Graco EcoQuip 300 Operation, Repair, And Parts page 14

Operation
20. Open the abrasive ball valve.
NOTE: Make sure the pot pressure returns to the NOTE: NOTE:
initial setting (it will not return to the initial setting
if the metering valve is closed).
21. Engage the blast control switch and begin
blasting.
NOTE: You may have to wait 1–2 minutes for the
NOTE: NOTE:
abrasive material to reach the nozzle.
NOTE: Pot pressure and blast pressure should NOTE: NOTE:
equalize during blasting. Only set pot pressure
with the abrasive ball valve closed. Never adjust
pot pressure while blasting.
14
22. Slowly adjust the abrasive meter valve while the
abrasive is blasting from the nozzle. Typical
adjustment ranges from 1/8 to 1/4 turn open.
NOTE: The DataTrak can be used to assist in
NOTE: NOTE:
setting the pump cycle rate. Optimal abrasive
media consumption typically occurs with the
cycle rate set at 7–10 cycles per minute.
NOTE: NOTE: NOTE: Use a piece of test material similar to
what you will be blasting.
NOTE: Always start as gently as possible and
NOTE: NOTE:
then increase the blast force as necessary to
clean without doing any damage to the substrate.
When properly set, the pump should cycle 7-10
times per minute. High production rate users
may need to increase cycle rate above 10 cycles
per minute.
NOTE: Close the abrasive ball valve whenever
NOTE: NOTE:
you stop blasting for more than 2-3 minutes.
This will help to extend the service life of the
diaphragm valve.
0 0 0 0 0
0 0 0 3 8
9
334143C