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307160
Operation
WARNING
COMPONENT RUPTURE HAZARD
To reduce the risk of overpressurizing
your system, which could cause compo-
nent rupture and serious injury,
never
exceed the specified Maximum Hydraulic Input
Pressure to the pump
(see the
Technical Data
on
page 15).
To prevent overpressurizing the hydraulic motor or
its seals, always shut off the supply line valve (S)
first
, then shut off the return line valve (E).
Starting and Adjusting the Pump
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure
on page 8.
NOTE:
If the pump is not immersed in fluid, fill the
wet-cup (P) 1/3 full with Graco Throat Seal Liquid
(TSL) or a compatible solvent, to prevent fluid from
drying on the displacement rod and damaging the
pump packings. Refer to the Typical Installation on
page 7. Check the tightness of the packing nut/wet-
cup weekly. Before adjusting,
relieve the pressure
.
The nut should be tight enough to prevent leakage, but
no tighter.
Check the hydraulic fluid level, and add fluid as neces-
sary to the fill lines, before each use. Turn on the
hydraulic power supply. Open the return line shutoff
valve (E). Slowly open the hydraulic supply shutoff
valve (S). Run the pump slowly until all air is pushed
out of the lines and fluid is flowing smoothly. Close the
spray gun; the pump will stall. Use the lowest pressure
possible to get the desired results. Higher pressures
will cause premature tip and pump wear.
NOTE:
In a direct supply system, the pump starts and
stops automatically when the spray gun is opened and
closed. In a circulating system, the pump runs continu-
ously, speeding up or slowing down as the spray gun is
opened or closed, until the hydraulic power supply is
turned off.
CAUTION
Never allow the hydraulic oil temperature to exceed
130
_
F (54
_
C). The pump seals will wear faster and
leaking may occur at higher temperatures.
WARNING
To reduce the risk of overpressurizing the system,
always follow these precautions:
Never exceed 1500 psi (10.3 MPa, 103 bar), or
10 gpm (37.8 liter/min) hydraulic input to the motor.
Never exceed 1000 psi (7 MPa, 69 bar) maximum
pump outlet pressure.
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.
