Electric clutch/brakes last just so long. Usually one of the bearings uses up its grease and overheats. One bearing turns all the time that the engine is running, the pulley bearing turns unless the clutch is on.
Replacing these bearings is not recommended due to their precise positioning and the high probability of damaging the clutch parts when both removing and installing the bearings.
These clutches when mounted on a vertical shaft engine are in a nasty environment being under the machine.
As reynoldston has mentioned, an over greasing situation would destroy the clutch.
Before installing a new clutch, cleaning up the crankshaft where the clutch mounts and applying a very slight amount of anti-seize compound to the crankshaft before installing the clutch is recommended, applying the correct torque to the clutch mounting bolt is highly recommended, do not apply anti-seize to this bolt, the torque spec is for a dry torque.
I remove the screen above the flywheel and hold the flywheel nut with a socket and a breaker bar as I torque the clutch bolt to the correct dry torque spec.
Generally easier to do with one side of the machine jacked up and a rear wheel removed.