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Old 10-24-2019, 05:01 PM   #1
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Join Date: Feb 2019
Location: Cypress
Posts: 1
M.O.C. #23545
Lippert Jack Problems

For those of you interested in Lippert hydraulic leveling jacks, here is a brief summary of the problems we recently experienced and my conclusion/recommendations. Apologies for the length.
1. While traveling, were alerted by passing motorist that our left center jack was descending.
2. Stopped and retracted manually using control pad.
3. It happened again so we put a ratchet strap on it.
4. Next were alerted left rear jack was creeping down.
5. Manual retract using the control pad extended the rear jack instead of retracting it. Really confused at this point on a rainy Sunday afternoon on the side of the interstate (no LCI tech support).
6. Finally disconnected hydraulic control lines to the jack, applied ratchet strap and traveled to nearest campground (Osage Prairie in Nevada, MO; really helpful folks). Upon extending slides, noticed fluid coming from disconnected lines.
7. Added ATF fluid, retracted slides, and ratchet strapped jack into place. Traveled to next stop. Noticed bottom of both slides had moved out a couple of inches during travel. (No pressure holding them in)
8. Repeated 7. for a second day. Arrived at next stop in northern Indiana. Travel is extremely stressful constantly checking jacks and slide outs.
9. Went on (minus RV) to Lippert headquarters for tech support (1902 W Sample St, South Bend, IN 46619) and told a very sad story. Very understanding folks and eager to help.
10. Received hydraulic jack bypass test instructions and a new jack assembly (gratis).
11. Returned to RV and installed new rear jack. Tested center jack. No issues. All works properly. At night, noticed popping noises from front jacks. Not sure why (trapped air?).
12. Completed trip and disassembled defective jack. Found piston head separated (unscrewed) from piston stem. Found scoring on piston stem and wear on lower piston seals.
Conclusion: When the piston head vibrates loose (separates) from the stem, retract pressure acts between the piston head and the stem to pump it out. A confirmation is that the jack will not completely retract with a ratchet strap due to the disengaged threads. The unstabilized jack stem can move through its seal bore at an angle causing scoring.
Recommendations: Carry 1/4 JIC hydraulic fittings to plug or bypass the jack or slide-out control lines. Carry extra ATF in case you have a leak. Carry 2x4 or 2x6 studs (cut to length) to prop slide outs closed and 4 ratchet straps to retract jacks in case of total hydraulic failure. Monitor jacks for full retract; any exposed stem indicates a potential problem.
Im still unclear why the jack pressures also appear to be connected to the hydraulic slide out controls. If anyone has a schematic, I would appreciate it.
Happy RVing yall!
2017 Montana 3921FB
2018 GMC Denali 3500 SWT 6.6 L Diesel
Andersen hitch
Part timers from Cypress TX
A&M is offline   Reply With Quote
Old 10-24-2019, 05:21 PM   #2
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Join Date: Aug 2007
Location: Omaha
Posts: 6,254
M.O.C. #7560
Austin-- Sorry to hear of your level-up problems. It sounds like LCI(Lippert) took care of you but if you are still having problems, I would give their Customer Service a call and let them know what is happening. The popping sounds is indeed air in the lines and it is moving. There is instructions on the Lippert website as to what to do for this problem. You drain off a quart of the fluid in the reservoir and add a quart of CAT oil to the tank and cycle system numerous times to get the air out of the level-ups and lines. If you go to the Search Engine at the top of the page here on the Forum and key in Popping from landing gear or level-ups you will find multiple posts about this specific problem. Keep us up to date on the outcome of your level-up situation.
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Old 10-24-2019, 06:10 PM   #3
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Join Date: Dec 2017
Location: Mountain Home
Posts: 387
M.O.C. #20949
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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