The Lippert hydraulic manifold, pump , etc are all one complete system.
There is ONE solenoid valve for ALL hydraulic slide outs and the six point leveler system has 3 valves
One located on front LG and one for each mid / rear levelers. The mid and rear are tandem with one lead and other follower
Front LG are also in tandem with 1 lead 1 follower.
Any loss of retract pressure can affect slide outs and other leveler legs if the solenoid in that circuit leaks a little. This allowing pressure to bleed off
Pic of typical six point hyd system fluid lines and solenoid valves from Lipperts manual
The solenoid valve and lines for slides are not in this pic but solenoid would be mounted on manifold where left/right mid and rear leveler solenoids are
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