Dryer drum belt, length 88.75" x width 1/4". If the drum does not turn, but you can hear the motor running then there is a good chance the belt has broken.
Dryer thermal limiter (or thermal fuse). May be located on the blower housing or element. If the dryer overheats, the thermal fuse blows to cut off power to the dryer. If the thermal fuse has blown, the dryer won't start. The thermal fuse cannot be reset--if the fuse has blown, it must be replaced
Washer drive belt. If this belt is broken, the washer will not spin or agitate.
Timer assembly, washer
Dryer drum drive motor with pulley for belt
Dryer push to start switch
Door switch, 3 terminal