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Old 11-10-2009, 08:23 PM   #1
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HWH Jack Won't Stay Down

Problem: All jacks extend, but one jack retracts once the pump shuts off.

Turned out that the solenoid valve's needle valve end (which threads into the inside end of the solenoid valve body and seals into the inside of the manifold w/its own set of o-rings) had the lock nut come loose and unthreaded till the nose was left in the manifold when the valve was removed. If you don't know what the end of the valve looks like, you wouldn't know to go diving in the manifold to retrieve it.

If the nose end can be retrieved, and the solenoid part is still working, you should be able to re-seat the nose to seal against the needle, tighten down the lock nut, and reuse the original valve. You may want new o-rings (there are 5 total of which 3 are "square-rings" rather than standard round o-rings. If the solenoid isn't operating properly, then you will need a new or rebuilt valve.

Hope this helps somebody w/an otherwise goofy diagnosis.
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Old 11-18-2009, 03:11 AM   #2
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Put another way, when you unscrew a solenoid valve (to replace it for example), you might notice that the part of the valve that comes out has a needle (instead of a plunger) sticking out of it. That's because the plunger portion of the valve is still stuck in the manifold. When you unscrewed the solenoid valve, you were inadvertently separating the valve components. To get the part out, you have to essentially screw the solenoid valve back in just until it attaches to the part still stuck in the manifold. Then, you have to wiggle the solenoid valve as you pull it (and the plunger part) out of the manifold. However, if you screw in the solenoid valve too far (into the manifold), you won't be able to pull it out.

If that doesn't work, you can try to grab the detached part with some pliers but you risk damaging the threads in the manifold or the threads on the piece that's stuck. Anyway you slice it, its a long day. Been there. Done that. Good post Mike. Will definitely help someone someday.

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