Beko DRCS68W Condenser Tumble Dryer fitting a pulley belt?

My Beko DRCS68W Condenser Tumble Dryers belt has snapped I have a new belt on order but is there a particular way off fitting it ie does the motor need to be loosened for the belt to fit similar to a cars alternator or is it simply stretched onto the motor. I dont want to force it when there might be something simple like loosening a retaining bolt to slacken the motor. anyone changed one