24
25
To replace the pumping unit proceed as follows:
First of all stop the pump and then cut off the
power supply to the control panel.
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.
•Raise the hopper protective grid.
• Remove the bolt fixing the screw to the agitator impeller.
• Fully loosen the adjusting screws
(34)
of the clamp and
then widen it using the relative screws
(54)
.
Remove the material delivery header, loosening the
retaining nuts of the stay rods
(55)
.
Take the stator-screw
unit, clamp it, lock the
stator and using a suitable ø
12 mm rod of suitable length
(80 cm) inserted into the hole
made for the bolt to fix the
screw to the universal joint of
the impeller (or to the impeller),
loosen the screw until it can be
removed.
Check if the screw is still
useable (the diameter should
be no more than 3 mm less
than the original value) and if it
is not use a new screw as well
as a new stator.
This check is carried out by resting the screw on a
horizontal surface and checking that the distance of the
impeller tips from the surface is not less than
(56)
:
- 59 mm for screw 2L6
- 71 mm for screw T25
- 78 mm for screw 60.12.
To mount the unit, grease both the screw and the stator well
with Vaseline or grease for tyres (under no circumstances
use mineral oils or greases, otherwise the chamber would
be irreparably damaged!). Following the procedure used
for dismantling but in the reverse order, mount the screw
onto the stator and fully tighten.
The stator should be mounted with the more flared side
facing the hopper.
4.6 - REPLACING THE PUMPING UNIT
54
54
34
56
55
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