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10 308118
Operation
Starting and Adjusting the Pump
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 9.
See the Typical Installation on page 6. Be sure the
air regulator (E) and bleed-type master air valve (D)
are closed. Do not install the spray tip yet.
Mount the pump on the supply drum. On bung-style
drums, open the vent plug to prevent a vacuum from
forming in the drum. Hold a metal part of the spray gun
(M) 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
until the pump starts, about 40 psi (280 kPa, 2.8 bar).
Cycle the pump slowly until the air is pushed out and
the pump and hoses are fully primed. Release the
spray gun trigger and engage the safety latch. The
pump should stall against pressure when the trigger is
released.
Relieve the pressure, then install the spray tip in the
gun.
With the pump and lines primed, and with adequate air
pressure and volume supplied, the pump will start and
stop as the spray gun 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.
Use an adequately sized air regulator (E) to control the
pump speed and the fluid pressure. Always use the
lowest air pressure necessary to get the desired
results. Higher pressures waste fluid and cause pre-
mature wear of the packings and spray tip.
WARNING
To reduce the risk of overpressurizing your system,
which could result in component rupture and cause
serious injury, never exceed the Maximum Incom-
ing Air Pressure given on your pump or in the
Technical Data on pages 22 and 24.
Keep the packing nut/wet-cup (14) filled with Graco
Throat Seal Liquid (TSL) or compatible solvent, to help
prolong the packing life. Adjust the packing nut weekly
so it is just tight enough to prevent leakage; do not
overtighten. See Fig. 2. Always relieve the pressure
before adjusting the packing nut.
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. A pump runaway
valve (B), which shuts off the air supply to the pump if
the pump accelerates beyond the pre-set speed, is
available. If your pump accelerates quickly, or is run-
ning 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
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 9.
For overnight shutdown, relieve the pressure. 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.
Always flush the pump before the fluid dries on the
displacement rod. Relieve the pressure after flushing.