Graco GH 733 HYDRA-SPRAY Instructions-Parts List Manual page 5

Prepare the Material end Prime the Pump
Prepare your material according to the manufacturer's
instructions.
Place the displacement pump or the suction tube into
the material supply container. Install a spray tip in the
gun
(see
the gun instru,ct#on manual), and start the
engine. Trigger the gun Into
a
metal waste container,
holding a metal part.of the gun firmly against the metal
container. Refer to Fig
5.
Hold the gun trigger open until
all air
is
forced out of the system. Release the trigger,
engage the trigger safety, and let the pump stall.
NOTE:
The GH 733 can be tilted backwards and will
support itself while placing
a 5
gallon pail
under the material pump.
Adjusting the Pressure
Turn the pressure control knob IF) to adjust the fluid
pressure. See Fig 6. Turn the knob clockwise t o in-
crease the pressure and counterclockwise to decrease
to completely atomize the material. Check the spray
the pressure. Always use the lowest pressure necessary
pattern. The tip size and angle determines the panern
width and flow rate. Don't
try
to get more coverage by
increasing the pressure; use a larger tip instead. See the
separate instruction manual
306-997
for the correct
method'of airless spraying.
-H
-
:leaning a Clogged Tip
Pressure Relief Procedure
WARNING
Always relieve system pressure whenever you are
done spraying for a while and before installing,
removing or cleaning any parts to avoid possible
injury from high pressure fluid in the system.
Always follow this procedure: shut off the engine
by depressing the stop bunon ( J ) , trigger the
spray gun, engage the trigger safety, close the
engine fuel cock
(E),
and slowly open the dram
valve (143). Leave the drain valve open until you
are ready to use the unit again.
Clean out the front of the tip frequently during the day's
operation with a solvent soaked brush. This helps to
prevent material build up and tip clogging.
If the spray tip clogs while spraying, follow the Pressure
Relief Procedure, above. Loosen the tip guard slowly
before removing
it
completely. Remove the tip and put
it and the nozzle of the gun in solvent. Let the tip soak
long enough to dissolve the obstruction, or blow
it
out
with air through the front of the'tip. If the air and sol-
vent does not loosen the obstruction, tap the back of
the tip against a flat surface to jar it out.
Shutdown and Care
pressure according to the Pressure Relief Procedure,
If you stop spraying for a short time, relieve system
the gun and the tip in solvent.
above. Remove the tip from the gun. Place the nozzle of
overnight in the unit, and for weekend or longer shut-
Flush the unit if the material you are pumping will dry
downs. Flush the unit with a compatible solvent, then
leave mineral spirits in the pump during storage to help
prevent corrosion of material pump.
Whenever
it
is possible, park the unit in the shade or in a
relatively cool area to reduce the possibility of
overheating.
Remove and clean the gun tip at least twice a day when
spraying. Always stop the pump at the bonom of its
stroke when you are through spraying for the day.
periodically and tighten
it
if necessary. Refer to Fig
9 .
Check the tightness
of
the wet-cuplpacking nut (106)
page 10. The nut should be tight enough
to
stop
leakage, but no tighter. Always relieve the system
pressure according to the Pressure Relief Procedure
(see above) before adjusting the packing nut.
Check the hydraulic oil level occasionally. Unscrew the
cap of the intake filter
(9);
there should be 1 in.
(25
mm)
of oil visible in the bottom of the filter screen. Refer to
Fig 7, page 7. Use Graco-approved oil only. See AC-
CESSORIES.
the filter after every 500 hours of operation or every 6
Inspect the return line filter
(3)
frequently, and replace
months, whichever comes first. Refer to Fig 7, page 7.
A clogged filter can cause the cooler to leak or to fail.
6
307-465