Have been in similar situation, and could not release the attachment. Recently, I needed to haul a downed pine tree. It had been limbed, so I only needed to move the 85' of trunk which varied from about 10" to 30". I sat the bb on the small end, and chained the tree to the bb. Lifted it with 3ph, and proceeded to move the tree. Worked great until I started over a knoll when the bb lifted the rear end of the tractor. Front axle just dug in. Couldn't go forward, couldn't go back, couldn't release the bb. Working alone. %$#$*&(*&(* !
After a small tantrum, I started looking at things logically......*#%@*! anther trantrum. Didn't have my chainsaw with me - (that won't happen again)
But, I did have my trusty double bit axe. I am sooo glad that I had sharpened that puppy the day before. Took about an hour of serious logging work, but finally got the log to yield so the chain could get a little slack.
message - never bind the bb to anything the bb is sitting on. Works fine as long as the plane of the tractor doesn't change. Otherwise you could be in trouble.
After reflecting, I'm fortunate that I didn't overload the 3ph arms or worse !
k