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After 6 decades on the planet I can still climb behind all these washers and dryers. I actually think this keeps me young and pliable. 

This Maytag dryer in Shawnee, KS was real super loud and squeaky and needed a Whirlpool dryer tune up kit. This kit consists of 4 drum rollers, a drive belt and an idler pulley and works for many Whirlpool made dryers. These are all the main friction parts of your dryer and need to be replaced every 2-4 years depending on the dryer's usage  and surroundings. Like the brakes on your car, friction parts don't last forever. They wear out. It's one of the basic laws of the universe.

As a general rule for dryers, if you hear thumping or knocking it's probably the drum rollers and if you hear chirping or squeaking it's more than likely that it's the idler pulley.

If your dryer starts to make any noises that it wasn't designed to make like a knocking or a squealing then it's time for a tune up. It needs to be done before the excessive drag that the worn out dryer parts are having on more critical components like the dryer drum drive motor becomes a problem and the drum won't spin. Now we're delving into the unnecessary and expensive dryer repair costs that could have been avoided.