Graco Dura-Flo 7847, Instructions Manual

Page: 14 / 34

Operation
14 311828F
Startup
1. Connect the suction kit (T) to the pump's fluid inlet,
and place the tube into the fluid supply.
2. Prepare the pump’s power source:
a. For air-powered pumps, close the air regulator
(F). Open the pump's bleed-type master air
valve (E).
b. For hydraulic-powered pumps, check the
hydraulic fluid level before each use, and add
fluid as necessary. Close the supply line shutoff
valve (U) and the return line shutoff valve (V).
Start the hydraulic power supply.
3. Hold a metal part of the gun (S) firmly to the side of
a grounded metal pail and hold the trigger open.
4. Start the pump:
a. For air-powered pumps, slowly open the air reg-
ulator until the pump starts.
b. For hydraulic-powered pumps, open the return
line shutoff valve (V) first, then slowly open the
supply line shutoff valve (U).
5. Cycle the pump slowly until all air is pushed out and
the pump and hoses are fully primed. Release the
gun trigger and lock the trigger safety latch. The
pump should stall against pressure when the trigger
is released.
6. With the pump and lines primed, and with adequate
air or hydraulic pressure and volume supplied, the
pump will start and stop as the gun is opened and
closed. In a circulating system, the pump will speed
up or slow down on demand, until the air or hydrau-
lic supply is shut off.
7. Always use the lowest air or hydraulic pressure nec-
essary to get the desired results. Higher pressures
cause premature tip/nozzle and pump wear.
a. For air-powered pumps, use the air regulator (F)
to control the pump speed and fluid pressure.
b. For hydraulic-powered pumps, use the fluid
pressure gauge (F) and flow control valve (G) to
control the pump speed and the fluid pressure.
8. 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.
Shutdown
Relieve the pressure, page 13. Stop the pump at the
bottom of its stroke to prevent fluid from drying on the
exposed displacement rod and damaging the throat
packings.
If your pump accelerates 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 container and prime
the pump and the lines with fluid, or flush and leave
it filled with a compatible solvent. Be sure to elimi-
nate all air from the fluid system.