How does the idller pulley come off the shaft.
There is normally a e ring or a ring that goes on the shaft that would need to be removed to get the pulley off.
Should there be play between the idler lever and the motor mount? Should it move up and down a little bit?
There will be nominal play of less than 1/8" on the idler lever. If it just wiggles a little it is not a issue but if it is a extensive amount then it would be an issue.