If you're describing what I think you are the pilot valve (needle) is releasing air from the check valve that's leaking. The pilot valve decompress the cylinder so the motor isn't working against compressed air on the next cycle.
Leaking hose fittings on unloader
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]()
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
