Having difficulty with the 790 mid-mower. The tractor came with lift rods that wouldn't let the mower down or up more that a few inches. Dealer changed them out only to have the J-Bolt crack and the mower dropped bending PTO bracket and lift rods. Neither JD or the Dealer seems to know how the mid-mower fits on to the JD 790. After waiting 2 1/2 months for delievery and now having the little darling back at the Dealership "awaiting" parts, little frustrated. Anyone have similar experience and possible explaintion?