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Troubleshooting
Symptom
No clay is extruded.
Rough-surfaced clay keeps
coming out of the extruding slot..
Clay is extruded as it rotates.
The extruded clay has holes.
The screw stops.The circuit
breaker trips.
The clay in the nozzle
becomes hard.
The vacuum pressure is low.
The vacuum gauge reading
does not increase.
Clay is not de-aired.
Clay comes up to the vacuum
chamber.
The vacuum pump is not
operating properly.
The hopper cover will not
open even if the pressure
relief valve is opened.
13
Cause
There is not enough clay.
The clay in the case is too soft.
The clay in the nozzle is hard.
Dry clay is stuck in the end of the nozzle
(cylindrical part).
Clay is too soft.
Clay is not properly de-aired.
There is too much clay or the air remains in the
end of the nozzle (cylindrical part) because the
nozzle is clogged with clay.
×
Clay is hard during mixing.
A large clay lump is caught between the screw
and the case.
There is too much clay.
The clay in the nozzle is dried.
The vacuum gauge reading does not increase
even if the air inlet is covered with fingers.
→The tube comes off or the tube is torn.
The vacuum gauge reading increases if the
air inlet is covered with fingers.
→A)The gap between the hopper cover and the
barrel becomes larger.
→B)The filter is clogged.
The air inlet is clogged with clay.
De-airing time was too short.
There is too much clay.
The hopper case is already vacuumed, preventing
the pump valve from being actuated.
The air inlet is clogged with clay, keeping the
hopper case vacuumed.
Remedial action
Add clay until the case is filled with that clay.
Since the clay is soft, add slightly hard clay.
Remove the clay in the nozzle.
Clean the inside of the nozzle.
Add some leather hard clay or open the
hopper cover for a while to help dry the clay.
De-air the clay.
Remove some clay.
Remove some clay from the nozzle.
〇
Add water to make the clay softer.
Remove the clay lump.
Remove some clay
Clean the nozzle by removing it.
Connect the tube or replace the tube.
A)Use wet cloth, or the like, to clean the
mating surfaces of the case and the
hopper cover.
B)Clean the filter.
Before de-airing, clean the air inlet and
its peripheral area. If the air inlet is still
clogged with clay during mixing, there is
too much clay. Remove some clay.
Extend the mixing time in vacuum.
Remove the vacuum chamber cover (acrylic
plate) and remove clay.
The vacuum pump may stop working when
the hopper case is already vacuumed.
Open the pressure relief valve to pressurize
the hopper then start the operating the
vacuum.
Insert a thin rod or the like from the nozzle
end to allow air to flow into the hopper
case.
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