AnEv942 wrote:
Thanks Billtex-manual isnt with the pdfs located in the TCU.
So the lever in free position will allow jack to travel on its own. Either down or pushed up by load.
I assume then nothing wrong with the jacks, you switched to free, removed the handle and did as design allows.
I read, either manual jack or elec., switch lever to free and it is. Yous, due to lube, maybe more easily able to 'free' wheel, but not the cause. Actually seems what 'should' happen.
Incorrect. The (normally operating) jacks cannot be retracted without the crank or motor. That's the whole point of the one-way brake system. The manual mentions locking to prevent the jacks from extending.
Also, only the 4600 model jacks can be lowered manually with the lever disengaged. The 4150 and 4500 need to be cranked or powered. The 4150 is acme thread which cannot be backspun and the 4500, though ball screw like the 4600, does not have a roller bearing under the horizontal gear so the friction between the gear and square plate acts like a brake when you try to push down and free-spool the jack.
