Remove the broken drive belt and study how the belt connects the motor shaft with the brush's drum. Some models require you to pull out the brush to attach a new belt (our model didn't). Install a new drive belt by first threading it around the drum. Using a large straight-slot screwdriver, pry the other end of the belt around the motor shaft's roller. Spin the drum by hand to check the tension, then reinstall the cover plate.
Replacing broken or stretched drive belts is one of the most frequent repairs for canister vacuums. Inside the motorized carpet-cleaning head, a rubber drive belt connects a small motor to a spinning brush that beats the carpet pile and loosens dirt to be sucked up into the machine.
Jot down your vacuum’s brand and model, and buy a replacement belt at either a fully stocked hardware store or a vacuum cleaner service center (search online or look in the Yellow Pages under “Vacuum Cleaners, Service & Repair”). A belt costs about $4; buy several so you have spares. Then, take about 30 minutes to repair it yourself.
Unplug the vacuum cleaner and follow the steps shown in Photos 1 and 2. Once the new belt is on, ensure that it’s properly installed and centered on both drums by turning the motor shaft by hand. If the belt is properly sized and installed, it’ll spin the brush.