Hello Mate,
In short - very complex..
1st. remove the front of the dryer, then take off the plastic support for the drum, removing the circlips for the rollers, unclipping any wiring etc.. - There is no need to disconnect anything from the circuit board.
Then remove the door contact, direction sensor (x2 red cables). Unscrew everything from the rear of the machine, then remove the drum. The belt tensioners should be on the RHS rear of the machine as you look in.
Forward of that, is the plastic housing for the motor/belt spindle. Remove this, and release the spring clip holding the air circulator onto the spindle. Gently slip the belt onto the spindle, ensuring the ribbed edges face the spindle.
The belt will from the spindle, to the top left and right of the tensioner wheels. Slip the drum into place, gently easing the belt over it, then re-assemble.
Intotal, if you have peace and quiet it should take no more than 1 hour.
If you're stuck, give me a bell - 07921038988
Cheers Mate
Steve
Stephen Williamson, January 2010