[Carl n Susan]

Raising the legs use the weight of the RV to help. But extending the leg has to work much harder as it is fighting the RV weight. You have the classic signs of a broken shear pin (easiest to fix) to a stripped gear in the leg assembly. I have no idea what brand of leg you have on a 2012 HC. Earlier Montanas used legs from Venture manufacturing. They are great to deal with and have replacement parts from shear pins, to gears to entire legs. I think the manufacturer's name is usually under the cap on the top of the leg. I have diagrams of the Venture (which are similar to the others) legs. PM me your email address if you are interested.

While one motor works, if you decide to add a second one it should match the original.