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That is probably the belt. Open up the bottom screws and take a look. The cat or dog hair usually gets stuck in the ends of the rollers and stops the belt from effectively pushing the roller. You may find that the belt is still on the drive and the roller. If you do just clean out the roller.
(The below worked with my 9.6v version - I assume the others in the pivot range will be similar). If you open the lid (where the dust collects) you can twist the inner plastic filter about 30 degrees to unlock it. Then, with a bit of "fiddling" with the fold out part (press the unlock button and rotate the suction part as if you were going to use the unit) then, the plastic internal part and the whole suction bit will come off the motor part. Do this slowly as the inner filter will be full of dust and muck. You can then take the filter out, tap it clean in the bin and then wash and dry it with washing up liquid (gently) and allow to fully dry before putting it all back together again.
Ours began making a hideous grinding racket and then quit altogether. Upon disassembly, I found a plastic guard protecting the fan that had warped and was preventing the motor from turning at all. Your problem may be related to the same plastic guard. I removed mine and now all is well...I think. If only I could find a replacement for this little guard. Every online parts distributor I've seen will only go as far as selling filters and prefilters.
http://geeksquad.fixya.com/ThreadView.aspx?prdid=0&thid=859375 Generic problem for all Vacuums DUST BUSTER 7.2 POWER LASTS FOR Posted by bettedxx on July 31, 2008 DUST BUSTER 7.2 -- POWER LASTS FOR UNDER ONE MINUTE?? Hello, I would advise you to ALWAYS to FIRST UNPLUG YOUR VACUUM before beginning any service procedure. The problem that people have with dustbusters is that when they 1st get them they need to say train the dustbusters to extend the battery life, the process is simple – when you 1st buy the dustbuster then you charge it up the 1st time and then you turn it on and drain the battery down to nothing, and then recharge the dustbusters again, and by doing that you have a larger battery life and it will run longer – but dustbuster and vacuums like that do not tell you and when people buy the item they just turn it on for a minute or two and then the battery does not get a “memory” as per how long it should run. By doing this the dustbuster will last and run longer and will have fewer problems. So if you need further assistance, please feel free to contact your local vacuum cleaner dealer in your area or in the yellow pages, or contact the factory phone number or website to further assist you with your questions. Thanks, Don the Vac Man Go Ahead. Use Us.