[Motor31]

I'm assuming your unit is not one of the early non hydraulic equiped trailers. If it is indeed an electric motor only system do try the manual extention method.

If the unit is hydraulic try these steps. Check to see if all of the knurled knobs on the solenoid activators are turned out (counter clockwise). If they are not out the fluid will bypass the item that it controls.

Make sure you have fluid to go beyond the half way point on the reservoir when everything is out. If not you will end up sucking air into the system. Mine has a bit over 1/4 inch of fluid above the mold seam of the reservoir when slides and jacks are extended. There is plenty of space in there when everything is retracted too.

If there is no pump action (running) when you use the jack switch you may just have a bad switch.