Product Description
Load Wheel
Frequently Asked Questions
Q: What is the difference between SU S377-XL and SU S377-A?
A: SU S377-XL is an extra-load or extra-large variant of the 5 x 3.75 poly wheel assembly. The -XL designation typically indicates a reinforced hub, higher-grade polyurethane compound, or larger bearing cavity for heavy-duty service. SU S377-A is the standard assembly. If your jack runs continuous duty or handles frequent full-load cycles, upgrade to SU S377-XL for longer life and better reliability.
Q: Can SU S377-XL be installed on a standard-duty pallet jack?
A: Yes, SU S377-XL can be physically installed on most standard jacks with compatible axle and bearing specifications. However, installing an over-spec wheel on an under-spec jack does not increase the jacks load capacity. It only provides insurance against bearing and wheel failure during heavy use. Conversely, do not install standard wheels on a heavy-duty jack without considering the jacks load rating. Always match wheel specification to the jacks rated duty class.
Q: What load weight is SU S377-XL rated to handle per wheel?
A: SU S377-XL poly wheels are typically rated for 3,000 to 4,500 lbs per wheel depending on bearing size and axle length. A four-wheel jack would support 12,000 to 18,000 lbs total depending on wheel and bearing configuration. Always verify the specific rating with your supplier, as load capacity varies by bearing grade and hub material. Do not assume all -XL wheels have identical ratings across manufacturers.
Q: How do I diagnose premature wear on an SU S377-XL wheel?
A: Premature wear is indicated by: (1) flat spots appearing within the first 12 months, (2) uneven wear on one side of the wheel, (3) rapid diameter loss (more than 0.125 inch in 6 months), (4) bearing noise appearing after 2 years. Common causes are misalignment (frame bent or twisted), overloading beyond the jacks nameplate rating, poor floor conditions (gravel, splintered wood), or inadequate bearing lubrication. Inspect the jack frame and axle for damage before replacing wheels.
Q: What maintenance schedule should I follow for SU S377-XL wheels?
A: Monthly: inspect wheels for cracks, flat spots, and debris. Spin each wheel by hand to check for rough bearings. Quarterly: wipe wheels clean with a damp cloth and visually inspect the polyurethane surface for UV damage (discoloration or crazing). Annually: lubricate wheel bearings if the assembly uses open bearings. Every 6-12 months: rotate wheels diagonally to even wear. Replace wheels if diameter loss exceeds 0.25 inch or visible damage appears.
Q: Can I retrofit SU S377-XL on a jack that originally came with SU S376 Cushothane wheels?
A: Retrofitting is possible if axle bore diameter and hub width are compatible. SU S377-XL is 3.75 inches wide versus 3.0 inches for SU S376. If your current hub width is 3.75 inches or greater, SU S377-XL will fit. If hub width is only 3.0 inches, the wheel will bind. Measure your axle bore OD, bore depth, and hub width before ordering. If dimensions match, SU S377-XL will improve performance over the older Cushothane wheels on most duty applications.