Check Valve

Fixing Air Leaks

 

 

 

 

 

 

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.

Cap

Figure 17. Check valve.

3.Inspect the O-ring and diaphragm (Figure 18) for damage and dirt.

Diaphragm

O-ring

Figure 18. Check valve diaphragm and

spring.

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.

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.

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Model G0471 3 HP Air Compressor

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Grizzly G0471 instruction manual Check Valve Fixing Air Leaks, To find air leaks
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G0471 specifications

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