Service And Adjustments - Craftsman 919.167812 Owner's Manual

ALL MAINTENANCE AND REPAIR
OPERATIONS NOT LISTED MUST BE
PERFORMED BY TRAINED SERVICE
TECHNICIAN.
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. Turn air compressor off, lock out
the power supply, and relieve all
air pressure from the air tank.
3. Using an adjustable wrench loos-
en outlet tube nut at air tank and
pump. Carefully move outlet tube
away from 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.
N004035

SERVICE AND ADJUSTMENTS

Risk of Unsafe
Operation. Unit
in open
position
nothing 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 tight-
en nuts.
11. Perform the Break-in Procedure.
See "Break-in Procedure" in the
Operation section.
ADDITIONAL SERVICE
Disassembly or service of the air
compressor beyond what is covered
in this manual is not recommended.
If additional service is required, con-
tact your nearest Authorized Warranty
Service Center.
20-ENG
Screwdriver
In closed position
disc is visible.