Troubleshooting
28 3A3489T
The blast hose recoils
heavily when the blast
control switch (A) is
engaged. Large slugs
of abrasive and water
are ejected from
nozzle.
The abrasive ball valve
was left open during
shut down.
See Shutdown, page 24, step 2.
The abrasive ball valve
is worn.
With the pot pressurized and the abrasive ball valve closed,
engage the blast control switch (A) and check to make sure the
pump is stalled. If the pump rod is creeping, replace abrasive ball
valve (J) or replace the abrasive ball valve seals. See Common
Spare Parts, page 48.
The pinch hose is
worn.
With the pot pressurized and the abrasive ball valve open, check to
make sure the pump is stalled. If the pump rod is creeping, replace
the pinch hose. See Replace the Pinch Hose, page 35.
The pot pressure relief
valve is discharging
water.
The water pressure
regulator is
malfunctioning.
Adjust the water pressure regulator to 185 psi (12.75 bar, 1.275
MPa). If this adjustment is not possible, service the water pressure
regulator. Refer to your regulator manual. See Related Manuals,
page 3.
The pressure relief
valve has failed.
Replace the pressure relief valve if weeping occurs at or below 185
psi (12.75 bar, 1.275 MPa).
No blast air flow when
the blast control
switch (A) is engaged.
The water pump does
cycle while the blast
control switch is
engaged.
The adjustable blast
regulator is not
adjusted to the correct
pressure.
Adjust the blast regulator to the desired pressure while the blast
control is engaged.
The tubing to the main
air regulator is not
properly connected or
there are air leaks in
the fittings or tubing.
See the Tubing Schematic, page 49. Check for leaks at
connection points.
The adjustable blast air
regulator is
malfunctioning.
Clean or replace the adjustable blast air regulator.
The main air regulator
is malfunctioning.
Disassemble the main air regulator and inspect components.
Replace or repair parts as necessary. See Enclosure Box Parts,
page 39.
Problem Cause Solution
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