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Old 08-11-2012, 08:20 PM   #1
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Front hydraulic jacks dropping when hooked up

Hi everyone, new to this particular forum, but have a problem with my 05 Cedar Creek 37RDQS in that my right front jack will drop to within one inch of the pavement and the left one will drop approx 2 inches. This happens only when hooked up ready for travel. The unit sat for 8 months in my shelter and did not drop an inch. The camper repair place says that it is a by-pass solenoid or something like that, but I called and talked to lippert and they recommended doing a by-pass check on the cylinders in the front legs. Since the switch is located on the side of the camper, I can't reach it to perform this check, and if the switch is pushed "DOWN" you have one heck of a mess. That is why I do not request the help of the wife. It is currently in the shop and I received a call this morning stating that they had closed the legs off and there was no drop (what ever that means) so they were going with replacing the by-pass solenoid. For some reason, I can't but help but believe that the problem is the cylinder seals are allowing fluid to leak past but not out of the system. I sure would hate that their fix did not fix the problem and I had to pay for both their fix and new cylinders.

Any comments would be appreciated.

TIA, Curt Hinson
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Old 08-11-2012, 08:36 PM   #2
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Hi everyone, new to this particular forum, but have a problem \ that they had closed the legs off and there was no drop (what ever that means) so they were going with replacing the by-pass solenoid. For some reason, I can't but help but believe that the problem is the cylinder seals are allowing fluid to leak past but not out of the system. I sure would hate that their fix did not fix the problem and I had to pay for both their fix and new cylinders.

Any comments would be appreciated.

TIA, Curt Hinson
"Drop" can be a short version of "pressure drop". Its when a device using gas or fluid is put under test pressure and watched with instuments for change. It could mean no piston movement, no internal leak or no external leak, because the pressure applied is constant. A solonoid is lots cheaper than two jacks. Hope it works for ya. Welcome to this forum.
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Old 08-12-2012, 05:58 PM   #3
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I would bleed the lines of air ensuring a vacuum when you power down the Hydraulic system.
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Old 08-12-2012, 10:38 PM   #4
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I would bleed the lines of air ensuring a vacuum when you power down the Hydraulic system.
From what I've read, the Lippert system in the Georgetown uses bidirectional operation where there is always pressure on jack pistons and slide cylinders, both sides. Other designs used various RV's used the same principle. When the system commands a change in position, the piston is powered on one side and released on the other. When you release the power, the piston locks in its new position. This accounts for the numerous hose failures both black and orange which are deploy and retract. Always pressured, guessing around 1600 psi. There's and alarm on the controls to warn of low system pressure (1500 psi). The system is self venting of air just due to the fluid returns to the tank each time the pistons are retracted. Note there are no return springs on anything therefore you need pressure to return and hold. They think the ops problem is a leaking valve that holds the return pressures.

I checked the Lippert and Cedar Creek web sites and at least mostof them use the hydraulic system I'm referring to. Can't tell what it was in 07 but not a lot has changed.
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Old 08-12-2012, 10:40 PM   #5
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I do want to apologize for not getting back with you guys, but I have been busy. I am going down the the RV Repair tomorrow morning to tell them to replace the solenoid which is what they wanted to do in the first place. Actually, I had already told them to "FIX THE DARN THING", but things being what they are, they probably did not hear me.

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I would bleed the lines of air ensuring a vacuum when you power down the Hydraulic system.
Mikey, I am sure that there is no air in the lines. The reservoir is filled up to within 1/2" (or less) from the top and I always run the pump for a few seconds after pulling everything in (and up).

The problem is not with the jacks extended. It sat for 8 months under the camper shelter with no leak down. When the camper is hooked up to the truck, the feet start to drift down. The right one will drop to within 1" of the driveway. The left one drops approx 2". There is no oil leak anywhere.

I have pictures and will post them as soon as I locate them. I think they are on my notebook.

Thanks for the replys.

Curt
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Old 08-13-2012, 12:26 AM   #6
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As promised, here is one picture of the front jacks showing the drop while hooked up to my truck in front of my garage.

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Old 08-13-2012, 08:55 AM   #7
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Have you attempted to tighten the manifold solenoids rhat serve these jacks? They can bach out. On top of pump turn CW to tighten each location.
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Old 08-13-2012, 09:28 AM   #8
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Have you attempted to tighten the manifold solenoids rhat serve these jacks? They can bach out. On top of pump turn CW to tighten each location.
Sorry mistype- CCW to tighten
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Old 08-13-2012, 09:32 AM   #9
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Have you attempted to tighten the manifold solenoids rhat serve these jacks? They can bach out. On top of pump turn CW to tighten each location.
No Vince, I did not check the manifold solenoids. The repairmen at the RV repair center was quite certain that the manifold solenoid was the problem. I do not have the camper since I delivered it to them last week and just this morning I called and told them to fix the camper. I can't use it the way it is. The only alternatives I have to fixing it is to trade it in (they would like that) or get out of camping for ever.

Curt
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Old 08-13-2012, 09:36 AM   #10
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Sorry mistype- CCW to tighten
Thanks for the correction Vince. I keep these type of things for future reference since I perform at least 95% of all of my repairs. My arms weren't long enough for this one, and I didn't trust the wife to push the button.

Curt
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