How to Troubleshoot & Replace Whirlpool AP6021532 / WPW10446781 Idler Arm Spring

Replaced pulley tensioner , belt . Felt and roller wheels 

Purchased new parts.....parts came in next day as stated. Parts were correct and are not installed. This is the third time we have used this site for parts. so far, very satid=sfied 

Using You Tube How-To Videos. Replaced the drum drive belt and tensioner pulley/arm (including) the spring. 

Watched the repair videos on Appliance Parts Pros website. Installed the dryer repair kit in about 2 hours. Vacuumed out the lint and pet hair while the cabinet was apart. Dryer now runs very smooth and quiet. 

A friend's dryer was squealing. It was the idler pulley. I lubed it but I was sure it would only be a temporary fix. Sure enough, a bit later the drum would not spin. The metal bearing in the pulley fell to pieces. The shaft it sat on was scored. We decided to change the belt while we were at it. The first video I watched was on Appliance Pros. We used it as a guide. We had a bit of trouble getting the front control panel off since our model differed a bit from the one in the video, but we figured it out. The whole job took about 1.5 hours, but we cleaned the inside really good while we had it apart. Taking a few pics along the way was helpful....it's easy to forget where a certain size screw goes or where a cable plug should go once you remove it. 

Replaced all off the parts and cleaned all the others inside of the dryer 

The step by step video is the way to go. Changed the rollers, pulley with pulley arm, and idle spring. Use a vacuum to clean while everything is open. Most challenging part was the triangle clips and getting the belt back on the pulley only because I couldn't envision how it was supposed to regain tension... most likely not a problem for others, but I couldn't see it in my mind. Watched the video a few more time and got it working no issues. Very entry level experience needed and feels great to accomplish. Gloves help with sharp pieces and pushing the triangle clips on. 

Replaced all the wear parts and tension spring. 

I ordered the idler bearing with arm, also decided to do all belts and drum support wheels, forgot that there are 4 and order only 2. I did the work myself. I am industrial Tech by trade. So not too hard. I did watch a U -Tube video for familiarization. It is a job any home mechanic could do. 

Idler pulley/belt tensioner failed. Chewed up the belt.