8 306769
Operation
WARNING
Never operate the pump with the air motor plates
removed. Moving parts in the air motor can pinch
or amputate fingers.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 7.
The pump was tested in oil, and some oil was left in
the pump. If the oil will contaminate the fluid you are
pumping, flush it out.
Fill the packing nut/wet-cup 1/2 full with Graco Throat
Seal Liquid or a compatible solvent. Keep the cup filled
at all times to help prevent the fluid you are pumping
from drying on the displacement rod and damaging the
throat packings.
To start the pump, turn on the main air supply. Open
the bleed-type master air valve (A). Open the (last)
spray gun. Slowly open the air regulator until the pump
is running smoothly (about 40 psi (280 kPa, 2.8 bar)].
Operate the pump until all air is purged from the
system. Release the gun trigger and engage the gun
safety latch.
Use the air regulator (F) to control fluid pressure and
pump speed. Always use the lowest pressure
necessary to get the desired results. Higher pressures
cause premature pump wear and spray tip wear, and
usually do not improve the spray pattern.
WARNING
To reduce the risk of overpressurizing your system,
which could result in component rupture and cause
serious injury, never exceed 120 psi (840 kPa, 8.4
bar) Maximum Incoming Air Pressure to the pump.
In a direct supply system, with adequate air pressure
supplied to the motor, the pump starts when the gun or
dispensing valve is opened, and stalls against
pressure when it is closed.
If the pump accelerates quickly or is running too fast,
stop it immediately. Check the fluid supply and refill it if
necessary. Prime the pump to remove all air from the
system, or flush the pump and relieve the pressure.
NOTE: A pump runaway valve (B) can be installed on
the air line to automatically shut off the pump if it starts
to run too fast.
Shutdown and Care of the Pump
Always stop the pump at the bottom of its stroke to
prevent fluid from drying on the rod and damaging the
throat packings.
If you are pumping fluid which dries, hardens, or sets
up, flush the system with a compatible solvent as often
as necessary to prevent a buildup of dried fluid in the
pump or hoses.
Check the tightness of the packing nut weekly. It
should be tight enough to stop leakage, but no tighter.
Always relieve the pressure before adjusting the
packing nut.
Flushing
To reduce the risk of injection injury, static sparking, or
splashing, relieve the pressure and remove the spray
tip before flushing. Hold a metal part of the gun/valve
firmly to the side of a grounded metal pail and use the
lowest possible fluid pressure during flushing.
