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Leaking hose fittings on unloader

351 Views 15 Replies 3 Participants Last post by  stevon, 
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Hi All,
I am trying to sort out a Devillbiss Pro 4000 compressor. I believe the model number is RA350E30AD.

The issue that I am currently having involves the tube that travels from the lower end of the manifold and up to a needle valve. I believe that the needle valve activates the switch to start the compressor when tank pressure drops too low, but I am quite new to this machine.

The compressor arrived with a nylon (or some other plastic hose going from the low end to the needle valve. It was leaking badly when I got it, so I have tried different combinations of hoses and connectors, including the type used on a 1/4” water supply to a fridge (hose seems to be the same size).

In every case I have had a leak — usually the hose pops off of one end or the other. I finally thought I had it solved by using some fittings typically used on air shocks, but they are leaking too…

Any suggestions will be welcomed. I have a pressure switch from another dead compressor. Is it worth trying to ditch the hose setup in favor of a an electric pressure switch?

And while I waited for this thread to be approved, I just read another thread in which the check valve was the culprit. I will look into that this morning, as the hissing/leaking is constant after filling, not just a few seconds.


Thanks,
David


Motor vehicle Automotive tire Automotive exterior Gas Rim
Motor vehicle Automotive tire Automotive exterior Gas Rim
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This is becoming more of a reference thread as I have received no responses but may be on the verge of solving the issue myself.

Based on threads I have read on this forum, I began to suspect that the issue is actually the check valve. A short while ago I removed the manifold (the check valve is in the base) and inspected the check valve.

A visual inspection was not enough, so I pulled the plastic end off, freeing the stopper and spring. That is when I discovered the issue… the spring had snapped in half, meaning the stopper would never actually move all the way to close the valve.

I am headed to the hardware store to replace the spring. Hopefully, by tomorrow this compressor will be functioning as it should :)

Thanks,
David

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Hi Flop,
That is what I am thinking, and I have pulled the check valve and found a broken spring…

Thanks,
David
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Now I am wondering about the importance of the exact tension of the spring…

Thanks,
David
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Hi All,
It worked! Pressure on this new-to-me compressor holding steady at 109 psi.
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Hi Flop,
Thanks — that is the kind of info I need! I am fairly new to these larger compressors with this type of pressure switch.

Thanks,
David
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Hi Flop, Stevon,
Noted about the high pressure. Stevon, I have already pulled the manifold (check valve in base) and replaced the broken spring. The compressor has been holding almost perfectly steady for several hours now, losing only about 3 pounds in that time.

Thanks,
David
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Hi Stevon,
I couldn’t find the check valve for this compressor (the part is integrated into the manifold and had been discontinued), so I resorted to fixing it with a 69 cent spring.

Thanks,
David
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