Checking for obstructions; changing a drive belt
Caution: Unplug the vacuum cleaner before doing any work on it.
If a vacuum cleaner fails to work properly, first check that the dust bag isn’t full. When replacing the bag, check the condition of the filter and clean it, if necessary. Replace the filter at least once a year.
In a canister vacuum cleaner, check for obstructions in the hose and attachments. Plug the hose into the exhaust port, if there is one; run the other end into a paper bag and turn on the motor. Or try pushing a broom handle through the hose. If there are no obstructions and air flow is weak, the hose probably has a hole or split and will have to be replaced.