SU S641

Frequently Asked Questions

Q: Is the SU S641 equivalent to the SU S641-XL?
A: Yes. The SU S641 and SU S641-XL refer to the same polyurethane load wheel with machined steel core, 4 inch diameter by 2.875 inch width, and 97A Shore durometer hardness. Part numbering varies in documentation. Always cross-reference against your equipment manual to confirm fitment.

Q: What is the load capacity per wheel for the SU S641?
A: The SU S641 is rated for 1100 lbs load capacity per wheel with straight roller bearing and 0.75 inch bore. This assumes proper axle installation and level load distribution. Exceeding capacity accelerates tread wear and causes bearing premature failure.

Q: Is the SU S641 compatible with 3/4 inch axles?
A: Yes. The SU S641 features a straight roller bearing with 0.75 inch bore, which matches standard 3/4 inch axle shafts on most pallet jacks. Do not attempt to install on different axle sizes or the wheel will bind or slide.

Q: How often should the SU S641 be replaced in a typical warehouse?
A: Typical lifespan is 2 to 4 years depending on floor conditions, load cycles, and bearing maintenance. Inspect wheels every 6 months for wear, flat spots, or cracking. Replace all four wheels as a set to maintain balanced truck operation and prevent steering problems.

Q: What causes rapid wear of the SU S641?
A: Rapid wear results from misaligned axles, worn bearings with lateral play, operation on rough or debris-laden floors, or loads exceeding specification. Failing bearings destroy new wheels within weeks. Always inspect and replace bearings if they show play before installing replacement wheels.