I am not sure about your model, but after months of trying to find an answer for my 8526RLWS I was able to get manuals from Lippert that explained everything.
For my main slides, I need to use the landing gear crank through a hole in the OPPOSITE slide skirt to open or close the main slides. The handle goes on a stub shaft with a cross pin in it.
For my Wardrobe slide, (made by NORCO), there is a short (about a foot long) flex extension that I initially mistook for a workman's tool that is used on the back of the electric motor. It has a hexagonal socket on one end and a hex drive shaft that will fit a battery operated drill or screw driver. You will need to remove the upper trim panel to access the rear of the motor.
For completeness on this topic:
To manually raise or lower the landing gear, you use the hand crank; but first you must access the drive stub. It is located in the "driver side" propane compartment above the tank behind a black piece of tape.
To manually raise or lower the electric rear stabilizers, you use the same landing gear crank on the stub shaft OPPOSITE the drive motor side.
Hope this helps in your case.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW