There are multiple belts on the Ariens A20VA46 lawn tractor. Which belt are you asking about?
Service and Owner's manuals can be downloaded from the following link: Find Manuals by entering your tractor's model and serial numbers.
The deck drive belt is easy to change by releasing spring pressure on the idler pulley (usually under a plastic cover). See the user's or service manual for directions from the above link.
The two transmission belts are somewhat more difficult, but are usually long-lasting. The newer type of continuously variable transmissions used on these tractors have a friction belt like a snowmobile but under much less load. As a result, they are long-lasting. The engine to transmission belt is a conventional V-belt and may require occasional replacement. Usually, there's a similar tensioner pulley you would release in order to replace this belt.
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