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Model G0471 3 HP Air Compressor
-22-
Fixing Air Leaks
Air leaks will cause low air output and
increase the time the compressor must
run.
To find air leaks:
1. Turn the compressor OFF when the
tank is fully pressurized and unplug the
compressor.
2. Listen for the sound of air to find fittings
that may be leaking.
3. Spray the suspected air leak with a
soap and water solution. If you see air
bubbles, you have found your leak.
To fix air leaking around fitting threads:
1. Unplug the air compressor and drain
all the air from the tank.
2. Unscrew the fitting that is leaking. Clean
and wrap teflon tape and/or spread pipe
dope on the threads.
3. Re-install the fitting to the compressor.
To fix air leaking through a valve:
1. Unplug the air compressor and drain
all the air from the tank.
2. Remove the valve, clean it thoroughly,
then re-install with teflon tape and/or
pipe dope.
3. If the valve continues to leak, replace it
with a new valve.
Figure 18. Check valve diaphragm and
spring.
Diaphragm
O-ring
3. Inspect the O-ring and diaphragm
(Figure 18) for damage and dirt.
4. Clean dirt off of the diaphragm and O-
ring and replace any damaged parts.
5. Re-assemble the check valve. Make
sure the diaphragm presses squarely
against the air supply tube opening.
Check Valve
The diaphragm and O-ring in the check
valve can become damaged, twisted, or
dirty and cause the check valve or pres-
sure switch to leak air.
To fix the check valve:
1. Unplug the air compressor and drain
all the air from the tank.
2. Remove the cap from the check valve
shown in Figure 17.
Figure 17. Check valve.
Cap