I recently had a 47 backhoe installed on my 4310. Over the weekend I went to remove the backhoe and the rockshaft didn't drop far enough to disengage the hooks, so I had to set the backhoe on a pallet to get enough clearance. I then reinstalled the 3-point links and I-Match and found that the rockshaft no longer drops down far enough to pick up implements. Prior to the backhoe installation the I-Match would drop down to within 6-8" of the ground but now it's more like 18". The rate of drop knob is all the way counter-clockwise and there is nothing visibly binding to prevent it from dropping. I checked the technical service manual and there are no troubleshooting procedures or adjustments for rockshaft drop, so apparently it's not a common problem. Ideas? The dealer is sending a guy out tomorrow but I'll feel real stupid if it's something I've done.