Graco 223843, Instructions Manual

Page: 10 / 24

10 308106
Operation
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
plates) moves. See Fig. 2. Therefore, never oper-
ate the pump with the air motor plates removed.
Flush the Pump Before Using
The pump is tested with lightweight motor oil, which is
left in to protect the pump parts. If the fluid you are
using may be contaminated by the oil, flush it out with
a compatible solvent before using the pump. If the
pump is being used to supply a circulating system,
allow the solvent to circulate until the pump is thor-
oughly flushed.
WARNING
FIRE AND EXPLOSION HAZARD
Before operating the pump, ground the
system as explained in Grounding on
page 6. Also read the section FIRE
AND EXPLOSION HAZARD on page
4.
Starting and Adjusting the Pump
See the Typical Installation on page 7. Be sure the
air regulator (E) and bleed--type master air valve (D)
are closed. DO NOT INSTALL THE SPRAY TIP YET!
Connect a suction hose (N) to the pump’s fluid inlet.
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 all 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.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 9.
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 pump 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 20 and 21.
Keep the packing nut/wet--cup (4) 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. See the Typical Installation on page 7. If
your pump accelerates 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.