How do you mean, that you have to rotate drum. Is that just to get it started or what. Most units have an interlock switch, to stop it rotating when door is open, for safety. IF you just need to turn it to get it going, could be motor start capacitor. IF it does not self rotate, could be belt or motor or controler.
SD
September 2012
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix tumble dryers.