Product Description
Load Wheel Assembly
Frequently Asked Questions
Q: What is included in the SU 631-A wheel assembly?
A: SU 631-A is a complete wheel assembly that includes the elastomer or polyurethane wheel bonded to a steel hub, bearings pre-installed, and hardware ready for bolt-on installation. The assembly is tested and balanced at the factory. You do not need to install bearings, align the wheel, or perform any pre-installation machining. Simply mount it to your truck and verify bolts are torqued correctly after five hours of operation.
Q: Do I need to remove the old wheel assembly or just the wheel to install SU 631-A?
A: You must remove the entire old assembly (wheel, hub, bearings, and fasteners). The SU 631-A assembly includes its own hub and bearings, so the old bearing housing cannot be reused. Unbolt the assembly from the axle, slide it off the axle spindle, and slide the new SU 631-A assembly onto the spindle. Align the bolt holes and torque fasteners to the specification in your truck manual. Do not attempt to reuse bearings or hubs from the old wheel.
Q: Can SU 631-A be used to replace a damaged SU 629-XL-A wheel?
A: Only if both wheels have identical bore diameters, width, outside diameter, and bolt pattern. If sizes differ, installing SU 631-A on a truck designed for SU 629-XL-A will cause steering misalignment, uneven load distribution, and bearing overload. Always verify dimensions and bolt pattern before substituting wheel assemblies. When in doubt, order the exact replacement part number for your truck model. Cross-referencing requires dimensional drawings.
Q: What is the bearing life expectancy for SU 631-A under typical warehouse conditions?
A: Bearings in SU 631-A typically last 24 to 36 months under normal warehouse operation (8 to 12 hours daily on clean concrete floors). Bearing life depends on load, floor conditions, and maintenance. Wet floors, oil contamination, and prolonged high-speed operation shorten bearing life. Check bearing play quarterly by grabbing the wheel and shaking it. If you feel play or hear grinding noise, replace the assembly. Do not attempt field bearing replacement; replace the entire SU 631-A assembly.
Q: Should I replace all four wheels at once or only the damaged one?
A: Replace all four wheels (or six, depending on truck configuration) at the same time. Wheels wear unevenly, and mixing new and worn wheels causes steering drift and uneven load distribution. If you must replace a damaged wheel immediately, install a temporary wheel of identical size and wear condition, then schedule replacement of all four wheels within two weeks. Delaying full replacement increases risk of misalignment and accelerated bearing wear.