Not sure if you can get to the top of the jack on that side or not, it could just be a sheer pin. If you can get at it to see the top of the jack, pull the cover off and look inside wile someone activates the motor and you should be able to tell if the shaf is turning or not. If not turning it is the sheer pin.
2008 Ford F450
2015 Seismic 3912