Product Description
Load Wheel Assembly
Frequently Asked Questions
Q: Is the SU 635-A assembly compatible with trucks that previously had SU 631-EZ-A?
A: No. The SU 635-A is a 6-inch assembly with a 3/4-inch hub bore. The SU 631-EZ-A is 5-inch with 5/8-inch bore. You cannot substitute one for the other. The SU 635-A is for Yale and Hyster stacking trucks and reach trucks. Installing it on a pallet jack axle shaft will damage both the wheel and the axle.
Q: What is the equivalent part number for the SU 635-A?
A: The SU 635-A is equivalent to Yale part 580044661 and Hyster part 1326357. These are all 6-inch diameter assemblies rated for 4000 pounds per wheel. Cross-reference your truck serial number to confirm the correct bore diameter and height before ordering.
Q: How is the SU 635-A installed on a truck axle?
A: Remove the existing cotter pin and retaining nut from the 3/4-inch axle shaft. Slide the old assembly off. Clean the shaft with a dry cloth. Slide the SU 635-A onto the shaft and hand-tighten the retaining nut. Turn the nut an additional 1/8 turn. Install a new cotter pin and bend both legs. Grease through the zerk fitting until new grease is visible.
Q: What load capacity does the SU 635-A provide?
A: The SU 635-A supports 4000 pounds per wheel on dual-wheel configurations and 2500 pounds on single wheels. It is rated for 60-percent duty cycle at full load. Maximum continuous load is 3500 pounds. Operating temperature range is 14 to 140 degrees Fahrenheit. Do not expose to temperatures below -10 degrees Fahrenheit.
Q: What is the maintenance schedule for the SU 635-A?
A: Grease every 40 operating hours or monthly. Inject grease through the zerk fitting until fresh grease appears around the axle seal. Inspect the tire every 500 hours for flat spots or chunks missing. Replace the assembly when the tire is worn below 1 inch depth. Expected lifespan is 20 to 28 months with proper maintenance.