Graco GX-7A Instructions Manual page 27

9. Set the safety lock (H) to OPEN. Depress and
release the gun trigger (D) to unseat it. Remove the
mixing module (ZAH) off end of the valving rod (N).
Set the safety lock to CLOSED (SERVICE).
NOTICE
Do not use sharp objects or metal tools to remove
mixing module (ZAH).
10. Loosen the rear packing nut (E) 1-2 turns.
11. Push the safety lock (H) partially forward, rotate it
counterclockwise, and slide off the air cylinder.
12. Remove the valving rod (N).
a. Depress the trigger (D) lever and hold.
b. GX-7 DI model only: loosen the piston stop
locknut until it disengages from thread on the
valving rod (N).
c. Use a 5/16 in. nut driver to unthread the valving
rod (N) from the rear of gun.
d. When threads disengage remove assembly by
hand.
DB
N
F . 18 Remove Valving Rod (GX-7 DI model)
IG
N
F . 19 Remove Valving Rod (GX-7A and GX-7 400
IG
models)
311321W
13. Inspect the valving rod (N) for damage and replace
as required. Clean and remove any buildup of
mixed material from the rod using cloth soaked in
gun cleaner or fine steel wool.
NOTE: If the valving rod (N) is replaced, it is
recommended to reset the forward stop. See Adjust
Valving Rod, page 23.
14. Disconnect the air supply.
15. Remove the gun block (B) retaining screw. Carefully
slide the gun block away from the air cylinder. If
dried chemical is built up on the gun block, remove
dried chemical before you remove the gun block.
16. Clean all components thoroughly. Use brushes and
clean-out tools to remove residual chemical from
metal components. Use cotton swabs soaked in
gun cleaner to clean plastic components.
17. Coat threads and mating surfaces of the gun block
(B) and the gun block bracket with Lubriplate
grease, and reassemble.
18. Insect the gun block (B) for damage.
H
H
Repair
27