SERVICE AND ADJUSTMENTS
All maintenance and repair opera- tions not listed must be performed by Trained Service Technician.
Risk of Unsafe
Operation. Unit
cycles automatically when power is on. When servicing, you may be exposed to voltage sources, com- pressed air, or moving parts.
Before servicing unit unplug or dis- connect electrical supply to the air compressor, bleed tank of pres- sure, and 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.Set the On/Auto/Off lever to “OFF” and unplug unit.
3.Using an adjustable wrench loosen outlet tube nut at air tank and pump. Carefully move outlet tube away from check valve.
Pressure |
|
Relief Tube | Nut |
Outlet
Tube 
Nut 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 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
17- ENG | D28071 |