The brushroll on my sisters DC14 ( non-clutched ) was not working. I offered to replace the belt. When I removed the footplate I could see the belt was not broken. I removed the brushroll and the ends were stuck ridged, so I took them off, removed a lot of dirt, then sprayed the metal rod with a little WD40. I replaced the brushroll and put a new belt on anyway as the old one was very stretched. I turned it over, plugged it in tilted it on my knee and turned it on. It worked great, the brushroll was turning, but after a minute, black smoke, which didn't smell of burning was coming out the bottom at the area of the belt!!!
I turned it of and when I removed the footplate the belt felt very hot. Is this normal? Any help or advice would be gratefully received, thanks.