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OPERATION
-ARNING
To reduce the risk of serious bodily injury, in-
the skin, or injuh from moving parts, always
cluding fluid injection, splashing in the eyes or on
follow the Pressure Relief Procedure on page 2
when checking or servicing any part of the spray
spray tips, and whenever you stop spraying.
system. when installing, cleaning or changing
Flush the Pump Before Using
Pumps are tested with light weight motor oil which is
left in to protect the pump parts. To prevent contamine-
tion of the fluid, flush the pump with a compatible sol-
vent before using it. If the pump is baing used to supply
a circulating system, allow the solvent to circulate until
the pump is thoroughly flushed.
WARNING
Before flushing,
be sure the entire system and
flushing pails are properly grounded. Refer to
Grounding on page
3.
Follow the Pressure
Relief Procedure on page 2, and remove the
spray rip from h e gun.
Always use the lowest
to-metal contact between the gun and the pail
possible fluid pressure, and maintain firm matal-
during flushing
to
reduce the risk of fluid injection
injury, static sparking and splashing.
" - .
Trigger the spray gun and slowly open the air supply
Starting end Adjuatlng Pump
valve until the pump
starts,
about
40
psi
(3
bar). Allow
the pump to cycle slowly until all the air is pushed out of
the lines. Release the trigger; the pump will stall against
the pressure.
With the pump and lines primed, and with adequate air
pressure and volume supplied, the pump will start end
stop as the spray gun is triggered and released.
In e cir-
slow down as supply demands until the air supply is
culating system,
it
will run continuously and speed up or
shut off.
U s e
an adequately sized sir regulator to control the
pump speed.and fluid pressure. See ACCESSORIES,
page 13. Always use the lowest air pressure necessary
to obtain the desired results. Higher pressures waste
fluid and cause premature wear of the pump packings
and spray tip.
quid (TSL) to help prolong the packing life. Check the
Keep the wet-cup
( 3 6 1
filled with Graco Throat Seal Li-
tightness of the packing nut (36) weekly. The packing
tighter. Sea Fig 2. Always follow the Pressure Relief
nut should be tight enough to prevent leakage-no
Procedure on page 2 before adjusting the packing nut.
pumped. A dry pump will quickly accelerate to a high
Never allow the pump to run dry of the fluid being
speed, possibly damaging itself. (A pump runaway
valve automatically alerts you to this problem, see IN-
STALLATION.) If your pump accalerates quickly, or is
supply. If the supply container is empty and air
has
been
running too fast, stop
it
immediately and check the fluid
pumped into the lines, refill the supply container and
prime the pump and lines with fluid, being sure to
eliminate all air from fluid system, or flush the pump as
described in "Shutdown and Care", below.
Shutdown and
Care
of Pump
Always follow the Pressure Relief Procedure, on
page 2, whenever you shut off the pump. Stop the
pump at the bottom of i t s stroke to keep fluid from dry-
ing on the exposed displacement rod and damaging
throat packings.
Always flush the pump with a compatible solvent before
the fluid can dry on the displacement rod. At
the
end
of
each day,
if
you ara pumping water basad fluid, first
flush with water, then with mineral spirits to protect the
spirits in the pump to prevent corrosion.
pump parts. Relieve pressure and leave the mineral
306-981
6
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