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Hydraulic jack solenoid

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So on my 2007 Dynasty, I’m having trouble I think with my jacks. I keep having a sensation like an earthquake and the only thing that makes sense is one of the jacks is bleeding off. I have zero leaks that I can find, and I’m not losing fluid. My next guess is a bad solenoid, so I was wondering if anybody has or knows where I can find a diagram of the solenoid pitcher I’m including. I can’t think of anything else that would cause my motorhome to just jolt for no reason. Thanks for any suggestions.

ps does anyone need a 10k generator I think it has low hours you can give Jesse at M&M Coach Specialists a call 909-627-6000 



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Based on what you're describing I don't believe it is a leak. I had a leaking cylinder and it would leakdown after placement and gave CLEAR signs of the leak with fluid around the base of the jack.

After removal and repair of the seal it was back to normal. Never gave any sensation like an earthquake. Sounds more like a solenoid as that would cause the start/stop sensation of an earthquake.

I'm unsure of a diagram. Best wishes on the hunt.

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8 minutes ago, DavidL said:

Does this coach have suspension control arms that allow the Rig to move forward/ backwards as the coach is lifted / dropped?  If so, then they can "bind up" and release which causes that sensation.

I’m embarrassed to say I don’t know if it has the suspension control arms. I guess that’s something I should know after two years but I don’t. I’ve been sitting for a few weeks, so I don’t think it’s anything settling. It just started happening about a week ago. I can honestly say this one’s got me stumped.

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Thoroughly clean the outside of the solenoid manifold in your picture.  (Looks different than my Lippert). See if all of the solenoid valves are tight and seated, not the electrical coils, the valves. Look for fluid trails, wet or damp.

If any wetness appears by the solenoids valves drain the reservoir, remove the coil, unscrew the valve, wash the valve with spray parts cleaner.  
If one of the coils can be easily removed, take it off.  This part might take two people, or a momentary button with one person. There are two leads on the coil, one goes to ground using a jumper cable and the other lead gets attached to a momentary push button. The other side of the momentary button goes to a 12v souce. Many shops will have a remote starter push button, if the tech is old enough. That would be a good choice. The coil leads can be attached either way, 12v & Gnd, as it doesn’t care about polarity. Slip the coil onto the loose valve.

It is important that coils be marked so they can be put back on the proper valve. Some systems have a black on each coil along with a different colored wire for each coil. Once they are clean a camera would help with denoting positions of the wires.

Now that it is set up, push and release the button and you will hear the pintle lift off its seat and return, making a clicking noise. Spray openings in the valve while pushing/releasing the button for about 5 second.  Intake/choke cleaner would be my choice of cleaner here. Flush thoroughly to remove any deposits. 

When reinstalling the valves, cleanliness cannot be stressed enough. A tiny particle can keep valve pintle from seating.

Once the valves and coils are in place, add a quart of anti stiction fluid, finish filling the reservoir prescribed fluid as in owners manual, and cycle the jacks 3 or 4 times. With all jacks up verify fluid level and top off a necessary.

It may be necessary to cycle jacks several times to mix anti stiction fluid thoroughly to have it stop “going bump in the night.”

Google:     Anti stiction fluid        for an afternoon of reading!



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  • Solution

Thanks Mark, after reading your reply on how to go about fixing this I’m going to clean everything off real good and check for loose fittings. I should be heading home in a few weeks. I think I can live with it that long and I’ll have my shop do it, it sounds like one of those jobs. I’ll start and screw something up lol. I feel better knowing that my guess on this whole problem was right. I appreciate all your guises feedback. 

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