Bizarre Hydraulic Jack Leak??

[Our20th]

I have a 2021 Redwood 4001LK that I just purchased. The jacks and hydraulic slides work fine. The problem is that there a leak of fluid around the manifold block that does NOT appear when operating the pump.

I had a mobile tech come out to evaluate with no appearance of a leak. He wiped off all the fluid that was laying on the block then we operated the slides in and out twice with no indication of a leak. I let the everything sit and checked the next day with no leak indicated. Then on the 3rd day there was a puddle of fluid on the block from just sitting??

Any suggestions will be greatly appreciated.

[SafariBen]

You just have to catch it early enough to see where the leak is coming from.



Could be an o ring is holding under pressure, but seeping once the pressure drops, or it could be a cylinder fully extended and then temperature rises enough to cause a higher pressure that causes the leak.

[xrated]

Originally Posted by Our20th

I have a 2021 Redwood 4001LK that I just purchased. The jacks and hydraulic slides work fine. The problem is that there a leak of fluid around the manifold block that does NOT appear when operating the pump.

I had a mobile tech come out to evaluate with no appearance of a leak. He wiped off all the fluid that was laying on the block then we operated the slides in and out twice with no indication of a leak. I let the everything sit and checked the next day with no leak indicated. Then on the 3rd day there was a puddle of fluid on the block from just sitting??

Any suggestions will be greatly appreciated.

Here is a "guess", based on some experience with the Lippert hydraulic leveling and having two hydraulically operated slides myself.

You didn't state whether or not, when the trailer was parked, whether any of the leveling legs were extended, but I am assuming that unless you kept it hooked up to the truck, at the very least the front landing gear IS extended and I have no idea whether you have it leveled and the other legs down. So, when the trailer is sitting unhooked from the truck and the two legs up front that we call landing gear legs, will obviously have hydraulic pressure on them in order to keep the legs extended. That pressure originates at the hydraulic manifold and would be part of the "return" line coming back to that manifold, via a Hydac valve. That is where I would start checking and see if the source is any one of the Hydacs (may be called something different if it's not a Lippert system). If it does leak like that, the individual Hydac valves are replacable and it could possibly just be an internal "O" ring inside the hydac valve body.....not to be mistaken with the manifold itself. Hope this helps

And BTW, if it is landing gear related, one thing you may notice is that the front of the trailer is slowing lowering itself because of the fluid leaking out.

[Our20th]

Thanks for the information.

Let me add this:
It is a Lippert System, 6 Hydraulic Jacks
All 6 jacks are deployed and level
The slides are in
The jacks are still firmly down when leak occurs

The leaks appears after a couple of days just sitting
The puddle of fluid is only on top of the manifold at the first of leakage
If not wiped up it will continue to run over the sides of the manifold in a couple of more days.

[hamm2018]

Originally Posted by Our20th

Thanks for the information.

Let me add this:
It is a Lippert System, 6 Hydraulic Jacks
All 6 jacks are deployed and level
The slides are in
The jacks are still firmly down when leak occurs

The leaks appears after a couple of days just sitting
The puddle of fluid is only on top of the manifold at the first of leakage
If not wiped up it will continue to run over the sides of the manifold in a couple of more days.

Have you checked and make sure all hoses are tight? My issue was one hose had backed off just 1/4 turn and would leak.

[azpete]

isnt all that is on the top of the manifold,hose connections? thats what appears on the diagram.
i would make sure the hose connections are not over tightened.thats as bad as under tightened.
as others have said, clean the manifold, use brake cleaner to get rid of all oil, then observe. unless you put leak down gauges on everything, all you can do is observe on a short regular basis. i would need to verify that it was coming from the top of the manifold, and not somewhere on the sides.
i found one like the one described here, to be an o ring between the manifold and the pump housing.
a drop very three days, off the bottom of the pump motor....
not anything to worry about, but it was under warranty, so there is that. other dealers had already replace two pump/motor/tank assemblies.

[Cvsteed]

On the extend manifold you will have some Hydac cartridge valves .. one of those is most likely where the leak is coming from

Either on the oring where the Hydac cartridge screws into the extend manifold OR on the end of the Hydac valve .. there is a manual override screw at the end of each valve that can also leak fluid


With pump not running the Hydac cartridge valves are holding the 2000 psi fluid pressure to the mid/ rear leveler jacks and hydraulic slides

Front LG Hydac cartridge valve is located directly on one of the two front LG Hydac cartridge

[sbleiweiss]

Originally Posted by hamm2018

Have you checked and make sure all hoses are tight? My issue was one hose had backed off just 1/4 turn and would leak.

This has happened to me too, twice, on the same line (left front jack). Tightening it up held for a couple of years and then the same line came loose enough to leak again. Anything that can be done other than keep checking and tightening?

[hamm2018]

Originally Posted by sbleiweiss

This has happened to me too, twice, on the same line (left front jack). Tightening it up held for a couple of years and then the same line came loose enough to leak again. Anything that can be done other than keep checking and tightening?

Maybe the non-permanent Loctite, just on the threads. The Blue type:
https://www.homedepot.com/pep/Loctit...2bdce9a015c391

[sbleiweiss]

Originally Posted by hamm2018

Maybe the non-permanent Loctite, just on the threads. The Blue type:
https://www.homedepot.com/pep/Loctit...2bdce9a015c391

My mechanic said not to use loctite. Something about the type of threads and anything on them would add to leaks.