OPERATION
WARNING
in the
eyes,
or injury
To reduce the risk of serious bodily injury,
from moving parts,. always follow the Pressure
off
the pump, when checking or servicing any part
Relief
Procedure on page
whenever you shut
of
sprayldispensing system,
installing,
whenever you stop spraying.
cleaning or changing spray tips or
and
Fill the wet-cup
one-half full with Graco Throat
Seal
Liquid
The pump is tested with No.
10
motor oil, which is
left
Flush
the Pump
in to protect
pump parts.
If the fluid you are using
patible solvent before using the pump.
may
be
contaminated
by
the oil, flush
it
out with
a
WARNING
For
your
safety,
read the warning section,
FIRE
flushing, and follow
all
the recommendations
OR
EXPLOSION. HAZARD on
before
given there.
Start and
the Pump
Be
sure the air regulator
is closed. Then open the
bleed-type master air valve
Hold
a
metal part of the
gun firmly to the side of a grounded metal pail and hold
the trigger open. Now slowly open the air regulator until
the pump starts.
See
the Typical Installation.
the pump and hoses are fully primed. Release the gun
Cycle
pump slowly until
all
the air is pushed out and
trigger and engage the safety latch. The pump will stall
against pressure when the trigger
is
released.
WARNING
Moving parts can pinch or amputate your fingers
or other body parts. When the pump
is
operating,
the priming piston
(located at the pump in-
taka) and
air motor piston (located behind the
air motor plates) move. Therefore, NEVER
operate the pump with the
air motor
remov-
ed, and keep your fingers and hands away from
the priming piston.
priming piston
or service the pump, follow the
Before attempting to clear an obstructon from the
Pressure
Relief
Procedure on page
to prevent
the pump from starting accidentally.
I
valve
slightly.
Use
the bleeder hole
as
a
If
the pump fails to prime properly, open the bleeder
ing valve until the fluid appears
at
the hole.
Close the bleeder valve.
WARNING
'your hand or fingers to cover the bleeder hole
To reduce the risk of fluid injection,
DO
NOT use
when priming
pump.
With the pump and lines primed, and with adequate air
stop
as
spray gunldispensing valve is opened and
pressure and volume supplied,
pump will start and
closed.
Fig
2
fluid pressure. Always use the lowest air pressure
Use
the air regulator to control the pump speed and
necessary to get the desired results. Higher pressures
cause premature
and pump wear.
To reduce
the
of overpressurizing your
system, which could result
in
component rupture
and causa serious bodily injury. NEVER exceed
7
bar
MAXIMUM INCOMING AIR
PRESSURE
to the pump.
Keep the wet-cup
one-half
full
with
No
adjustment is necessary to the packing nut
to the
packing design.
pumped. A dry pump will quickly accelerate to
a
high
allow the pump to run dry of the fluid being
which shuts
the air supply to the pump
if the pump
speed, possibly damaging itself. A pump runaway valve,
accelerates beyond
preset speed, is available.
See
ACCESSORIES on page 17. If your pump accelerates
quickly, or is running too fast, stop it immediately and
check the fluid supply. If the supply container is empty
tainer and prime
pump and the
with fluid, or
and air has bean pumped into the lines, refill the
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
shutdown, follow the Pressure
Relief
Pro-
cedure, above. Always stop the pump
at
the bottom of
stroke to prevent the fluid from drying on the exposed
displacement rod and damaging the throat packings.
Always flush
pump before the fluid dries on the
displacement rod. Never leave water or water-based
fluid in the pump overnight. First, flush with water or a
the pressure, but leave the mineral spirits in the pump to
compatible
then with mineral spirits. Relieve
protect the parts from corrosion.
5
