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Rv hydraulic jack fluid.
If the leveling jacks won t retract there are several things that can cause a problem with an rv s leveling jacks.
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Some types of hydraulic jacks do not operate well in extremely cold temperatures.
If it is low fill it to the full line and check the system for leaks when operating.
All dexron 3 is hydraulic fluid but not all hydraulic fluids are dexron 3.
If you can move it lube it.
Check the fluid level and make sure it as the proper height.
If it is pink murky milky or white then it needs to be changed.
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For most jacks the fluid should be red.
I believe those are the hydraulic system and you will want to inspect the pump and reservoir.
I expect most people are smart enough to realize that using the manufacturer recommended fluid in their jack system is best just as they know not to use a 90 weight gear oil in their engine in place of the recommended 10 30 or some such.
Automatic leveling systems in rvs are always sliding up and down when you travel.
If the fluid level is fine you should hear the pump make a noise when the switch is activated.
If that is the case with yours then your manufacturer may suggest replacing the hydraulic fluid with a synthetic or winter weight.
Sometimes they don t go up as fast as they shou.