The shaft coupling bearing is an integral part of your electric fan. It keeps the motor from pushing and pulling on the rotor shaft, leading to premature wear and tear. If you hear a grinding or popping sound when you turn your fan on, it might mean that your electric motor is trying to move through a clogged or damaged shaft coupling bearing. In other words: You should clean it as soon as possible!

Checking The Condition Of The Shaft Coupling

If you have an EF shaft coupling bearing (ลูกปืนจับยึดปลายเพลา EF, which is the term in Thai), you can check its condition by removing it from its position and holding it up to a light source. The shaft coupling bearings should spin freely when they are clean and undamaged. If there is any sign of wear or damage, your shaft coupling bearing may need to be replaced as soon as possible to prevent further damage.

Cleaning The Shaft Coupling

  • You will need to remove the bearing first.
  • Once you have removed the bearing, clean it with a solvent and a rag.
  • Clean dirt and debris out of the retaining ring grooves.
  • If there is rust on your coupling shaft bearings, use a wire brush or sandpaper to remove as much rust as possible before cleaning them with solvent and a rag.
  • Check for wear by pressing down on each side of your new bearing using some pressure.
  • If it sinks in more than about 0.25 mm (0.01 inch), you’ll need to replace it with another one.

Greasing The Shaft Coupling Bearing

Greasing the shaft coupling bearing is not required, but it can be added if the bearing is noisy when being moved about. The grease should be added to both sides of the shaft coupling bearing. It should be applied to one side at a time with a butter knife or other suitable tool. If you are greasing it before installation, ensure that you spread some grease on each end of the shaft coupling bearing before installing it into your motor.

If you do not have any lubrication source on hand, go ahead and use some WD40 spray or wait for things to cool down before installing them together inside your motor’s housing unit.


Once you’ve cleaned your shaft coupling bearing and greased it, could you put it back on the truck? You can now safely drive your vehicle without worrying about any more problems with your bearings!