Maintenance; Weekly Flushing; Flushing Before Storing - Graco A Series Instructions-Parts List Manual

Maintenance

Maintenance
1. Keep the pump and hose fully primed with the
masking liquid when it is not in use. This is done by
relieving the pressure.
NOTICE
Do not allow the supply container to be completely
emptied. If that happens, the pump will start to run
too fast and it could be damaged. If the pump starts
to run too fast, disconnect the air line immediately.
Prime the system with masking liquid (see page 8) or
flush it as instructed in Weekly Flushing.
2. Lubricate the air motor daily. Disconnect the regula-
tor, place about 15 drops of light machine oil in the
pump air inlet, reconnect the regulator and turn on
the air supply to blow oil into the motor.
3. If fluid drips steadily from the motor weep port, or
the pump requires more than 35 psi (0.24 MPa, 2.4
bar) air pressure to cycle when the gun is triggered,
adjust the packing nut. See Pump Packing Nut
Adjustment, page 13.

Weekly Flushing

NOTICE
Thorough flushing is required at the end of each
work week and before using a system that has been
stored. Flushing keeps a system free of dried or
aging material, such as discolored or jellied
material.
Equipment Needed:
4 gallons warm water: use empty 3M container
5 gallon bucket for water
Cloth rags
1. Turn the air regulator handle to zero (fully left). Dis-
connect the air hose.
2. Remove the spray tip from the gun. (F
12
3. Pour 4 gallons of warm water into the empty 3M
container.
4. Move the pump to the flushing container.
5. Connect the airline to the pump.
6. Release the trigger safety latch.
7. Aim the fun into the flushing pail and squeeze the
gun trigger and hold it open.
8. Slowly open the air regulator until the pump is run-
ning slowly and smoothly.
9. Using very low pressure, direct the spray from the
gun back into the flushing container. Circulate the
water in this way for serval minutes. Then release
the trigger, set the trigger safety latch, and discon-
nect the air line to the pump.
10. Raise the pump out of the pail. trigger the gun to
force the water from the system. DO NOT run the
pump dry for more than 10 seconds to avoid damag-
ing the pump packings.
11. Wash the exterior of the pump and all components
with a cloth and water. Scrub any dirty areas and
threads to remove residue.
12. Dry the pump and all components with a clean, dry
cloth.
NOTE: If you plan to use the pump again soon, prime it
with masking material.
If you plan to store the pump, continue as follows:

Flushing Before Storing

1. Flush as in Steps 1 through 11, above, but use
warm, soapy water.
2. Move the pump to a container of mineral spirits.
Do not use paint solvents to flush, which will damage
pump seals.
. 7)
IG
NOTICE
308069P