OPERATION
WARNING
Pressure Relief Procedure
To reduce the risk of serious bodily injury, in-
cluding fluid injection, splashing in the eyes or on
the skin, or injury from moving parts always follow
this procedure whenever you shut off the pump,
when checking or servicing any part of the spray
system, when installing, cleaning or changing
spray tips or nozzles, and whenever you stop
spraying or dispensing.
1. Engage the gun safety latch.
2. Turn off the air to the pump.
3. Close the bleed-type master air valve (re-
quired in system).
4. Disengage the gun safety latch.
5. Hold a metal part of the gun firmly to the
side of a grounded metal pail, and trigger the
gun into the pail to relieve pressure.
6. Engage the gun safety latch.
7. Open the pump drain valve (required), hav-
ing a container ready to catch the drainage,
and leave open until you are ready to spray
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, wrap
a rag around the tip guard retaining nut or hose
end coupling and VERY SLOWLY loosen the part
to relieve pressure gradually, then loosen com-
pletely. Now clear the tip, nozzle or hose.
Flush Pump Before Using
Pumps are tested with lightweight oil which is left in to
protect the pump parts. To prevent contamination of
fluids, flush the pump with a compatible solvent before
using. If the pump is being used to supply a circulating
system, allow solvent to circulate until the system is
thoroughly flushed.
To reduce the risk of static sparking, which can
cause fire or explosion and serious bodily injury
and property damage, be sure your entire system
is properly grounded before flushing. Refer to
FIRE OR EXPLOSION HAZARD on page 3.
Remove the tip from the gun (relieve pressure
first), then hold a metal part of the gun firmly to
the side of a grounded metal pail, and use the
lowest possible pressure to flush.
MAINTAIN FIRM
METAL TO METAL
CONTACT BETWEEN
GUN AND CONTAINER
Starting and Adjusting Pump
Fill the wet-cup (45) one-half full with Grace Throat Seal
Liquid (TSL). With the drain valve and bleeder valve
closed, and the gun/valve safety disengaged, trigger
the gun/valve and slowly open the air supply valve until
the pump starts. If fluid does not flow from the trig-
gered gun/valve, open the bleeder valve (40) slightly.
See Fig 2. If fluid does not flow from the open bleeder
valve, use a hand or finger over the bleeder hole as a
priming valve. When fluid appears, close bleeder valve.
WARNING
Keep your hand and fingers away from the prim-
ing piston and fluid intake valve to reduce the risk
of serious bodily injury, including amputation.
With pump and lines primed, and with adequate air
pressure and volume supplied, the pump will start and
stop as the spray gun/valve is triggered and released. In
a circulating system, it will run continuously and speed
up or slow down as supply demands until air supply is
shut off.
Use an adequately sized air regulator (MI to control
pump speed and fluid pressure. See Typical Installation
on page 4 and ACCESSORIES. Always use the lowest
air pressure necessary to give you the results you want.
Never exceed 90 psi (6 bar) air pressure to the pump.
MAINTENANCE
Keep the wet-cup (45) filled with Grace Throat Seal Li-
quid (TSL). Check tightness of packing nut (34) weekly.
The packing nut should be tight enough to prevent
leakage-no tighter. Always shut off and relieve the air
pressure to the pump and relieve the fluid pressure
before adjusting the packing nut.
Never allow the pump to run dry of fluid being pumped.
A dry pump will quickly accelerate to a high speed,
possibly damaging itself. 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 lines, prime pump and
lines with fluid, or flush and leave filled with compatible
solvent. Be sure to eliminate all the air from fluid
system.
Shutdown and Care of Pump
For overnight shutdown, relieve the air and fluid pressure
according to the Pressure Relief Procedure, at left.
Always stop the pump at the bottom of its stroke to keep
fluid from drying on the exposed displacement rod.
Always flush the pump before the fluid dries on the rod.
If the pump is to be stored for any period of time, and
you are pumping water based fluids, first flush with
water, then with mineral spirits to protect the pump
parts.
Corrosion Protection
CAUTION
Water, or even moist air, can cause your pump to
corrode. To help prevent corrosion, NEVER leave
the pump filled with water or air. After normal
flushing, flush the pump again with mineral spirits
or oil-based solvent, relieve pressure, and leave the
mineral spirits in the pump. Be sure to follow all
steps of the Pressure Relief Procedure, at left.
306-970 5
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