Not much to it...
Just take off the three nuts on the top support piece, one bolt on the bottom support (Northstar Arrow).
Of course don't take out the lag screws that screw the support bracket to the camper frame...
Take the plate off the small electrical junction box, (two small phillips screws), take the connecter apart to separate the DC motor wiring).. insulate any bare ends if you are going to close up the box with no jack motor connected..
Pull the jack off, (they are fairly heavy)..
Once off use the link on here to take them apart for greasing and overhaul..
If you have a Northstar make sure the wiring enters that small junction box from the bottom, some were installed with the wiring entering the top of the box, this allows water to flow down the motor wiring cable, enter the box and flow into the camper innards via the hole cut in the frame for the cable entrance into the box...
One of the very few build flaws I found in our model...(2006)