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Don't know exactly why, but you have a restriction in the air outlet. Yes, it could be the regulator...or a kinked or defective air hose. Check the regulator...if you have previously removed it for proper direction of flow. There are small cast arrows on the regulator indicating proper air flow direction. Foriegn matter, dirt, or teflon tape may inhibit the flow at the regulator or a fitting. If the unloader tube was replaced as originally done I cannot think if how that could affect the flow....as you say the regulator is reading full pressure. And full pressure is getting to your tool...it is only the flow that is restricted. Take the regulator off the system to test your air flow and confirm a restriction at the regulator, if neccesary.
check your hose or couplers for restiction --------- try exchaging with know good ones------- the rubber seal in the female coupler may be the culprit ------------torn// deteriated// comming apart & blocking off air flow....
first I hope that you drain the water out of the tank regularly. It seems as though you might have an air hose collapsing but in any case there is something apparently restricting air flow too the gun. try opening the petcock and see if you have steady air discharge or not and if you have another air hose try it. Also, are coming directly off the compressor to the tool or do you have an oiler or drier in line? if so, eliminate the accessory. Let me know how you do....I'm curious.
On the bottom or the tank there should be a drain valve Open it, then start your compressor, allow the unit to run for 2 or 3 minutes this will dry it out
We drain the compressors in our shop daily to avoid water build up and the rust that comes with moisture Over time you can rust a tank through, which will never happen at a good time and could be dangerous
First of all we must know how is works,that is air enters the brush causing a vacuum at the paint hose,where the hose is dip into the paint barrel,so paint will fill the vacuum where it will attend the brush,so if the air mechanism in the brush is glogged air will flow in the paint barell.Solution is to dismentle the brush and clean the air mechinism
It sounds like you have a problem with the air valve. Possible deterioration of the valve material? I am not sure what they use, but if it is a rubber the cleaning thinner MAY have destroyed its properties if the cleaner got into the air path and valve.
Usually you cannot adjust the cut out pressure of the tank/motor itself, this is why they have regulators, which regulates the pressure flowing down the air lines (regulators like these dont regulate actual tank pressure cutout). To regulate air flow using the regulator knob, you actually have to have air flowing through the hose while you make the regulator/pressure adjustments as regulators regulate pressure DOWNSTREAM from the actual regulator itself.. so air flowing through is a must. Attach an air blower or something similar and let air start flowing through the hose. Now turn your regulator knob in the "-" direction to decrease regulated pressure. It is best to bring pressure all the way down to "0" first, then open the regulator up (by turning to the "+" side) and pressure will rise until you get to the desired pressure needed for the air tool in use. The tank pressure will still be between 80-125 PSI as the motor regulates and keeps the pressure in the tank between these values automatically, but your line/hose air flow pressure will remain at the regulated pressure (say 40 PSI or whatever you set using the regulator knob).