Turn the deck over so the underside is facing you
Remove the circlip on the overarm shaft (arrowed)
Unsolder the wires from the pick up arm which will be either a tag strip or phono sockets.
Remove the green motor wire from the connector block if you havn't already done so.
Remove the circlips around the motor body and remove the motor. I've never had a problem with these motors. So unlike the AC53 fitted to the conquest and earlier decks, I've not stripped one to lubricate the bearings.