Changing the brush

Take off the brush cover. Gently grip the sock with your fingers or a pair of pliers.
Pull the sock out in the direction opposite to the rotation of the roller brush.
If the sock is tightly wedged, you may need to wiggle it back and forth while pulling..
After removal, check for damage. If the brush bristles are bent or worn, consider replacing the roller brush.
Reassemble and Test following the manual instructions.

Here is the manual : ] HOOVER

May be a burned out collector of the armaturebetween the brush holder and armature ballbearings are maybe poor change the motor , and replace allways 2 brushes if its possible because 1 fieldcoil stator of the motor should have a problem if 1 brush is shorter than the other brush there is a disbalans with 1 long and a short brush , in the early years 50 60 or the more expensive vaccuums like Kirby 600 W motors
it is useful to change brushes buit in 60% of the cases you lost the brushes again in 1 month .

Hi! The brush-roll feature needs to be engaged for the belt to tighten, so when checking the belt it will appear to be loose. Be sure you have replaced both belts on the vacuum with genuine Hoover parts. This unit takes belt 38528034 and 38528035. Also, make sure the vacuum is on carpet mode. Follow the link to view the instruction manual which provides instructions and illustrations on changing the belt to be sure it is assembled properly.
http://hoover.com/file/509/

Hope this helps!

Hi! It sounds like you have a broken or stretched belt. The belt controls the brush roll. If you are using the vacuum on carpet, you need the brushes to spin to agitate the carpet fibers. Below are step-by-step instructions on how to replace your belt. I have also included a link to the instruction manual if needed.

1. Lay cleaner flat and flip to expose nozzle base. To remove nozzle guard, use Phillips screwdriver to remove the screws.
2. Lift and remove brush roll and dispose of old belt if you see one.
3. Slide belt (style 19) onto motor shaft.
4. Place new belt on area of brush roll without bristles.
5. With new belt in place, pull and slide brush roll into nozzle making sure that the brush roll end caps are in the correct orientation.
6. Replace all screws to replace nozzle guard.

http://dirtdevil.com/file/898/

Hope this was helpful!

You need to replace the belt. Here is the belt you need and a manual you can view which has instructions:

Dyson DC17 Belt and Manual

That means that you need to replace the belt that turns the roller brush. They naturally stretch and wear and you should replace this belt yearly. Here is the belt you need and the manual which has instructions on how to change it:

Dyson DC07 Belt and Manual

Remove the cover that covers the roller brush, (four screws) and remove
the roller brush and replace belt, it goes between the motor shaft and the roller brush. Replace the cover and that should do it.

Tom

should be just 2 screws by the beater brush, bottom front of the machine, pop them out and remove brush to remove hairs etc. put new belt in .

I have a whispertone vacuum, different model #, but maybe instructions will be the same. Turns out I didn't need a new belt, just clean out the crud and reset overload protector. The instructions in the manual tell you to remove the light cover and bulb first. To do this, press in and lift both sides. Push in and turn bulb counterclockwise to remove. (you need to do this because the next step involves turning the unit over). This takes you to
Step 2. Unscrew the cover screws ( on either side of bulb).
Step 3. Turn unit over. To remove cover, insert screwdriver at cover tabs on both sides and twist to release tabs.
Step. 4 Turn unit right side up. Press handle release pedal and lower the swivel. Tilt cover forward from back until front snaps free.
Step 5. Carefully insert and twist screwdriver at each brush support to free brush from base.
Step 6. Remove worn belt.
Step 7. Slide brush supports off to check and clean brush support areas.

To replace belt: slide washers and brush supports onto brush assembly.
Install new belt over motor drive, then over brush sprocket.
Snap brush supports into place on base. Be sure brush supports are not upside down.
Line up front of cover and base. Rest cover on front edge of base. Tilt cover to back. Press cover firmly until side tabs snap into place. Replace cover screws, light bulb and light cover.