To Replace Or Clean Check Valve - Delta 66-750 Instruction Manual

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.
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.
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 Break-in Procedure. See "Break-in Procedure" in the
Operation section.
D26269
Screwdriver
20-ENG
Outlet Tube
Pressure
Relief Tube
Nuts
In closed position
disc is visible.
Nuts
Check
Valve