Graco 223954, Instructions-Parts List Manual

Page: 7 / 22

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Operation
Pressure Relief Procedure
WARNING
PRESSURIZED EQUIPMENT HAZARD
The system pressure must be manually relieved to
prevent the system from starting or spraying acci-
dentally. To reduce the risk of an injury from acci-
dental spray from the gun, splashing fluid, or
moving parts, follow the
Pressure Relief Proce-
dure whenever you:
D
are instructed to relieve the pressure,
D
stop spraying,
D
check or service any of the system equipment,
D
or install or clean the spray nozzle.
1. Shut off the air to the pump.
2. Close the bleed-type master air valve (required in
your system).
3. Hold a metal part of the dispensing valve firmly to
the side of a grounded metal pail, and trigger the
valve to relieve pressure.
4. Open the fluid drain valve (required in your sys-
tem) to relieve all fluid pressure, having a contain-
er ready to catch the drainage.
5. Leave the drain valve open until you are ready to
dispense again.
If you suspect that the nozzle or hose is completely
clogged, or that pressure has not been fully relieved
after following the steps above,
very slowly loosen the
hose end coupling and relieve pressure gradually, then
loosen completely. Now clear the nozzle or hose.
Flush the Pump Before Using
The pump was tested in lightweight oil, which was left
in to protect pump parts. To prevent contamination of
the fluid you are pumping, flush the pump with a com-
patible solvent before using it.
To flush the pump, connect a short hose to the pump
outlet, insert the pump intake into a pail of compatible
solvent, direct the hose into a pail, and start the pump
as explained at right.
Cycle the pump slowly for at least 5 minutes, then stop
and disconnect the air hose. Push up on the ball of the
intake valve (J) to drain the lower part of the pump.
See Fig. 4. Turn the pump over to drain the upper part
of the pump.
03765
Fig. 4
J
Starting and Adjusting the Pump
1. Mount the pump and connect to a fluid supply as
explained on page 5.
2. See the INSTALLATION on page 6. Be sure the
air regulator (A) and bleed-type master air valve
(D) are closed.
3. Hold a metal part of the spray gun/dispensing
valve firmly to the side of a grounded metal pail
and hold the trigger open. Then open the pump’s
bleed-type master air valve (D). Now slowly open
the air regulator (A) until the pump starts.
4. Run the pump slowly until all the air is pushed out
of the pump and hose. Always use the lowest
pressure necessary to get the desired results.
Higher pressures waste fluid and cause premature
system wear.
5. After all the air is purged, release the gun/dispens-
ing valve trigger.
In a direct supply system, the
pump will start and stop as the gun/valve is
opened and closed.
In a circulating system, the
pump will run continuously and will speed up or
slow down as supply demands, until the air supply
is shut off.
Never allow the pump to run dry of the fluid being
pumped. A dry pump will quickly accelerate to a high
speed, possibly damaging itself. If your pump acceler-
ates quickly, or is running too fast, stop it immediately
and check the fluid supply. If the supply container is
empty and air has been pumped into the lines, refill the
container and prime the pump and the lines with fluid,
or flush and leave it filled with a compatible solvent. Be
sure to eliminate all air from the fluid system.
Shutdown and Care of the Pump
For overnight shutdown, follow the Pressure Relief
Procedure Warning at left. Always stop the pump at
the bottom of the stroke to prevent the fluid from drying
on the exposed displacement rod and damaging the
throat packings.