28
29
Clogged spray gun
Encrusted hardened material, a stone or a spray tip with
too small a passage for the material being used could
cause a blockage in the spray gun.
Relieve the pressure in the hoses by reversing the pump
direction of rotation for a few moments.
Always relieve the pressure in the hoses by
making the pump turn in the reverse direction
for a few seconds (5 ÷ 10), before disconnecting the
spray gun. The pressure gauge indicating the mortar hose
pressure should show a pressure of 0 bar.
Stop the pump
(32)
and, for greater safety, switch off the
machine
(35)
.
The operator should have been specifically
trained to carry out this operation.
Before opening a coupling in particular, ensure that there
is no residual pressure in the hoses and that no other
persons are in the vicinity.
This potentially hazardous operation should always be
carried out by an expert person exercising the utmost
caution.
Disassemble the spray tip and if necessary the gun and
remove the cause of clogging.
Before reassembling the spray tip or the spray gun, ensure
that the nozzle is clear (if necessary clean it) and that
material flows freely from the hose.
Incorrect stator adjustment
An incorrectly adjusted stator can result in no material
flowing out of the spray gun or even plugging up at the
beginning of the hose due to overheating of the material.
In these cases the
pressure shown by the
mortar hose pressure
gauge
(33)
is at the
working value.
The stator must be
adjusted (page 17).
If material tends to drip from the spray gun during
operation, use a spray tip or nozzle with a smaller hole.
If material flows from the spray gun intermittently during
operation, first check that there is material in the hopper
and then check if the machine is starting and stopping
without reason, that is, without any external intervention.
In this latter case, check for bends or kinks in the air hose
and for clogging of the air nozzle.
33
6.2 - OTHER PROBLEMS
Summary of Contents for POLI T
Page 31: ...31 ...
