Product Description
5 X 3.75 Poly Load Wheel
Frequently Asked Questions
Q: How does the SU S377 5 x 3.75 poly wheel compare to the SU S376 Cushothane wheel?
A: SU S377 is a 5 inch diameter x 3.75 inch width poly wheel, while SU S376 is 5 x 3 Cushothane. The SU S377 is 0.75 inches wider and made from polyurethane instead of Cushothane. Poly wheels offer better wear resistance and durability on rough floors but may be less forgiving on fine floors. The wider width distributes load across a larger area, making SU S377 better for heavy loads and long duty cycles.
Q: Is SU S377 compatible with jacks originally fitted with 5 x 3 wheels?
A: SU S377 cannot be directly substituted for 5 x 3 wheels unless the axle spacing (hub width) is at least 3.75 inches. Installing a wider wheel on narrow axle spacing will bind the wheel, overheat the bearing, and damage the wheel hub. Always measure your current hub width. If it is only 3.0 inches, you must use SU S376 or equivalent 5 x 3 width wheels.
Q: What are the bore specifications for SU S377?
A: Bore specifications for SU S377 vary by hub design. Typical specifications include a 2.625 inch inside diameter and bore depths ranging from 0.739 to 0.875 inch depending on the hub style. Confirm exact bore OD, bore depth, and hub width before installing. Using SU S377 on an axle with mismatched bore dimensions will cause immediate play and bearing damage.
Q: How do I determine if SU S377 is the correct wheel for my jack?
A: Measure and record: (1) current wheel diameter (should be 5.0 inches), (2) current wheel width side-to-side (if 3.75 inches or wider, SU S377 may fit), (3) axle bore diameter and depth, (4) hub width (distance between the two hubs on the axle), (5) jack nameplate load rating. Compare these measurements to SU S377 specifications. Contact the wheel supplier with all measurements if unsure.
Q: What is the typical lifespan of an SU S377 poly wheel?
A: SU S377 poly wheels typically last 5-8 years under normal to heavy-duty use, compared to 3-5 years for Cushothane wheels. Poly is more resistant to UV, temperature swings, and abrasive floors. Lifespan depends on load frequency, floor surface (concrete vs. rough), and storage conditions. Inspect quarterly for flat spots, cracks, and bearing noise. Replace when diameter loss exceeds 0.25 inch or cracks propagate.
Q: Can SU S377 wheels be repaired or only replaced?
A: SU S377 poly wheels cannot be economically repaired. Machining worn wheels is not recommended because poly material is softer than metal and may deform under the cutting tool. Wheel damage (flat spots, cracks, chunks missing) requires full wheel replacement. The only preventive maintenance is keeping wheels clean, checking bearing grease, and storing the jack indoors to prevent UV and thermal degradation.