Service And Adjustments; To Replace Or Clean Check Valve - Craftsman 919.166700 Operator's Manual

Unit cycles automatically 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 MAINTENANCE AND REPAIR OPERATIONS NOT LISTED MUST BE PERFORMED
BY TRAINED SERVICE TECHNICIAN.
Before servicing:
G
Unplug or disconnect electrical supply to the
air compressor.
G
Bleed tank of pressure.
G
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 outfit.
3. Using a phillips screwdriver remove the air filter
cover.
4. Remove the rear shroud using T-20 torx wrench.
5. Using an adjustable wrench loosen outlet tube
nut at air tank and pump. Carefully move outlet
tube away from check valve.
Outlet
Pressure
Relief
Nut

SERVICE AND ADJUSTMENTS

Nut
Chec
k
6. Using an adjustable wrench loosen pressure
relief tube nut at air tank and pressure switch.
Carefully move pressure relief tube away from
check valve.
7. Unscrew the check valve (turn counterclock-
wise) using a 7/8" open end wrench. Note the
orientation for reassembly.
8. 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
In open position
nothing is visi-
the check valve needs to be cleaned or
replaced.
9. Clean or replace the check valve. A solvent,
such as paint or varnish remover can be used to
clean the check valve.
10. Apply sealant to the check valve threads.
Reinstall the check valve (turn clockwise).
11. Replace the pressure release tube. Tighten nuts.
12. Replace the outlet tube and tighten nuts.
13. Replace the shroud and air filter.
14. Perform the Break-in Procedure. See "Break-in
Procedure" in the Operation section.
15 - SP
Screwdrive
In closed position
disc is visible.
D23012