Graco EcoQuip 2 EQp Operation, Repair, And Parts page 25

Problem
While in BLAST mode, with
the blast control switch (B)
engaged, air is flowing from
the nozzle but little or no
abrasive is flowing from the
nozzle.
3A4802D
Cause
The abrasive ball valve is closed.
The abrasive metering valve is not
properly set.
The pot does not have a sufficient
amount of abrasive.
The pinch valve does not open.
Obstruction in blast outlet circuit
There is an obstruction inside the pot
or inside the abrasive hose between
the pot and the enclosure.
The pot pressure is too low.
Solution
See Setting Up the Equipment on page 12.
See Setting Up the Equipment on page 12.
See Refilling the Pot with Abrasive on
page 17.
Engage the blast control switch (B) and
check for actuation of the pinch valve. If
there is no actuation, disconnect the orange
tubing at the pinch valve. If the pinch valve
opens and source air is coming from the
orange tubing, confirm that the tubing is cor-
rectly routed. If the pinch valve does not
open, replace it. If the pinch valve opens and
there is no source air coming from the tub-
ing, inspect the mufflers on the 4-way valve
for debris. If debris is not present, clean or
replace the 4-way valve.
Follow Debris in Media Path on page 29 to
check for obstruction.
Follow Debris in Media Path on page 29 to
check for obstruction.
With the blast control disengaged, allow the
pot to pressurize and wait for the pump to
stall. If the pot pressure gauge does not
reach 185 psi (12.75 bar, 1.275 MPa), see
the "Unable to fill or pressurize the pot with
water" problem listed in this table.
Operation
25