2 electric reach trucks with continuous operation or harsh environments. Verify your truck frame is equipped to accept the bearing type you select.
Q: Is the SU S9139-XL-A suitable for Class 2 electric reach trucks only?
A: The SU S9139-XL-A is engineered specifically for Class 2 electric reach trucks, which require high-performance wheels due to extended operating hours and precision steering demands. Use on other truck classes (Class 1, 3, or 4) should be verified against the trucks frame manual and bearing bore specifications. Do not assume compatibility across truck classes without official confirmation.
Q: How does the pre-pressed bearing assembly affect installation?
A: The pre-pressed bearing assembly arrives factory-mounted with guaranteed bond integrity, eliminating the need for bearing installation or pressing during replacement. This reduces installation time and risk of improper bearing seating. Remove the old wheel using a bearing puller, align the new pre-pressed assembly on the axle shaft, and secure with fasteners. Do not re-press the bearing assembly.
Q: What is the expected lifespan of the SU S9139-XL-A in high-cycle reach truck operation?
A: Under continuous Class 2 reach truck duty (12 to 16 hours daily), the 97A Cushothane XL tread combined with the HeatSink aluminum hub typically provides 4 to 6 years of service life, depending on floor surface and load profile. The sealed 2RS bearing option extends interval between maintenance checks to 2000 operating hours. Inspect wheels quarterly and monitor bearing temperature; replace if excessive heat develops or tread wear approaches 50 percent.