Craftsman 919.167551 owner manual Service and Adjustments, To Replace Check Valve

SERVICE AND ADJUSTMENTS

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.

ALL MAINTENANCE AND REPAIR OPERATIONS NOT LISTED MUST

5.Unscrew the check valve (turn counter- clock- wise) using a 7/8" open end wrench.

Outlet

Tube

Nuts

Check

Valve

BE PERFORMED BY TRAINED SERVICE TECHNICIAN.

To Replace Check Valve

1.Release all air pressure from air tank. See To Drain Tank in the Maintenance section.

2.Unplug outfit.

3.Remove the shroud on the outlet tube side. NOTE: Remove screw with T-20 Torx screwdriver and loosen all the tabs on the shroud with a flat screwdriver before removing.

4.Using an adjustable wrench, loos- en outlet tube nut at air tank and pump head. Carefully move outlet tube away from check valve.

6.Using a screwdriver, carefully push the valve disc up and down.

Screwdriver

In open position nothing is visible.

In closed position disc is visible.

NOTE: The valve disc should move freely up and down on a spring which holds the valve disc in the closed posi- tion; if not the check valve needs to be replaced.

7.Install the new check valve (turn clockwise).

8.Replace the outlet tube and tight- en nuts.

9.Replace the shroud.

16- ENG­