Porter-Cable C7501M - Manual (Page 18)

18 - ENG N020206
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, com-
pressed air, or moving parts. Before servicing unit unplug or disconnect elec-
trical 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 pres-
sure from the air tank.
3. Using an adjustable wrench loosen outlet tube nut at air tank and pump.
Carefully move outlet tube away from check valve.
Nut
Pressure
Relief
Tube
Check
Valve
Nut
Outlet
Tube
Nuts
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 orientation for reassembly.
6. Using a screwdriver, carefully push
In closed position
disc is visible.
In open
position
nothing is
visible.
Screwdriver
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.
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 clock-
wise).
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.