My 631 had a problem, the rear arms wouldn"t go all the way up. Monday I decided to fix this problem, took the top of and rebuilt the piston, leather was a trick but some boiling water solved it. Had to replace the little pin in the control arm just reversed it local supplier said it was not available any longer so I reversed it. new o rings through out and gasket Now it works great. So I decided to replace PTO shaft seal. I think that about does it for now.
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