Or is the bearing going out?Symptoms
Tractor runs hotter than expected/normal.
Situation or Problem
Metal Coil that engages the Viscous Fan Drive can be coated with debris that acts as an insulator and prevents the fan drive from engaging. If fan drive fails to engage, tractor can run hot.
Prior to cleaning the sensor, shut the tractor off, let it cool to ambient temperature and remove the key.
Clean metal coil in center front of fan drive with spray electrical/electronic contact cleaner. This can be purchased from your local John Deere Dealer.
If cleaning the coil fails to resolve the issue, see your John Deere Dealer.