In all motors fitted with ball bearings, roller bearings, or both, the bearing housings are fitted with _____ to keep the grease in and the dirt out

• A. Seals
• B. Gaskets
• C. O-rings
• D. Glands

Answer: (D)

Keeping lubrication inside the bearing housing and dirt outside relies on a packing gland fitted to the housing. The gland uses packing material around the shaft to form a seal that traps the grease within the housing while preventing dirt and moisture from entering. This is crucial for grease-lubricated ball and roller bearings to maintain lubrication and protect the bearing from contamination. While seals, gaskets, and O-rings are sealing elements in other contexts, the gland is the device specifically associated with retaining grease and blocking contaminants in bearing housings.