Prime The Pump And Pump Fluid; Change The Fluid Can - Graco A Series Instructions - Parts Manual

Operation
NOTE: Always use the lowest possible fluid pressure to
bleed air out of the pump.
F . 6: Pump Bleeder Valve
IG
NOTE: When changing fluid containers with the hose
and dispensing device already primed, open the pump
bleeder valve to help prime the pump and vent air
before it enters the hose. Close the valve when all air is
eliminated.
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.
10. With the pump and lines primed, and with adequate
air pressure and volume supplied, the pump starts
and stops as you open and close the dispensing
device. In a circulating system, the pump speeds up
or slows down on demand until the air supply is shut
off.
11. Use the air motor regulator to control the pump
speed and the fluid pressure.
Always use the lowest air pressure necessary to get
the desired results. Higher pressures cause prema-
ture tip/nozzle and pump wear.
12
Pump Bleeder Valve
Bleed Hole
NOTICE
NOTICE

Prime the Pump and Pump Fluid

1. Be sure the pump air regulator (27A) is closed.
Then set the ram air regulator (27B) to be about 22
psi (150 kPa, 1.5 bar). Set the ram director valve
switch (36) to the down pump.
2. Open the bleed-type master air valve (8). Set the
pump air regulator (27A) to 28 psi (200 kPa, 2 bar).
3. Open the pump bleeder valve (25) to allow air to
bleed from the pump. When the pump is fully
primed, close the valve.
4. Keep the director valve switch (36) in the down posi-
tion while the pump is operating.
NOTE: Adjust the air pressure to the ram as needed,
but do not increase it to a level where fluid is forced past
the wiper plate.

Change the Fluid Can

1. Stop the pump.
2. Close the bleed-type master air valve (8), but leave
air pressure on to the ram.
3. Set the ram air regulator (27B) to below 30 psi (210
kPa, 2.1 bar).
4. Open the dispensing valve and relieve all fluid pres-
sure in the system. See the Pressure Relief Proce-
dure on page 10.
5. Set the ram director valve switch (36) to up.
6. Push in the air assist valve (18) and hold it in until
the wiper plate clears the top of the can.
If the fluid has set up and the wiper plate (P) is stuck
in the can, do not increase the setting of the ram air
regulator (27B) to remove the plate. Excessive pres-
sure in the can may cause the can to rupture. If you
cannot pull the can off the plate by hand, loosen the
two screws (302) holding the plate to the pump (1),
disconnect the air tube (76) from the plate, and
remove the can and plate. It may be necessary to cut
the can to remove the plate.
NOTICE
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