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6 308-017
OPERATION/MAINTENANCE
Pressure Relief Procedure
T
o reduce the risk of serious bodily injury
, including
fluid
injection, splashing in the eyes or on the skin, or
injury from moving parts, always follow this proce-
dure
whenever you shut of
f the pump, when check
-
ing
or servicing any
part of the spray/dispensing sys
-
tem, when installing, cleaning or changing spray
tips/nozzles, and whenever you stop spraying/dis-
pensing.
1. Engage the spray gun/dispensing valve safety
latch.
2. Shut
of
f the air to the pump.
3. Close
the bleed-type master air valve (required in
your
system).
4.
Disengage the gun/valve safety latch.
5. Hold a metal part of the gun/valve firmly to the
side
of a grounded metal pail, and trigger the gun/
valve
to relieve pressure.
6.
Engage the gun/valve safety latch.
7. Open the drain valve (required in your system)
and/or the pump bleeder valve, having a con-
tainer
ready to catch the drainage.
8. Leave
the drain valve open until you are ready
to
spray/dispense
again.
If you suspect that the spray tip/nozzle or hose is
completely clogged, or that pressure has not been
fully
relieved after following the
steps above,
VER
Y
SLOWLY
loosen the tip guard retaining nut or hose
end coupling and relieve pressure gradually , then
loosen
completely
. Now clear the tip or hose.
WARNING
Packing Nut/W
et–Cup
Fill
the packing nut/wet-cup (2)
1/3 full with Graco Throat
Seal
Liquid (TSL) or compatible solvent. See Fig. 2. Ad
-
just
the packing nut weekly so it is just snug; do not over
-
tighten. Follow the Pressure Relief Procedure W arn-
ing
above before adjusting the packing nut.
Flushing the Pump
The
pump is tested with lightweight 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 sol
-
vent
before using the pump.
For your safety, read the warning section, FIRE
OR
EXPLOSION HAZARD
on page 3 before flush
-
ing,
and follow all recommendations given there.
WARNING
Starting and Adjusting the Pump
See
the
TYPICAL INST
ALLATION
on page 4.
If you are
using
a ram or wiper plate with the pump, refer to the sep
-
arate instructions for those components for set-up and
operation
instructions.
Lower the pump into a fluid container . Be sure the air
regulator
(H)
and pump’
s bleed-type master air valve (G)
are
closed. Then open the bleed
valve (G). Hold a metal
part of the spray gun/dispensing valve (N) firmly to the
side
of
a grounded metal pail and hold the trigger open.
Now slowly open the air regulator until the pump starts.
Moving
parts can pinch or amputate your fingers or
other body parts. When the pump is operating, the
priming
piston (25) (located at the
pump intake) and
the air motor piston (located behind the air motor
plates or shield) move. See Fig. 2. Therefore,
NEVER
operate the pump with the air motor
plates
or
shield removed, and keep your fingers and hands
away
from the priming piston.
Before attempting to clear an obstruction from the
priming piston (25) or service the pump, follow the
Pressure
Relief Procedure W
arning
at left
to
pre
-
vent
the pump from starting accidentally
.
WARNING
Cycle
the pump slowly until all the air is pushed out
and
the
pump and hoses are fully primed. Release the spray
gun/dispensing
valve trigger and engage the safety
latch.
The
pump should stall against pressure when the
trigger
is
released.
If
the pump fails to prime properly
, open the bleeder valve
(35)
slightly
. Use the bleed hole (R), on the underside of
the
valve, as a priming valve until the fluid appears at the
hole.
See Fig 2. Close the bleeder valve.
NOTE: When changing fluid containers with the hose
and
gun already
primed, open the bleeder valve
(35),
to assist in priming the pump and venting air
before it enters the hose. Close the bleeder valve
when
all air has been eliminated.
To reduce the risk of fluid injection, DO NOT use
your hand or fingers to cover the bleeder hole (R)
when
priming the pump.
WARNING
With the pump and lines primed, and with adequate air
pressure and volume supplied, the pump will start and
stop
as the gun/valve is opened and closed.
Use the
air regulator (H) to control the pump speed and
the fluid pressure. Always use the lowest air pressure
necessary to get the desired results. Higher pressures
cause
premature tip/nozzle and pump wear
.
To
reduce the risk of overpressurizing your system,
which could result in component rupture and cause
serious
bodily
injury
,
NEVER exceed the specified
MAXIMUM INCOMING AIR PRESSURE to the
pump
(see the T
echnical Data on pages 24-29).
WARNING
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
(E),
which shuts of
f the air supply to the pump if the pump
accelerates
beyond the pre-set speed, is available. See
the Typical Installation on page 4 and ACCESSORIES
on
pages 22 and 23. 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.