Single Shield Bearing Assembly for Manual Pallet Jacks

Frequently Asked Questions

Q: What does single shield design mean on the 520-03-21310 bearing assembly?
A: Single shield design features one integral steel shield on the bearing that reduces contamination from one side while allowing access for lubrication on the opposite side. This construction is typical for axle and load wheel applications where one side contacts the wheel hub and the other interfaces with the axle.

Q: Which pallet jack equipment is the 520-03-21310 bearing compatible with?
A: The 520-03-21310 is designed for manual pallet jacks from major material handling manufacturers including Crown, Toyota, Raymond, Yale, Hyster, Jungheinrich, Linde, Clark, Mitsubishi, and CAT. Confirm your equipment model and wheel bore diameter match before ordering.

Q: How does the single shield compare to double shield or sealed bearing options?
A: Single shield bearings provide moderate contamination protection while allowing easier grease maintenance than sealed bearings. Double shield or fully sealed bearings offer more protection but are sealed for life and cannot be regreased. Single shield is the preferred choice when periodic maintenance is expected and regular lubrication improves bearing life.

Q: What is the expected lifespan of the 520-03-21310 bearing under normal pallet jack usage?
A: With proper maintenance including periodic inspection and grease reapplication per your equipment manual, the bearing typically provides 3000 to 5000 hours of reliable operation. Lifespan depends on load frequency, storage environment humidity, and maintenance consistency. Dry storage extends bearing life.

Q: Are there cross-reference part numbers equivalent to the 520-03-21310?
A: The 520-03-21310 is an OEM-specific bearing assembly. Verify your original equipment bearing part number through your pallet jack documentation to confirm fitment. Bearing bore diameter, width, and outer diameter must match your load wheel or caster assembly for proper installation.