Graco 3A0096B Manuale Utente

If the pump fails to prime properly, open the pump bleed 
valve (N) slightly. See F

. 6. Use the bleed hole, on the 

underside of the valve, as a priming valve until the fluid 
appears at the hole. Close the plug.

NOTE: Always use lowest possible fluid pressure to 
bleed air out of pump.

NOTE: When changing fluid containers with the hose 
and valve already primed, open the pump bleed valve 
(N), to help prime the pump and vent air before it enters 
the hose. Close the valve when all air is eliminated.

With the pump and lines primed, and with adequate 
input pressure and volume supplied, the pump will start 
and stop as you open and close the valve. In a circulat-
ing system, the pump will speed up or slow down on 
demand until it is shut off.

1.

Stop the pump at the bottom of the stroke to prevent 
fluid from drying on the exposed displacement rod 
and damaging the throat packings.

2.

Follow Pressure Relief Procedure, page 13.

3.

Always flush the pump before the fluid dries on the 
displacement rod. See Prime/Flush on page 13.

To reduce the risk of fluid injection, do not use your 
hand or fingers to cover the bleed hole on the under-
side of the bleed valve body (N) when priming the 
pump. Use the handle or a crescent wrench to open 
and close the bleed plug. Keep your hands away from 
the bleed hole.

Do not allow the pump to run dry. It will quickly accel-
erate to a high speed, causing damage. If your pump 
is running too fast, stop it immediately and check the 
fluid supply. If the container is empty and air has been 
pumped into the lines, refill the container and prime 
the pump and the lines, or flush and leave it filled with 
a compatible solvent. Eliminate all air from the fluid 
system.

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N

Never leave water or water-based fluid in a carbon 
steel pump overnight. If you are pumping water-based 
fluid, flush with water first, then with a rust inhibitor, 
such as mineral spirits. Relieve pressure, but leave 
rust inhibitor in pump to protect parts from corrosion.