SU 231

Frequently Asked Questions

Q: What is the SU 231 wheel and what is it designed for?
A: The SU 231 is a load wheel for electric lift truck applications, not a drive wheel. It is a 3.00 inch nominal diameter wheel with 3.66 inch width constructed from high-density molded nylon. Load wheels support the carriage and load on the sides and rear of lift trucks, not the front drive wheels.

Q: Does the SU 231 have sealed bearings?
A: Yes, the SU 231 is equipped with 20 millimeter sealed precision ball bearings that reduce friction and maintenance. Sealed bearings do not require lubrication and resist contamination from dust and moisture. This design extends wheel life and reduces operating noise compared to open bearing wheels.

Q: Is the SU 231 compatible with my lift truck that uses standard axle shaft specifications?
A: The SU 231 is designed for compatibility with lift trucks using standard axle shaft specifications, meaning the 20 millimeter bearing bore matches common truck designs. However, do not assume compatibility without verification. Measure your existing load wheel bearing bore diameter and width, and compare to the SU 231 specifications. Some trucks use metric, others use inch sizes; confirm before ordering.

Q: How do I diagnose load wheel problems on my lift truck?
A: Symptoms of failing load wheels include side-to-side rocking of the carriage during lift, grinding or squeaking noises when moving the truck, or if the truck leans when parked loaded. Jack up the truck and spin each load wheel by hand. If it does not spin freely or makes noise, the bearing is failed and the wheel must be replaced. Inspect the nylon for cracks or chunks missing, which also require replacement.

Q: Can the SU 231 load wheel be used in cold storage or outdoor environments?
A: The SU 231 nylon wheel can operate down to 0 degrees Fahrenheit for short periods, though nylon becomes slightly more brittle in extreme cold. Nylon absorbs moisture and can expand or shrink with humidity changes, affecting fit on the axle. For permanent cold storage use below 20 degrees, contact the manufacturer for alternative materials. Do not use the SU 231 outdoors or on rough surfaces, as nylon degrades quickly from UV exposure and abrasion.

Q: What is the maintenance procedure and lifespan for the SU 231?
A: The SU 231 requires minimal maintenance because of sealed bearings. Inspect load wheels every 50 hours of operation for cracks, worn flat spots, or bearing play. Do not apply grease or oil to sealed bearings as this damages the seals. Replace the SU 231 when the bearing spins with excessive play, the nylon cracks deeper than 0.25 inches, or if chunks are missing. Under normal warehouse duty, expect 3 to 5 years of service before replacement.