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Speedaire 4ZK99A Problem

Toadman!

Member
Joined
Jul 8, 2022
Messages
8
Hello all. I have a Speedaire 4ZK99 "piggyback" style regulator. It's only a little over a year old. I have filters and dryers before and after the regulator. It started making a noise like a horn, bleeding air out of the hole on the side, and wouldn't regulate, the pressure would just climb. So, I replaced the diaphragm in the top and it worked for a few minutes then started doing the same thing again. So I took off the bowl and removed the hard white filter and unscrewed this white plastic piece to find there's a little valve up inside with a small rubber washer that's made onto the valve and the rubber was torn on one side. So I ordered this part (114X53) and once again it worked for a few minutes and back to the same thing again. I don't see anything left to change, is anybody familiar with this issue? If I have to replace the whole thing can someone recommend a better brand? Thanks.
 
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Steve_P

Well-known member
Joined
Sep 15, 2010
Messages
5,185
I don't know the answer, but I had this issue years ago with a Wilkerson regulator. It was a fairly new regulator, like yours, so I called Wilkerson and the guy said something like, "this happens sometimes...." and they sent me a new one. I'm personally not going to try to rebuild something like this as they're not too expensive; if it fails again, I'll just buy a new one.
 
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Toadman!

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Joined
Jul 8, 2022
Messages
8
I'll prob do the same, I just want a different brand. But another one of the same would be a direct fit. Just irritating.
 
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Steve_P

Well-known member
Joined
Sep 15, 2010
Messages
5,185
I hear ya. I kinda treat it as a consumable after that, but for home use I do expect it to last more than two years, which is why I called Wilkerson that time.

I'm sure others do this also, but Wilkerson makes a modular system where you can swap out components without unthreading the piping. They have end blocks and then o-rings seal to the components.

 
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Toadman!

Member
Joined
Jul 8, 2022
Messages
8
Nice, thanks. I'll look into that. I would hate for it go down in the middle of spraying the last coat of clear on a vehicle.
 
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