The Tools you need are a medium sized Phillips head screwdriver, and a T26 size Torxkey (like an allen key but with star type ends). And the tool to remove the mower blade.
*** Make sure mains cable is not attatched.***
Remove the Grass box lid by carefully easing away from one of the hinges . Remove the grass box.
Remove the motor cover by removing the THREE phillips head screws - two inside the grass box area and one on the front of the machine - just above the bottom lip.
Lift off the motor lidand the foam filter. Clean away any old grass.
Carefully pull the live and neutral connections off the motor - take care not to bend the spade connections.
Turn the mower over and remove the blade and fan etc.
Remove the FIVE torx screws securing the drive plate (and motor) to the mower body).
Lift away the drive plate and motor. SLACKEN the FOUR Torx screws securing the motor to the drive plate (They are in slots that facilitate tensioning the drive belt. Remove the old drive belt and fit your new belt ensuring it sits parrallel to the drive plate. Tension the belt by sliding the motor along and then tightening the torx screws securing the motor to the drive plate.
Refit the motor and drive plate to the mower body- with 5 torx screws.
Reconnect the motor wires live and neutral.
lay the cable in its proper track - from motor to rear of mower.
Replace the Motor lid with its three phillips head screws.
Replace the mower fan and blade underneath.
Replace the grassbox and grassbox lid .......
Hope this helps.
Geoff, April 2007