Graco 237-004 Instructions-Parts List Manual page 9

WARNING
Moving parts can pinch or amputate your fingers or
other body parts. When air is supplied to the motor,
the air motor piston (located behind the air motor
shield) moves. Therefore, NEVER operate the
pump with the air motor shield removed.
Flush the Pump Before Using
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 8.
The pump is tested with lightweight oil, which is left in to
protect the pump parts. If the fluid you are pumping may
be contaminated by the oil, flush out the oil with a compat-
ible solvent before using the pump. If the pump is being
used to supply a circulating system, allow the solvent to
circulate until the fluid lines are thoroughly flushed.
WARNING
For your safety, read the warning section, FIRE
AND EXPLOSION HAZARD on page 4 before
flushing, and follow all recommendations given
there.
Daily System Startup, Circulating Supply Systems
NOTE: Be sure the wet–cup is 1/2 full with Graco Throat
Seal Liquid or compatible solvent.
1. If you are using an agitator, turn it on and thor-
oughly mix the coating fluid.
2. Be sure the bleed–type master air valves (C), the
air regulator (D), and the fluid drain valves (G) are
closed, and the shutoff valves (J), fluid pressure
regulators (K), and back pressure regulators (M)
are open.
Operation
3. Place the suction tube (Q) in the fluid supply.
4. Open the bleed–type master air valves (C).
To reduce the risk of splashing and static sparking,
maintain firm metal-to-metal contact between the
gun and a grounded metal pail when priming the
pump.
5. If there IS solvent in the system:
a. Turn the director valve (N) to circulate.
b. Disconnect the return line from the director
valve, and place it in a large waste container.
c. Open the pump air regulator slowly, just until the
pump is running slowly and smoothly. Watch for
coating fluid to come from the return line, and
then quickly shut off the pump. Cap the hose end
with a high pressure plug or cap.
d. With no tip installed, unlock the gun trigger safe-
ty. Hold the trigger open and restart the pump.
Watch for coating fluid to appear at the gun, and
then quickly release the trigger . Lock the gun
trigger safety. Repeat for all gun stations.
e. Reinstall the return line.
6. If there IS NO solvent in the system:
a. Turn the director valve (N) to circulate.
b. With no tip installed, unlock the gun trigger safe-
ty. Trigger the gun into a container and slowly
open the pump air regulator, just until the pump is
running slowly and smoothly . Allow the fluid to
purge air from the gun line hose, then release the
trigger and lock the gun trigger safety. Repeat for
all gun stations.
c. Allow the pump to circulate fluid slowly and
purge all air from the return line.
WARNING
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