The manual operation of the hydraulic leveling jacks is a slow process. The electric motor that operates the hydraulic system is normally powered from the coach (house) batteries, which, after quickly looking on YouTube videos for your coach, “seem” to be roughly located on the Driver side front, basement and are co-located together. Before trying the manual jack process, I would suggest looking for a tripped 100 amp breaker (or breakers with small red or yellow flag flipped out) that may be located inside the cubby with the hydraulic jack system and coach batteries. If you find and reset the tripped breaker(s), make sure you apply the parking brake; start and run the coach engine for a few minutes to hopefully charge coach batteries; then try operating the leveling jacks again, while the coach engine is running. Good luck.
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