This is how it works on my Kenmore canister vac. the top of the vacuum head where the light is pops off, you should see about three little grooves on the side of it. You pop that off and there should be two srews you must remove them, then flip the head over on either side there should be a little arrow, use a screw driver to pop out each side and possibly the front by the bristles. The top should them detach from the bottom, and voila use should then be able to accsess the belt. Then when you are done put it all back together and remember to put the screw back in.
Errin, December 2006