It should not be attempted to pump grease into a sealed bearing.

It should not be attempted to pump grease into a sealed bearing.

• A. True
• B. False
• C. Not recommended
• D. Only during maintenance

Answer: (A)

Sealed bearings are designed to be lubricated at the factory and then kept sealed to keep grease in and contaminants out. There isn’t a lubrication path or service procedure for injecting grease into these bearings, and forcing grease in can damage the seal, raise internal pressure, push lubricant past the seal, or trap contaminants. This can lead to bearing failure and often voids warranty. Because of this, the statement is correct: you should not attempt to pump grease into a sealed bearing.

Sealed bearings are designed to be lubricated at the factory and then kept sealed to keep grease in and contaminants out. There isn’t a lubrication path or service procedure for injecting grease into these bearings, and forcing grease in can damage the seal, raise internal pressure, push lubricant past the seal, or trap contaminants. This can lead to bearing failure and often voids warranty. Because of this, the statement is correct: you should not attempt to pump grease into a sealed bearing.