Product Description
BEARING, 20MM, RUBBER SHIELD
Frequently Asked Questions
Q: What are the specifications for the WR 539 bearing?
A: The WR 539 is a 20mm bore deep groove ball bearing with a rubber shield on one side. This configuration provides basic contamination protection while allowing lubrication access. The bearing is commonly used in manual pallet jacks and hand trucks from multiple OEM manufacturers.
Q: Which manual pallet jack models use the WR 539 bearing?
A: The WR 539 fits various manual pallet jack models from Crown, Toyota, Raymond, Yale, and other manufacturers that use 20mm load wheel and steering wheel assemblies. Verify your equipment model and wheel bore diameter match 20mm before ordering to ensure proper fitment.
Q: Does the rubber shield on this bearing require maintenance?
A: The rubber shield is a dust and contaminant barrier but does not seal out all moisture. Inspect the bearing periodically for rust or corrosion, especially in wet or cold storage environments. If the shield becomes damaged or worn, replacement is recommended to protect the ball races.
Q: What is the typical lifespan of the WR 539 bearing in service?
A: Bearing lifespan depends on load, speed, and maintenance. Under normal manual pallet jack operation with regular lubrication, the WR 539 typically lasts 2 to 5 years. Excessive loads, high-speed operation, or contaminated environments will reduce lifespan significantly.
Q: Are there equivalent or cross-reference bearings for the WR 539?
A: The WR 539 is a standard 20mm bore bearing. OEM equivalents exist from bearing manufacturers like SKF, FAG, and Timken with the same bore and outer diameter specifications. Confirm outer diameter and width dimensions match your application before substituting.
Q: Can I use the WR 539 in sealed or shielded applications?
A: The rubber shield on the WR 539 provides one-sided protection only. It is not a full sealed bearing. For high-contamination or wet environments, you may need to evaluate sealed bearing options or upgrade to a fully shielded or sealed version if available for your equipment.