most hydraulic slides use automatic transmission fluid so that when it leaks you can see red stains on the ground..
When you power up the slide, listen to where you hear the pump running and open the cubby door and look in the reservoir and see how much fluid you see...
The system stores fluid in the back side of the cylinder so when the slide goes one direction the fluid on the other side returns to the pump...
I'd guess if the tank is full and you don't see a leak, some of the valving is rusted and won't function correctly or the electrical wiring to the solenoids might be loose...
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Retired Business Owner, Re-manufacturing HD Clutches, Brake Shoes, Air Compressors, Sales & Installation of PacBrake and other Industrial Friction
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