To Replace or Clean Check Valve
1.Release all air pressure from air tank. See "To Drain Tank" in the Maintenance section.
2.Unplug unit.
3.Using an adjustable wrench loosen outlet tube nut at air tank and pump. Carefully move outlet tube away from check valve.
4.Using an adjustable wrench loosen pressure relief tube nut at air tank and pressure switch. Carefully move pressure relief tube away from check valve.
5.Unscrew the check valve (turn counterclockwise) using a 7/8" open end wrench. Note the orientation for reassembly.
Outlet Tube
Pressure
Relief Tube
Nuts
Nuts 
Check Valve
6.Using a screwdriver, carefully push the valve disc up and down. NOTE: The valve disc should move freely up and down on a spring which holds the valve disc in the closed position, if not the check valve needs to be cleaned or replaced.
Screwdriver | In closed position |
| disc is visible. |
In open position nothing is visible.
7.Clean or replace the check valve. A solvent, such as paint or varnish remover can be used to clean the check valve.
8.Apply sealant to the check valve threads. Reinstall the check valve (turn clockwise).
9.Replace the pressure release tube. Tighten nuts.
10.Replace the outlet tube and tighten nuts.
11.Perform the
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