There most definitely is a reservoir that the pump draws fluid from and when the jacks and hydraulic slideout mechanism are retracted the fluid returns to. Usually the pump is on the end of the reservoir. Most, if not all will use Dexron III ATF.
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Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7
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