Originally Posted by Skip51
Today I was going to install Sumosprings on my 2400W when I ran into a problem. I went to use the Mercedes jack that came with the MH and it didn't work. It works fine with no weight on it but if you try to jack up the MH the inner piston comes up and makes contact with the frame, then the outer piston comes up around the inner until it makes contact with the frame then it all just sits there, not moving no matter how long you pump it. I've been a fairy competent shade tree mechanic for about 45 years and I know how to use a jack (and rather long winded it seems). I tried opening and closing the valve a few times, even turing the pistons, nothing.
The point is I would suggest every one with a MBS MH pull out the jack and make sure it actual works. Imagine being in the middle of nowhere, no cell service and you can't change a flat because the jack don't jack.
I'll update this if Meredes says anything other than "here's you're new jack"
If you jacked it up that high before it made contact with the frame then maybe it won't go any higher. Put a couple of thick boards under the jack and try again.