Abstract: A bail assembly including bail means moveable between operative engaged positions and a disengaged position; all actuating means for quickly moving the bail means between the operative engaged positions and the disengaged position, and holding means for holding the bail means at any selected operative engaged position. Preferably the holding means is a selectively releasable self locking hydraulic cylinder assembly which includes adjustable holding means, a locking chamber associated with the adjustable holding means which may be filled to lock the adjustable holding means, control means for controlling flow of fluid to and from the locking chamber, and actuating means for selectively actuating the control means.