I will most likely get this wrong but here goes. I used to have a 5th wheel with hyd. slides. Above the pump there was a manifold that directed the fluid to the correct location. Within that manifold was a hex screw that was the manual operational thing. I would have to get a drill (for the rpms) and use it to bring the slides in. Find the mfg of the slides and pump they should have the correct way to do it.
Retired and never looked back