Check all hardware, idler pulleys, idler arms for wear by hand making sure everything is tight & secure. Idler pulleys & bearings do wear out. also check springs, bushings, etc. let us know how it goes, thanks, Mark
I have a 2010 Simplicity Broadmoor with 46" deck. Upper & lower idler arms have bushings inside that used 3/8" bolt that passed through bottom of deck then through bushings inside idler arms with nut on top. Upper idler arm cracked almost completely through with approximately 1/8" left hanging on. Welded idler arm & drilled bushings to 7/16" also drilled bottom of deck & 1 bracket. Picked up grade 8 7/16" bolt 2 & 1/2" long with 1 & 1/2" shank on bolt, no threads, 2 flat washers & a self locking nut. Submitted improvement to Simplicity with no reply. Problem was 3/8" bolt could not handle torque when engaging & disengaging PTO. When I removed 3/8" bolt found it to be stretched & warped.