A week or two ago we went to level the motorhome in the driveway so we could put the slides out. When we turned the LCI panel on we saw the Jacks Down
light was lit. All jacks appeared to be up. Retract All
ran the pump and the light went out.
A few days ago we raised the jacks and just two hours later I saw the passenger rear jack had dropped 3 1/2" and was now only 3" above the ground.
I hit Retract Al
l and it went up.
It poured here yesterday so I did not check the light but the jack stayed up. Today the Jacks Down
light was on again.
There is an Emergency Retract
feature where if the system thinks all jacks are not fully up and
the Parking Brake is released the pump will automatically start and build pressure to retract the jacks. There's also supposed to be some kind of alarm or buzzer; the manual is unclear. This happens even if the panel is turned off.
I started the engine, put my foot on the brake and released the Parking Brake. I heard the pump start and the Jacks Down
light went off but there was no alarm.
I called Lippert and their tech support line is as good as everyone has said. The fellow said that the alarm will only sound if motion is also detected, which means the leveling sensor detects one axis has changed, so it will not sound if you're not moving.
He also advised that if we're driving and the system pressure starts to drop the Emergency Retract
will build pressure and retract the jacks. So there should be no way for a jack to go down and hit the ground while driving unless there is a massive leak on the Retract side and the pump cannot build pressure.
He advised that the Jacks Down
light works solely off of a pressure switch on the hydraulic manifold. If the pressure on the Retract side drops below 2,150 PSI then the switch will close and light the Jacks Down
He is certain we have a jack bypassing internally and gave me the test procedure:
- Hit Retract All until the pump stops.
- Remove the Extend hose from one jack, which should be the orange one. You may see a dribble of fluid when the hose is removed.
- Hit Retract All again.
- If you see fluid coming out of the jack then the jack is bypassing internally.
- Repeat for the other three jacks.
- It can be any jack that is bypassing, not necessarily the one that drops.
I did see that the bypass valve Allen screws on all four solenoids were not snug so I snugged them up but the light was back on today. The tech said that if the valves are cracked at all that can cause the jack to drop. Maybe that is why the one jack dropped; I don't know. One pic shows my Plan B.
The motorhome is at a local truck shop right now and they will do the bypass test so we'll see how expensive this gets...
I circled two of the solenoid bypass Allen screws and there are two on the other side. They are backwards, so you turn them counter-clockwise to close the bypass valve.
The black cap on the motor can be popped off and the pump can be rotated with an electric drill to manually raise the jacks once the bypass valves are open. Unfortunately that motor is below the lip of the compartment so you would need some kind of 90-degree adapter to turn the socket placed on the motor.
I hope this helps shed some light on how this system works.
Btm, I think I saw a post from you three years ago where you had something similar happen? Do you recall how much your bypass valves were from fully closed? Did closing those valves fix the problem?