How to Use Jacks and Stabilizers

Norco Industries makes all kinds of RV stuff among them, BAL Jacks and Stabilizers. Here is a link to a page that describes "HOW TO" for different types of RV's. Hope this helps to demystify this issue. BAL make "leveling jacks" and "stabilizer Jacks" check out their website for FACTS. How to Stabilize and Level RVs

Problem with power jack on fifth wheel

First you must determine the mfg and model of the motor. With that you can get a schematic and parts list. It may be an easy fix just replacing a gear or clutch. These motors are usually designed so that the weakest link, maybe a particular gear, will give out first to protect the motor and other gears. Here is a link to Atwood with landing gear troubleshooting. Yours may be different.
Troubleshooting Landing Gear