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WARNING
Before performing this procedure, follow the Pres-
sure Relief Procedure on page 5. Disconnect all
hoses from the pump.
WARNING
For your safety, before operating the equipment be
sure all operators have read and fully understand all
the warnings, cautions and instructions in this manu-
al and all manuals supplied with each component or
accessory.
Flush the Pump Before Using
Pumps are tested with lightweight oil which is left in to
protect the pump parts. To prevent contamination of the
fluid, flush the pump with a compatible solvent before us-
ing it.
WARNING
Before flushing, be sure the entire system and flush-
ing pails are properly grounded. Refer to Grounding
on page 3. Follow the Pressure Relief Procedure
Warning on page 5, and remove the spray tip from
the gun. Always use the lowest possible fluid pres-
sure, and maintain firm metal-to-metal contact be-
tween the gun and the pail during flushing to reduce
the risk of fluid injection, static sparking, and splash-
ing in the eyes or on the skin
Starting and Adjusting the Pump
Be sure the air regulator and bleed–type master air valve
are closed. DO NOT INST ALL THE SPRA Y TIP YET!
Place the suction tube (21) in the fluid pail. Open the
bleed-type master air valve. Hold a metal part of the
spray gun firmly to the side of a grounded metal pail and
trigger the gun. Slowly open the air regulator until the
pump starts. Allow the pump to cycle slowly until all the air
is pushed out of the fluid lines. Release the gun trigger
and engage the safety latch; the pump will stall against
the pressure.
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 triggered and released.
Operation/Maintenance
Follow the Pressure Relief Procedure W arning on
page 5, then install the spray tip in the gun.
Use the air regulator to control the pump speed and fluid
pressure. Always use the lowest pressure necessary to
achieve the desired results. Higher pressures waste fluid
and cause premature wear of the pump packings and
spray tip.
Keep the wet-cup filled with Graco Throat Seal Liquid
(TSL) to help prolong the packing life. Check the tight-
ness of the packing nut weekly. The packing nut should
be tight enough to prevent leakage – no tighter. Always
follow the Pressure Relief Procedure Warning on page
5 before adjusting the packing nut or adding TSL.
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. If your pump acceler-
ates 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 supply
container and prime the pump and lines with fluid, being
sure to eliminate all air from the fluid system, or flush the
pump as described in Shutdown and Care, following.
Heated Systems
Operating instructions for a heated circulating system
are provided in the V iscon Heater manual, 307-805.
Read and understand all warnings and instructions in the
heater manual before operating a heated system.
In circulating systems, adjust the back pressure regulator
(33) and pump air regulator (16) to obtain proper spray
pressure at the gun and maintain suf ficient circulation
flow to prevent fluid settling.
The three-way ball valve (30) selects either fluid circula-
tion or draining. To circulate fluid back to the pump, turn
the handle toward the CIRC end of the valve. T o drain
fluid, turn the handle toward the DRAIN end.
Shutdown and Care
Always follow the Pressure Relief Procedure Warning
on page 5 whenever you shut of f the pump. Stop the
pump at the bottom of its stroke to keep fluid from drying
on the exposed displacement rod and damaging throat
packings.
Always flush the pump with a compatible solvent before
the fluid can dry on the displacement rod, and at the end
of each day. If you are pumping water-based fluid, flush
first with water and then with mineral spirits. If you are
pumping oil-based fluids, flush with mineral spirits only .
Relieve pressure and leave the mineral spirits in the
pump to prevent corrosion.
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