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Maintenance
General care
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 8.
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.
2.
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 imme-
diately. Prime the system with the masking liquid
(see page 9) or flush it as instructed in Weekly
flushing.
3.
Lubricate the air motor daily. Disconnect the
regulator, 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.
4.
If fluid drips steadily from the air motor weep port,
or the pump requires more than 35 psi (240 MPa
2.4 bar) air pressure to cycle when the gun is
triggered, adjust the packing nut. See Packing nut
adjustment on page 14.
Weekly flushing
WARNING
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 as
you look at it). Disconnect the air hose.
2.
Remove the spray tip from the gun. See Fig. 7.
3.
Pour 4 gallons of warm water into the empty 3M
container.
4.
Move the pump to the flushing container.
5.
Connect the air line to the pump.
6.
Release the trigger safety latch.
7.
Aim the gun into the flushing pail and squeeze the
gun trigger and hold it open.
8.
Slowly open the air regulator until the pump is
running 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 several 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
damaging the pump packings.
11. Wash the exterior of the pump and all components
with a water and cloth. 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.
3.
Flushing before storage
1.
Flush as in Steps 1 to 11, above, but use warm,
soapy water.
2.
Move the pump to a container of mineral
spirits.
CAUTION
Do not use paint solvents to flush, which will damage
the pump seals.
3.
Trigger the gun into the flushing container. When
mineral spirits appear at the gun, release the
trigger and set the trigger safety latch. Remove the
pump.
4.
Release the trigger safety latch. Trigger the gun to
force the mineral spirits from the system. DO NOT
run the pump dry for more than 10 seconds to
avoid pump packing damage.
5.
Disconnect the hose and gun and store the pump.
