Graco 278860, Операция, ремонт и запасные части.

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Operation
3A4802D 25
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. The abrasive ball valve is closed. See Setting Up the Equipment on page 12.
The abrasive metering valve is not
properly set. See Setting Up the Equipment on page 12.
The pot does not have a sufficient
amount of abrasive. See Refilling the Pot with Abrasive on
page 17.
The pinch valve does not open. 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.
Obstruction in blast outlet circuit Follow Debris in Media Path on page 29 to
check for obstruction.
There is an obstruction inside the pot
or inside the abrasive hose between
the pot and the enclosure. Follow Debris in Media Path on page 29 to
check for obstruction.
The pot pressure is too low. 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.
Problem Cause Solution