Graco Ratio Monark Hydra-Spray Series, Instructions-Parts List Manual

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Operation
Use the pump 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.
The fluid regulator (66f) used on model 231162 is a
fluid pressure type. It allows you to run the pump at an
“efficient” air pressure (above 30 psi [2.1 bar]) while
adjusting fluid pressure with the regulator. The back
pressure regulator (83) used on models 224629 and
231161 does the same by requiring a minimum flow
rate and also setting the minimum circulating rate
needed to prevent fluid from settling.
Keep the wet-cup filled with Graco Throat Seal Liquid
(TSL) or other compatible solvent, to help prolong the
packing life.
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 sys-
tem, or flush the pump as described in
Shutdown and
Care, at right.
Heated Systems
Operating instructions for a heated circulating system
are provided in the Viscon
Heater manual, 307805.
Read and understand all warnings and instructions in
the heater manual before operating a heated system.
The three-way ball valve (78) can be set for either fluid
circulation or draining. To circulate fluid back to the
pump, turn the handle toward the CIRC end of the
valve. To drain fluid, turn the handle toward the DRAIN
end.
Shutdown and Care
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 14.
Always relieve the pressure whenever you shut off
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 to protect the pump parts. 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.