Bearing Assembly

Frequently Asked Questions

Q: What does ZZ mean on the NT6306ZZ bearing?
A: ZZ indicates the NT6306ZZ has metal shields (noncontact seals) pressed into grooves on both sides. These shields are permanently sealed and protect the bearing from contamination better than contact seals, though they reduce greasing accessibility.

Q: Which pallet jack models accept the NT6306ZZ bearing?
A: The NT6306ZZ bearing assembly fits manual pallet jacks from Crown, Toyota, Raymond, Yale, Hyster, and similar manufacturers designed for ZZ-sealed bearings. Cross-reference your equipment part number to confirm compatibility before ordering.

Q: Is the NT6306ZZ pre-lubricated or does it require greasing?
A: The NT6306ZZ comes pre-lubricated with grease that lasts through normal use. Because the sealed design prevents easy re-greasing, when performance degrades, the entire bearing must be replaced rather than serviced.

Q: How long does the NT6306ZZ bearing typically last?
A: Under normal conditions, the NT6306ZZ provides 2-5 years of service depending on load, usage frequency, and floor type. Harsh environments, excessive loads, or contamination will shorten lifespan. Replace if grinding noise or resistance to rotation develops.

Q: Can the NT6306ZZ be substituted for the NT6306LL?
A: While both bearings have the same core dimensions, they are not always directly interchangeable. Verify that your equipment was originally designed for ZZ seals before substituting. Contact us if you are uncertain which type your equipment requires.