Image is for illustration purposes only. Actual part may vary.

663

BEARING 663

This is a tapered roller bearing cone (the inner ring and roller assembly) used in heavy-duty truck wheel hubs and differentials. It works as part of a matched set with a separate outer cup to handle both radial and thrust loads. A replacement is typically needed when you hear rumbling or grinding from the wheel end, feel excessive play after adjustment, or discover scoring, pitting, or heat discoloration during a brake or hub service.