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21- ENG
D23766
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 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
moving freely 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 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.
SERVICE AND ADJUSTMENTS
To Replace or Clean Check
Valve
1. Release all air pressure from air
tank. See "To Drain Tank" in the
Maintenance section.
2. Unplug unit.
3. Using an adjustable wrench,
loosen outlet tube nut at air tank
and pump. Carefully move outlet
tube away from check valve.
Outlet Tube
Nuts
Nuts
Pressure
Relief Tube
Check
Valve
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 SERVICE AND REPAIR
OPERATIONS NOT DESCRIBED IN
THIS MANUAL MUST BE
PERFORMED BY A TRAINED
SERVICE TECHNICIAN.
Before servicing:
• Unplug or disconnect electrical
supply to the air compressor.
• Bleed tank of pressure.
• Allow the air compressor to
cool.
In closed position
disc is visible.
In open
position
nothing is
visible.
Screwdriver