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Leaking hose fittings on unloader

349 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


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stevon
2002sheds,

It sounds like your check valve is leaking from tank back pressure. check valves always eventually fail and are a cheap maintnence part like the air filter that occasionally needs to be replaced, Grainger can help you out, just bring in the old one to match up.

Stephen
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Stephen
2002sheds said:
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stevon
flopshot,

Don't go too far, your tank label is stamped with maximum working pressure (WP) so don't go over that! 155 psi WP is typical for single stage compressors.

Stephen
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flopshot said:
Couple turns of that larger nut might get you a few more pounds if you need it.
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stevon
David,

A check valve is a maintenance part and is readily available and relatively cheap they do wear out and leak, my self I wouldn't rebuild one but if it works for you kudos!
There should be 0 leakage from a good/new check valve, just make sure compressor has no power when not it use!

Stephen

2002sheds said:
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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stevon
David,

That's too bad about there being no replacement check valve available, parts sometimes do become unavailable especially if it fits only one type/brand of compressor. Sometimes there is a way to plumb in another type of check valve but sometimes not! At least your machine is still in use and not contributed to waste/land fill lol.

Stephen

2002sheds said:
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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