Craftsman 919.166442 owner manual Service and Adjustments, To Replace or Clean Check Valve

SERVICE AND ADJUSTMENTS

All maintenance and repair operations 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, compressed air, or moving parts. Before servicing unit unplug or disconnect electrical supply to the air compressor, bleed tank of pressure, 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.Loosen the nut on the outlet tube and move the outlet tube to the side.

Outlet Tube

Nut

Check

Valve

4.Loosen the nut on the outlet tube and move the outlet tube to the side.

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.

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 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.

A13640 16- ENG