GW 684-A

Frequently Asked Questions

Q: How does the machined steel core in GW 684-A compare to cast iron cores?
A: Machined steel cores provide superior strength, precision, and thermal management compared to cast iron. Steel is denser and more fatigue-resistant, making it better suited for heavy-duty continuous operation. Machining ensures exact dimensional tolerances and concentricity, resulting in smoother rotation and longer bearing life. Steel resists corrosion better than cast iron in humid warehouse environments. The trade-off is that steel cores are slightly heavier; verify your truck is rated for the added weight.

Q: What does non-marking polyurethane mean, and does it affect performance?
A: Non-marking polyurethane does not leave black or brown scuff marks on warehouse floors, which is critical in food processing, pharmaceutical, or sensitive manufacturing environments. Non-marking formulations are typically slightly softer than standard polyurethane, providing enhanced grip on polished floors. Performance characteristics remain excellent for indoor warehouse duty. Non-marking wheels cost more than standard wheels. Verify your facility requires non-marking wheels before purchasing, as they are not necessary for general warehouse use.

Q: What is the bearing ID in both metric and inch measurements?
A: The bearing ID is 30.000 mm, which equals 1.181 inches. Your truck axle must be exactly 30 mm in diameter for correct fitment. Mismatched bore sizes will cause excessive play, wobble, and rapid bearing wear. If your truck has a different axle diameter, GW 684-A is not compatible. Verify axle diameter before ordering to avoid installation problems and potential safety issues.

Q: What does 95A hardness mean for the tread profile?
A: 95A Shore durometer indicates the polyurethane is medium-firm and optimized for warehouse environments. This hardness delivers excellent wear resistance for high-mileage applications while maintaining low rolling resistance and thermal stability. The tread will not harden in cool environments or soften excessively in warm conditions. Heat generation remains minimal during extended operation. This rating is ideal for indoor continuous-duty applications.

Q: How do I verify the wheel is installed correctly on the axle?
A: After installation, spin the wheel by hand with moderate force; it should rotate freely and smoothly with no grinding or squeaking. The wheel should not wobble or deflect side-to-side. Verify the axle fastener is torqued to manufacturer specifications; use a torque wrench for accuracy. Test the truck at low speed in an empty area, listening for noise and watching for uneven wear patterns. If the wheel makes grinding noise or exhibits wobble, stop immediately and verify bore alignment.

Q: What is the expected service life of GW 684-A in continuous duty?
A: GW 684-A is designed for 24 to 36 months of service life under standard warehouse duty and 120 cycles per hour. Continuous operation in temperatures above 90 degrees Fahrenheit or on rough concrete may reduce service life to 18 to 24 months. Wheels used on polished floors or at lower cycle rates may achieve 36 to 42 months. Replace wheels when tread depth falls below 25 percent of original thickness or when bearing damage is confirmed. Do not attempt to repair or re-tread wheels; replacement is the only option.