have a 4300. it seems that i left the mid pto engaged while brush hogging which allowed the grass to wad up around it and get 'sucked in' damaging the seal. drips now. has anyone ever changed this? is it possible to pull it and replace from the outside? have to get my service book out and see what it shows, but hoping someone else has done this and can verify. sure hope i don't have to split it or something crazy to get rid of a small drip!