Coupling Block - Graco 311321H Operation, Parts, Service, Repair

Coupling Block

Chemical hoses are joined to gun block by
coupling block to ease installation and removal
of gun.
Manual Valves
Two manual valves located on coupling block
control flow of each chemical component to
gun.
Triggering gun with manual valves closed
may cause crossover if any residual chem-
ical remains in gun ports.
Never open manual valve unless coupling
block is secured to gun or unless you point
gun into waste container.
Open Manual Valves
Use 5/16 in. nut driver to turn manual valve
counterclockwise three full turns.
Coupling
Block
Manual Valves
F . 14: Open Manual Valves
IG
311321H
Close Manual Valves
Use 5/16 in. nut driver to turn manual valve
fully clockwise.
CAUTION
To prevent accidental gun operation, always
set safety stop to CLOSED (SERVICE),
close both manual valves, and disconnect air
supply.
Installation and Removal
To prevent release of pressurized chemicals,
close both manual valves before removing
coupling block.
Install Coupling Block
1. Replace nicked, damaged, or worn cou-
pling block gaskets.
2. With gaskets in place, fit coupling block to
gun block.
Operation Basics
13