SERVICE AND ADJUSTMENTS
Unit cycles auto- matically when
power is on. When doing Maintenance, you may be exposed to voltage sources, compressed air or moving parts. Personal injuries can occur. Before performing any Maintenance or repair, unplug the compressor and bleed off all air pressure.
ALL SERVICE AND REPAIR OPERA- TIONS NOT DESCRIBED IN THIS MANUAL MUST BE PERFORMED BY A TRAINED SERVICE TECHNI- CIAN.
Before servicing:
•Unplug or disconnect electrical supply to the air compressor.
•Bleed tank of pressure.
•Allow the air compressor to cool.
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.
Outlet Tube
Pressure
Relief Tube
Nuts
Nuts 
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 ori- entation 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 moving freely the check valve needs to be cleaned or replaced.
Screwdriver
In open position nothing is visible.
In closed position disc is visible.
7.Clean or replace the check valve. A solvent, such as paint or var- nish 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
D24910 | 20- ENG |