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Check for clogs starting with the air passageway at the bottom.
A piece of TV cable or similar works well as you have to snake
it in. Check all hoses, Are the filters clean? If you can, remove
the brush bar and belt then turn vacuum on. If the vacuum is
no longer making a loud noise the side bearings on the brush
bar are the problem...replace the bar or spray a bit of WD40-
if you do that wipe well before you vacuum. Finally....if the
vacuum was still loud with the brush bar off...you have a motor
problem and that could be expensive.
Check for clogs starting with the air passageway at the bottom....
a piece of TV cable is great for clearing clogs there....check all
hoses...check for dirty filters. If you find no clogs remove the
brush bar and belt and start the vacuum...if the vacuum is no
longer noisy the problem is the bearings at each end of the brush
bar..... WD 40 may fix or you will have to replace. If after all this
the noise persists the the problem is in the motor. (If you use WD 40
make sure it is dry before you vacuum carpet)
It's clogged! Many so-called "environmentally friendly" vacuum cleaners have multiple stage filters; the usual configuration is a standard filter followed by a HEPA filter or equivalent. Standard filters can be a paper bag or a bagless, removable container. From time to time, the secondary filter will get clogged, so it doesn't matter whether you change the bag or empty the container, performance will not improve. If you have access to compressed air, try removing the secondary filter and blowing it clean with a high pressure air nozzle. If that doesn't work, check the hose to make sure it's clear. If you are using a rug beater attachment, make sure it has not clogged at its inlet.
You could have a clogged air filter and vacuum is not getting air to motor. You could have hair and string buildup on ends of roller brush. You can put a vaccum hose over a broom handle to clean it out. Also, check the little elbow of the hose at the bottom f vacuum where it bends.
First, check all of the ports, there are various covers you can take off to see if there is a clog, also check the hose for a clog. Make sure all filters are clean out. The worse case would be a motor problem.