Which i ve never seen done on any compressor tank.
Compressor drain valve leaking.
How to fix it.
Makita mac700 air compressor.
If the check valve is now.
You can try to clean out the old one.
Clean the regulator 4.
Drain the air tank from the drain valve.
Product links below in order of appearance.
The valve on the outside of the pressure switch may look something like the one in the image.
Clean the regulator body air piston spring and cap with wd40.
Unloader valve is leaking air when the air compressor reaches the normal cut out pressure and stops but you notice while the air compressor is off that air is leaking out of a valve attached to or perhaps inside of the air compressor pressure switch.
They usually use a high strength thread locker on the drain valves so it may just be very very hard to remove.
Http amzn to 2ir0elq pittsburgh forge 12 piece screw extractor.
Besides the drain valve is relatively easy and inexpensive to fix.
To fix the air leak caused by a faulty drain valve there are three choices.
1 unplug the compressor 2 drain all the air from the tank 3 remove the lines connected to the tank check valve 4 remove the tank check valve inspect clean re install the same one or install a new one 5 reassemble and test the compressor operation.
After cleaning replace the parts.
Turn off and unplug the air compressor.