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NOTE: Flush the pump before using it for the first time
to remove the lightweight oil which is left in the pump
after factory testing it. The oil protects the pump from
corrosion. Be sure the solvent used is compatible with
the fluid to be sprayed, and with the wetted parts of the
pump. Refer to the Technical Data on page 11 and in
the separate displacement pump manual for the
wetted parts.
Pressure Relief Procedure
WARNING
PRESSURIZED EQUIPMENT HAZARD
The system pressure must be manually
relieved to prevent the system from
starting or spraying accidentally. Fluid
under high pressure can be injected through the
skin and cause serious injury. To reduce the risk of
an injury from injection, splashing fluid, or moving
parts, follow the Pressure Relief Procedure
whenever you:
are instructed to relieve the pressure,
stop spraying,
check or service any of the system equipment,
or install or clean the spray tips.
1. Shut off the air to the pump.
2. Close the bleed-type master air valve (required in
your system).
3. Hold a metal part of the gun to the side of a
grounded metal pail and trigger the gun to relieve
pressure.
4. Open the fluid drain valve (required in your sys-
tem), having a container ready to catch the drain-
age.
If you suspect that the spray tip or hose is clogged or
that fluid pressure is not fully relieved after following
the steps above, very slowly loosen the tip guard
retaining nut or hose end coupling and relieve pressure
gradually. Clear the tip or hose obstruction.
Operation
Check Valve Adjustment
The fluid piston and intake valve are factory set for
high-volume pumping of heavy, spray-viscosity fluids.
To adjust the check valves, refer to the Operation
section in the separate displacement pump manual.
Starting and Adjusting the Pump
NOTE: If the pump is not immersed in fluid, fill the
wet-cup (M) 1/2 full with Graco Throat Seal Liquid
(TSL) or a compatible solvent.
1. Open the bleed-type master air valve.
2. Open the spray gun or dispensing valve.
3. Slowly open the air regulator until the pump is
running at about 40 psi (3 bar, 300 KPa) air pres-
sure. Run the pump slowly until all the air is
pushed out of the lines and fluid is flowing smooth-
ly. Close the spray gun or dispensing valve; the
pump will stall.
NOTE: In a direct supply system, the pump starts and
stops automatically when the spray gun or dispensing
valve is opened or closed, if the pump is supplied with
sufficient air pressure and air volume.
In a circulating system, the pump runs continuously,
speeding up or slowing down as the spray gun or
dispensing valve is opened and closed, until the air
supply is shut off.
Lubrication
1. For automatic air motor lubrication, install an air
line lubricator. Refer to step 4 of installation. Lu-
brication helps keep the motor running smoothly
and prolongs its life.
2. Keep the displacement pump wet-cup 1/2 full with
TSL or a compatible solvent. This prolongs the life
of the displacement pump packings.
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