How do you change the big belt on the wind tunnell

there are two belts on the wind tunnel this video will show you how to repair

Take vacuum and belt to Hoover vacuum cleaner belt dealer and try smaller belts until one fits.

It depends largely on the model. Do you know the model number? you can get any hoover replacement belt here:

Replacement Hoover Vacuum Belts

If you turn the vacuum over there will be (4) screws that hold on the base cover for the roller brush. Remove the screws and the cover and you can get to the belt(s). You can get replacement belts here:

Hoover Windtunnel Belts

Did you change the belt? If the belt is worn or stretched it won't pick up well. You can get replacement belts here:

Replacement Vacuum Belts

Below I have listed a link to the manual which has instructions and a link to the V belt you need.

Windtunnel Manual

Windtunnel Replacement Belts

1. Remove the 4 screws holding the bottom plate.
2. remove roller and old belt
3. install new belt on motor spindle first and then on roller.
4. pull roller, stretching belt, set into roller cavity.
5. turn roller by hand to center belt.
6. reinstall bottom plate.& screws

I’m happy to assist further over the phone at https://www.6ya.com/expert/robert_b96ba3f038cf317c

Take off the bottom plate covering the brush roll, 4 screws. There are 2 belts, if you replace both, put the V belt on 1st, then stretch the flat belt over the motor shaft, then over the bigger pulley along side the V belt.

Take the brush belt and slip it over the pull into the groove. Then take the flat belt and hook onto the motor shaft and then pull belt over pull and push it around the entire pulley. It can be difficult but after the first time it is easy. You have to push the belt up with your thumbs so the belt will wrap all the way around

If this is new, you have a years warranty on it, take it for repair. Did you get the right belts, the numbers are 38528035 for the flat belt and 38528034 for the V belt. Also if you are catching something like a towel or area rug in the brush roll, it will knock of the belt. Is the brush roll turning freely. If not then it needs to be replaced, does it motor sound ok? If not then there is a problem with it.