My hoover windtunnel + cyclonic will not pick up the dust where the brush is but the side distachment working fine

help wont pickup blows out

Check for a blockage in the hose, or a tear / hole in the hose between the "pleats"

The belt that drives the brush roll has broken. That's why it doesn't pick up and why it doesn't pull itself forwards. Check the User Manual (download from Hoover website if necessary) for information on replacing the belt. Good luck!

I have an upright Dyson Cyclonic.  Because I have dogs, I also have a Miele Pull-along.  I use the cyclonic for fine dust after picking up the hairs with the Miele.  

Much quicker in the long run.  

Otherwise I would waste a lot of time cleaning out the Dysan Cyclonic airways.  I usually use long nose pliers to get the ball out and then I use my Miele to **** the rest out of the Dysans airways!!!  

How do I change the smaller brush belt on a Hoover Windtunnel Cyclonic?

You probably need to change the belts. Here are the belts you need and the manual:

Hoover 5780-900 Belts

Manual

Your beater brush could be frozen. Meaning the bearings are shot. You'll need to replace the brush roller

clean or replace the main filter. this filter is non washable. the best way to clean is to use a paint brush or compressed air. hope this helps

Either the brush rolls are bad, ends are bad, or the gear housing/motor asm. is bad and will have to be replaced.