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Old 06-04-2018, 10:31 AM   #1
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Lippert jacks leaking down while driving

Lippert jacks going down while driving. a 2004 Forest River motorhome has lippert jacks and they are going down while driving. You can run them all the way up and within several minutes they have gone down several inches. Not all of them are going down the same amount. I believe the solenoid valves are leaking, but find it hard to believe all 4 are leaking at the same time. Has anyone run into this with lippert jacks.
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Old 06-04-2018, 12:47 PM   #2
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Originally Posted by ga traveler View Post
Lippert jacks going down while driving. a 2004 Forest River motorhome has lippert jacks and they are going down while driving. You can run them all the way up and within several minutes they have gone down several inches. Not all of them are going down the same amount. I believe the solenoid valves are leaking, but find it hard to believe all 4 are leaking at the same time. Has anyone run into this with lippert jacks.
Do these have the usual retraction springs? As HWH does?
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Old 06-05-2018, 07:11 AM   #3
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Do these have the usual retraction springs? As HWH does?
NO! they have power up, power down. No springs.
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Old 06-05-2018, 08:44 AM   #4
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NO! they have power up, power down. No springs.
I found this manual online, might be of some help. https://www.manualslib.com/manual/13...page=18#manual Page 18 shows all 4 retract lines tee together into 1 port of the valve block and page 17 shows a directional solenoid. This is a bi-directional solenoid that shifts one way to flow pump pressure to extend side of cylinders through each cylinder solenoid as needed and shifts the other direction to pressure all 4 cylinders for retract through a common valve port. To stay retracted the pressure in the retract lines must be greater than than the extend side. My first suspicion, easiest to check, would be the directional solenoid has some leakage either around a seal of small grit sticking in it.
Because all 4 retract lines are connected together if any 1 cylinder has a worn internal seal the pressure will equalize and all 4 will drift. This would much harder to identify as each cylinder would have to be pressure tested individually.

If it was mine I would inspect the directional solenoid first, even replace it if nothing obvious found.
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