Graco EcoQuip 300, Operation, Repair, And Parts

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Operation
13. When the water level reaches the bung seal,
rotate the handle to release the bung pin (this
will cause the bung to pop up against the seal
and close the bung).
14. Turn the selector valve to FILL.
NOTE: NOTE:
NOTE: The water pump should begin cycling. If
not, open the pot pressure regulator enough to
cause the pump to run at 60 cpm.
NOTE: NOTE: NOTE: The auto vent/purge valve will allow all
of the air trapped in the top of the pot to vent.
When air stops venting, the pot pressure gauge
will start to register pressure.
15. Wait for pot pressure to increase. NOTE: NOTE: NOTE: It
can take up to several minutes for the pot to
pressurize.
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NOTE: NOTE: NOTE: The bung cannot be pushed down unless
all of the pressure in the pot is released by
opening the dump valve.
16. Set the pot pressure 30 psi (2.0 Bar, 0.2 MPa)
higher than the intended blast pressure. Quickly
open and close the dump valve after the pump
stalls. Relieve pot pressure to 40 psi (2.7 Bar,
0.27 MPa) before closing the dump valve.
Repeat until pot pressure is consistent.
17. Turn the selector valve to WASH.
18. Set the blast air pressure 30 psi (2.0 Bar, 0.2
MPa) lower than the pot pressure while blasting.
NOTE: NOTE: NOTE: In order to adjust the blast pressure, the
blast control must be engaged. For the initial
setting, leave the abrasive ball valve closed.
NOTE: NOTE:
NOTE: Engage and release the blast control
handle each time the blast regulator is adjusted.
19. Turn the selector valve to BLAST.
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