I took of the roller to clean off tangles. When I put it back on, the roller would not turn.

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Jeethu
Govacuum Team
https://www.govacuum.com

Depends on what you mean by 'disconnected the lower part.'

See end of the note for a link to the manual. Dyson doesn't have it directly, and a number of places either want you to download spamware, or only have a non-english copy.

1) If you took the roller all the way out, you will have had to have eased it out of the loop for the drive band, and then eased it back through after cleaning. If it's not through the loop, no drive power. The band is stiff, so it can be a bit of a challenge to pull out far enough to get the roller back through. Use a smooth dowel or other smooth sided lever to pull band out enough to feed the roller back through. (Smooth = not cutting the band)
2) If you didn't take the roller out as in (1), or did feed it back through the belt before closing it all up, then there's a couple of possibilities. A) The brush will not spin if the unit is full-upright. Put your foot on the lower assembly, pull the handle back to the 'I'm about to vacuum something' position, and try again.
B) According to the manual, this model has an 'engage brush' button. The system should start with the brush engaged, but try toggling it with the handle not up-right.

If still not spinning, turn off and unplug. Try spinning the brush by hand. If it spins freely, the clutch to engage the brush isn't engaged. If there is resistance, then it's engaged (unsure if it auto-disengages when powered off. You's want the handle tilted back when you try this).
Manual Link:
http://homeappliance.manualsonline.com/manuals/mfg/dyson/dc18.html

Good luck!

You will need to pull the roller out and clean it. I think some of the strings are tangle up at the end of this roller. (Most rollers will come apart at the end for cleaning.) Make sure that the strings are not tangle up on the belt pulley as well. I hope this will help you.

When you set the roller back in place, you probably didn't get it set in the slots properly. May be raised up slightly on one side.

Jim

Try turning the vacuum on and hold the base up so you can see if the roller is turning. Odds are it is not and what you smell is the belt burning (not literally). If the roller is not turning, look for anything that is binding it - after you have unplugged the power cord. Probably the roller head is not fully aligned with the retention lugs that hold it in place or the belt is not properly placed on the roller itself, or if it is a used model, hair and twine can get tangled in the roller and cause it to stop turning.

The rollers on each ends get tangled with hair etc...
causes resistance. Give it a good clean up.

My daughters is doing the same thing and the plastic at the ends of the brush bar melted just enough for it not to turn properly. You might want to chech that.

what probably happened is you swapped end over end when you replaced the beater brush. anyway go to thehooverstore, find your machine and you'll see an exloded diagram of your machine.