If you have removed the plastic motor housing from the hoover you will see the rubber shroud at the back of the housing which holds the motor in place. You will first need to remove the metal guard at the front of the housing (sourounding the spoke onto which you place the drive belt for the floor brush) by carefull prising it off with a small screwdriver. The guard simply clips in but be carefull not to bend it.
Once this is removed the hardest part is removing the rubber shroud which holds the motor in place by friction alone.
from the back of the motor housing look down the housing and you will see the rubber housing pushes up against the plastic casing with an outer ring of rubber (connected by rubber forks to the main body of the shroud). very carefull use a non serated blunt knife (such as a butter knife) and slip this between the rubber and the plastic and begon to gently work the shroud out whilst working in circular motion all around the housing. This is fairly hard work but is the only way I have found to remove the motor. The motor finally disconnects from the housing by removing to push together electrical connectors.
mike
January 2005