I just got the 72D and auto-connect, mowed with it the first time last week for 6 hours total, had one issue when I first started where the mid PTO would not start. I shut the tractor down, and this issue seemed to sort itself out, continued with another 5.5 hours of mowing with no issues.
Today I took the tractor out to cut a small patch of grass, arrived at the location, engaged the deck as normal, moved about 1 foot forward, and heard a rattle and the mid PTO shut down, with the RIO shutdown message on the LCD screen. I backed up, checked the ground for any rock or obstruction I may have hit, and found nothing, so I attempted to engage the deck again. There was a consistent rattle, like the blade was hitting something every revolution. I shut it down, got off the mower, and rotated the blades by hand. I noted a spot in the rotation where I could feel resistance, and then it would give and continue with its revolution. I checked above and below the deck and found nothing interfering, so I took the tractor back to flat ground and removed the deck. Once I removed the deck, I stood it up on end (that thing is heavy by the way) and rotated the blades by hand, no interference, they spin free all the way around. I set the deck down and rotated the blades and pulleys by pulling the belt, no interference. I went back to the tractor, lowered the mower linkage, shifted the PTO to 540 and spun the mid PTO shaft by hand, no interference, it spins smoothly. I reconnected the mower deck, and spun the blades and belt by rotating the PTO shaft at 1" cut height, 3", 4", 5" and 6". The interference didn't return until I got to the 6" cut height, which is also the transport position. This is incredibly irritating, because that is the height I need to mow at. At this point, I noticed the reverse sensor seemed to be loose:
I assume this is not how it was designed, and tightened the nut, though I doubted this would fix the issue. Once it was tight, I started the tractor again, engaged the mid PTO, and had the same result as before, rattling before the machine shut off the mid PTO with the RIO shutdown message. I'm tempted to take this mower to the dealer and dump it in front of their lot, I don't have time to spend working on or transporting a brand new 5 thousand dollar mower that only has 6 hours on it. I have a feeling this is a workmanship issue, as during the first 4 hours of mowing, I found one of my rear wheel bolts in the field. That was a lucky find, so I re-torqued all of them, but this is starting to push my limits as to what I find acceptable.
Any ideas as to what is wrong with the mower?