I have a 08 flhtp just picked it up about a week ago. Guy told me the belt needs replaced, as it does. It has some teeth that are starting to come apart per say. It has 48k on it was told at 50k they need changed, anyway. The belt was way loose! So I jacked up the bike loosened the right but, tightned from the belt side , used a tension gauge with 10lbs of pressure. Held the belt side and tightened down. Rode 5 miles come back the axle walked loose again and the belt was loose? Did it all over again. Tighten to 105ft lbs. dang thing still comes loose? Anyone have any suggestions on to why the axle keeps coming loose? Really wanna get this figured out. Will be taking it next week to get the belt changed and I'm sure my Indy will fix it. I'm just curious for myself why it keeps coming loose. I see no reason why it would! And when it comes loose the pulley rides against the swing arm. Anyone have a diagram that shows the axle set up? As in spacers and what not if there are any? Guy I got the bike from had the tire and wheel off so I'm wondering if he lost a part. Thanks!

 

See attachment; maybe it will help.