the pto on my 88 likes to spinn when the tractor is warm i thinkthe clutch is draging a bit would i have to put in shim to get it to stop or would i have to rebuild it .when i use it alot it spins alot more . when i mow or chop it is in and out alot and when i switch imlements ti is hard to stop it and put on the pto shaft with your hands