Graco GX-8 Operation, Parts, Service, Repair page 9

Close Manual Valves
Use 5/16 in. nut driver to turn manual valve
fully counterclockwise.
CAUTION
To prevent accidental gun operation, always
set safety stop to CLOSED, close both man-
ual valves, and disconnect air supply.
Installation and Removal
To prevent release of pressurized chemicals,
close both manual valves before coupling
block is removed.
Install Coupling Block
1. Replace nicked, damaged, or worn cou-
pling block gaskets.
2. Ensure A-(isocyanate) and B-(resin) check
valves are inserted into their proper
recesses in gun block. Isocyanate valve is
notched for easy identification.
311338B
3. Fit coupling block into gun block and insert
coupling block mounting screw. Use 5/16
in. nut driver to tighten to gun block.
B-Check
Valve
A-Check
Valve
Coupling Block
Gaskets
Coupling Screw
Mounting Screw
F . 8: Install Coupling Block
IG
Remove Coupling Block
1. CLOSE safety stop.
2. Disconnect air hose.
3. Close both manual valves.
4. Remove coupling block mounting screw.
5. Separate coupling block from gun.
6. Wipe mating surfaces of gun block and
coupling block to remove residual chemi-
cals.
7. Cover exposed openings with grease.
To avoid accidental gun operation, ensure
coupling block manual valves are closed
before attempting to service gun, or any
time gun is not in use.
Operation Basics
9