How to Grease a Fan Bearing

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All motor drive fans employ at least two bearings---one at each end of the motor. The bearing reduces friction, helps align the fan shaft in the motor and quiets the fan. While many residential and appliance grade fans are sealed and require no grease, larger fans incorporate serviceable bearings. These bearings require periodic greasing to help reduce bearing wear and extend the life of the fan.

Things You'll Need

  • Grease gun
  • Lint-free rag
  • Operate the fan until the motor, and therefore the bearings, become warm. Warming the fan motor softens the grease within the bearings and will allow the motor to accept new grease more readily.

  • Turn off the fan, and unplug the cord from the wall outlet.

  • Clean the grease fittings with a soft, lint-free rag. Pump or debris on the grease fitting into the bearing with the new grease if the fitting is not clean.

  • Plug a standard grease gun's coupling onto each fitting. Pump three to four shots of grease into each fitting.

  • Disconnect the grease coupling, and wipe away any excess grease using the lint-free rag.

  • Plug the fan into the wall outlet, and turn it on for five to 10 minutes to disperse the grease within the bearings.

Tips & Warnings

  • Use lithium grease to service fan bearings unless the operators manual recommends a specific grease type.

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References

  • "Lubrication Fundamentals"; D. M. Pirro, A. A. Wessol and J. George Wills; 2001
  • Photo Credit Nicholas Eveleigh/Photodisc/Getty Images
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