The difference between a successful repair and a frustrating repeat visit is usually small. The belt job may be simple, but the details are where errors happen.
Here are the most common issues people run into when changing belt on Whirlpool dryer.
Mistakes that cost time or shorten belt life
Installing the belt twisted or partially seated on a pulley.
Skipping the inspection of the idler pulley or drum rollers.
Failing to clean lint while the cabinet is open.
Mixing screw lengths and reattaching panels loosely.
Testing immediately without confirming alignment by rotating the drum by hand first.
Some homeowners also underestimate the impact of venting. A restricted vent can make the dryer run hotter and strain the drive components. The belt replacement might work for a while, then fail sooner than expected if airflow stays poor.