A compressor that will not build lasting pressure is useless.
Without the ability to control the flow and pressure of air, it cannot drive
tools or run machines. There are two possible causes for a compressor that
runs, but does not build up pressure. The limiter switch may need to be
adjusted, or there is an air leak that needs to be fixed. If you find that your
tank itself is damaged, consult professional help to prevent harmful tank
explosions.
Instructions
Disengage all
tools and hoses. Turn the compressor on and spray a solution of soap and water
over the connections between the air compressor and its fittings. Look for
bubbles to appear in the solution, indicating an air leak. Turn the compressor
off and pull the release valve, a plastic and metal valve with a pull ring in
it, to release the pressure from the tank.
Remove any
fittings that had bubbles around them. Turn the fitting counterclockwise with a
wrench to remove it. Wrap Teflon around the threads of the fittings and
re-thread them, tightening the fittings with the wrench by turning them
clockwise.
Test the
compressor to see if the pressure is sufficient. If not, remove the cover from
the pressure-limiting switch and turn the upper limiting screw clockwise to
tighten, raising the upper pressure limit, so that the tank can fill more
fully. Use a screwdriver to turn the screw.
Bleed the water
from the tank by turning the compressor on and allowing it to fill as much as
possible. Locate the bleeder valve on the underside of the tank. Grip it with
locking pliers and turn it counterclockwise to release the valve, allowing the
condensation to be blown out with the air from the tank. Once the condensation
stops dripping, turn the valve clockwise to close it. Charge and retest the
compressor.
