Product Description
Load Wheel
Frequently Asked Questions
Q: What is the difference between the SU 635 and SU 631-XL wheels?
A: The SU 635 is a 6-inch wheel with 2.5-inch tire depth and 4000-pound per-wheel capacity. The SU 631-XL is a 5-inch wheel with 2-inch tire and 3500-pound capacity. The SU 635 is for heavier-duty Yale stacking trucks and reach trucks. Do not substitute one for the other; they require different hub bores.
Q: What hub bore diameter does the SU 635 require?
A: The SU 635 has a 3/4-inch hub bore. Do not attempt to install it on a 5/8-inch axle shaft. Verify your truck model before ordering. Yale and Hyster stacking trucks (models with part number 1326356) use the 3/4-inch bore. Pallet jacks typically use 5/8-inch bore wheels instead.
Q: Can the SU 635 wheel be used as a replacement on a truck that previously had a different wheel?
A: Only if the hub bore matches. If you are upgrading from a 5-inch wheel to the SU 635, you will need to replace the axle shaft hub or adapt the bore. Upgrading the wheel alone without matching the hub will cause wobbling and bearing failure. Consult your truck manual or contact the manufacturer for hub compatibility.
Q: What is the load capacity and operating temperature range for the SU 635?
A: The SU 635 supports 4000 pounds per wheel on dual-wheel configurations and 2500 pounds on single wheels. It operates from 14 to 140 degrees Fahrenheit. The 6-inch diameter reduces rolling resistance, lowering battery drain by 8 percent compared to 5-inch wheels. Maximum sustained load is 3500 pounds at 60 percent duty cycle.
Q: How long does the SU 635 wheel last in typical use?
A: The SU 635 tire lasts 20 to 28 months under normal warehouse loads. The larger diameter spreads wear over a larger surface, extending lifespan 15 percent longer than 5-inch wheels. Replace when worn below 1 inch tire depth. Inspect for flat spots or cracks every 500 operating hours.