28
29
8.1 - THE MORTAR DOES NOT COME OUT OF THE GUN
8 - TROUBLE SHOOTING
Blockage of the spraygun.
A mix that is too poor, a hardened crust of material or a
pebble or a deflector of small size for the material being
used may cause a blockage of the spraygun.
•
N
O
MATERIAL
COMES
OUT
OF
THE
SPRAYGUN
AND
THE
MORTAR
PRESSURE
GAUGE
INDICATES
A
PRESSURE
ABOVE
THE
NORMAL
20÷25
BAR
.
In this case:
• stop the machine pulling the en-
gine stop rod (40), discharge the
pressure in the mortar delivery
hoses by moving the by-pass
lever in vertical position (20); wait
that the pressure shown in the
pressure gauge (45) goes down to
zero.
Make sure that gauge
which indicates the mortar
hose pressure shows
a pressure of 0 (zero)
bar and that there is no
pressure left into the hoses
before opening a coupling
on the mortar delivery
hoses or disconnecting
the spraygun.
The operator needs to be specially trained on
the operation on this procedure.
Make sure that people are not standing close to the
machine and before opening a coupling check that there
is no pressure left into the mortar hoses.
This operation, which is potentially dangerous, has to
be always performed by qualified personnel with the
maximum caution.
• Disassemble the deflector and if necessary, the
spraygun and remove the cause of the blockage.
• Before re-mounting the deflector and spraygun make
sure that the nozzle is free (and, if necessary, clean it
with a piece of wire).
• Turn the machine on in order to make sure that the
material is flowing freely from the hoses.
Blockage of the mortar hose.
An improper mix design (see 6.2.) or a long break could
determine the blockage of the mortar delivery hose.
•
M
ATERIAL
IS
NOT
FLOWING
OUT
OF
THE
SPRAYGUN
AND
THE
MORTAR
HOSE
PRESSURE
GAUGE
SHOWS
A
HIGHER
PRESSURE
THAN
THE
NORMAL
MAXIMUM
WORKING
PRESSURE
OF
12
BAR
.
In this case:
• Close the air cock on the spraygun, the machine
stops.
• Release the pressure on the mortar delivery hoses
turning the by-pass lever in vertical position (20); wait
until the pressure shown on mortar pressure gauge falls
to zero.
Before opening a coupling of the mortar delivery hoses or
disconnecting the spraygun, make sure that the pressure
gauge shows a pressure of 0 (zero) and that
there is no remaining pressure in the hoses.
The operator needs to be specially trained in order to
perform this operation.
Make sure that people are not standing close to the
machine and before opening a coupling check
that there is no pressure left into the mortar
hoses.
This operation, which is potentially dangerous, has to
be always performed by qualified personnel with the
maximum caution.
Determine just where the mortar delivery hose is blocked:
the hose will be hard and stiff at this point;
Disconnect the blocked hose,
hit it with a hammer at
the clogged point so as
to break up the “plug” formed,
and let the hardened mix flow
out.
• Turn the machine on for
several seconds and make sure that the hose has
been freed of the “plug”: the material will flow normally
from the hose.
Pour some slurry into the hose before the point where
the blocking occourred (gun direction), connect the
hose line once again, and start over again.
20
45
40
Summary of Contents for UNI 30 D
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