The clock motor in an Intermatic T104 Timer will occasionally fail. If the yellow wheel stops turning but the manual switch still functions correctly, It may be due to one of two failures, the timer motor or the timer mechanism. The following steps show you how to replace the motor, WG1573-10D. Note, this motor is for a T104 220V timer. If you have a 110V timer, T101, use motor WG1570-10D.