Flush Gun; Initial Set Up - Graco GX-7A Instructions Manual

Operation

Flush Gun

To avoid fire and explosion, always ground equipment
and waste container. To avoid static sparking and
injury from splashing, always flush at the lowest
possible pressure.
1. Set the safety lock (H) to CLOSED (SERVICE).
H
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2. Close both manual valves (C).
C
3. Loosen the R-screen screw (Y) and then remove by
hand.
4. Use a flush can to thoroughly flush the screen screw
and screen screw cavity.
5. Loosen the A-Screen screw (ZAJ) and then remove
by hand.
6. Use a flush can to thoroughly flush the screen screw
and screen screw cavity.
7. Service the gun by following Maintenance
procedures, page 24.
18
CLOSED (SERVICE)
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Initial Set Up

1. Remove the coupling block (J) from the gun. Follow
Remove Coupling Block, page 16.
2. Install the female quick disconnect fitting to the air
supply hose bundled with the chemical supply
hoses.
3. Connect A-isocyanate hose (red-taped) to the
notched fitting on coupling block (J). Then connect
B-resin hose (blue-taped) to the fitting without
notches on coupling block.
4. Close both manual valves (C).
C
5. Pressurize the A and B chemical hoses and check
for leaks. (Refer to your proportioning system
manual.)
6. Bleed air from chemical hoses.
a. Use separate waste containers for A-ISO and
B-Resin.
b. Hold the coupling block (J) with exit ports
pointed into waste container.
c. Open the manual valves (C) one at a time to
dispense into waste container.
d. Bleed each side until chemical leaving hoses is
free of air.
e. Close both manual valves (C).
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