Manual Valves; Coupling Block - Graco GX-7A Instructions Manual

Operation

Manual Valves

NOTE: Triggering the gun with the manual valves (C)
closed may cause crossover if the gun ports contain
residual chemical.
Closing the manual valves (C) prevents chemicals in
heated hoses from entering the gun. Close the manual
valves before servicing gun.
Never open manual valves (C) unless coupling block
(J) is secured to gun or exit port is directed into flush
pail.
To open the manual valves (C): Use a 5/16 in. nut
driver to turn the manual valve counterclockwise three
full turns. Do not open until it bottoms out.
To close the manual valves (C): turn the manual
valves clockwise until tight.
J
C
F . 11 Manual Valves
IG
16

Coupling Block

Chemical hoses are joined to the gun block (B) by the
coupling block (J) to ease installation and removal of
the gun.
B
ZAA
J
C
F . 12 Coupling Block
IG
Install Coupling Block
1. Inspect the coupling block (J) gaskets for damage
and wear. Replace if necessary.
2. With gaskets in place, fit the coupling block (J) to
the gun block (B).
3. Insert the coupling block (J) mounting screw and
tighten securely with a 5/16 in. nut driver.
Remove Coupling Block
To prevent release of pressurized chemical, close
both manual valves (C) before removing coupling
block (J).
1. Set the safety lock (H) to CLOSED (SERVICE).
2. Disconnect the air hose.
3. Close both manual valves (C).
4. Remove the coupling block (J) mounting screw.
5. Separate the coupling block (J) from the gun.
6. Wipe the mating surfaces of the gun block (B) and
coupling block (J) to remove residual chemical.
7. Cover exposed openings with grease.
H
ZAR
311321W