Product Description
The SU S9139-XL is a robust load wheel specifically designed for electric lift truck applications. Manufactured by Liftsplus.com, this wheel is ideal for use in outrigger or load wheel locations on electric pallet jacks and walkie forklifts.
Specifications: 3.250 inch diameter x 4.500 inch width (3.250" x 4.500" | 3.25 x 4.5 wheel | 3-1/4 x 4-1/2 | 82.55mm x 114.30mm)
• Constructed from industrial-grade polyurethane for durability
• Features a sturdy steel hub for enhanced strength
• Engineered for optimal performance in demanding environments
This load wheel is validated for use with electric lift trucks, ensuring a perfect fit for your equipment needs.
Specifications
Material & Construction
| Tread Material | Polyurethane elastomer, industrial grade |
| Hub Material | Steel, precision machined |
Part Numbers & Compatibility
| Manufacturer Part Number | SU S9139-XL |
Frequently Asked Questions
Q: Why does the SU S9139-XL use a steel hub instead of aluminum or composite?
A: The steel hub on the SU S9139-XL is precision-machined for maximum durability in high-load or continuous-duty environments. Steel provides superior impact resistance compared to aluminum and does not absorb moisture like composite. The trade-off is that steel is heavier, which increases energy consumption on battery-powered lift trucks. Choose steel hub if your truck carries loads near maximum capacity or operates in harsh warehouse conditions.
Q: Can I mix the SU S9139-XL steel hub wheel with composite hub wheels on the same truck?
A: Do not mix hub materials on the same lift truck. Mixing steel and composite hubs creates uneven weight distribution and can cause steering instability or accelerated wear on the lighter wheels. All four load wheels on a truck should use the same hub material. If you are upgrading from composite to steel, replace all wheels at the same time.
Q: What is the 3.250 by 4.500 dimension specification for the SU S9139-XL?
A: The SU S9139-XL measures 3.250 inches in diameter and 4.500 inches in width. In metric, this is 82.55mm diameter by 114.30mm width. These dimensions must match your lift truck axle and frame spacing exactly. Measure twice before ordering: a wheel that is too wide or too narrow will not fit properly and may damage the axle or frame.
Q: How does the industrial-grade polyurethane tread compare to standard polyurethane?
A: Industrial-grade polyurethane is formulated with additives that increase abrasion resistance and lifespan compared to standard polyurethane. The tread resists glazing on smooth concrete and maintains grip through higher load cycles. In heavy-duty warehouses with high-frequency pallet movement, industrial-grade tread extends wheel life by 30 to 50 percent, offsetting the higher initial cost.
Q: What maintenance schedule should I follow for the SU S9139-XL steel hub wheel?
A: Inspect the steel hub monthly for rust spots, visible cracks, or bolt looseness. If you see surface rust, clean with a wire brush and apply light machine oil to prevent corrosion. Check bolt torque every six months; steel expands and contracts with temperature changes and bolts can loosen. Monitor bearing noise by rotating the wheel by hand: if it feels gritty or rough, bearings need replacement. In harsh or outdoor environments, increase inspection frequency to every two weeks.