Just fixed new belt my Zanussi TC481W and had problem exactly as you describe. Found that the black flywheel is mounted onto the motor and that the whole unit is tensioned by a spring underneath. If you rotate the motor (and the flywheel ) you can fit the drive belt around the flywheel and the grooved motor shaft such that this pulls against the spring and gives you the tension required to drive the drum. Viewed from the rear working from left to right, the belt comes off the drum, clockwise around the flywheel, anticlockwise around the flywheel then back onto the drum.
Nick, September 2007
