I have tried 3 new belts and it breaks as soon as

YOUR BRUSH ROLLER IS FROZE UP,TAKE THE BRUSH ROLLER OUT AND SEE IF THE ENDS TURN,IF NOT YOU SHOULD BE ABLE TO TAKE THE ENDS OFF AND REMOVE WHATEVER IS KEEPING IT FROM TURNING OTHERWISE GET A NEW BRUSH ROLLER.DID YOU CLEAN THE MOTOR SHAFT OF THE OLD BURNT RUBBER FROM THE OLD BELTS.IF YOU DON'T CLEAN THAT THEN THE NEW BELTS WON'T LAS AS LONG AS THEY SHOULD

The featherlight, and probably others by Dirt Devil are some of the worst designs I've ever encountered! The so called 'automatic' height adjustment consists of front wheels on a swivel mechanism that is forced up or down according to how high or low you are holding the vacuum. So, if you are holding the vacuum at a height for normal operation by it's very design it will be forced into the carpet too deeply which the belt cannot handle, thus breaking it in record time. The only way I was able to rectify this was by shoving a piece of cardboard under the wheels at an ideal height that would still pick up dirt but not bear down onto to the carpet! In conclusion, don't buy this piece of **** unless someone holds a gun to your head!!!!!!

did you check to see if the roller moves freely when the belt is off