That is something I had missed in reading the instructions. Fortunately, I haven't had an issue. I have one jack that is currently in the un-locked position but the camper is sitting on supports.
I had manual Atwoods on my previous TC. All you had to do was push the lock in and they would run down under their own weight and faster if you put a foot on the jack pad.
I have tried to "unlock" my 4500 jacks from the motor and stand on the jack pad to quickly run them to the ground. They would not rotate down under "human" pressure, I had to use the motor or the crank handle.
I would not have thought the spring and motor coupling, without the motor installed, would have kept the jack from moving. But that's what they seem to be saying and showing in the picture on the instruction.
I'd be interested in hearing what Happijac says about it.
I also wonder if the friction of the Acme screw vs the ball screw design plays a part here.
