RWCP, RWCN
13
-
Extract the seal. If the lantern ring is also extracted, note
down the order.
7.4.5 Pump
For the extraction of ball bearings, shaft, bearings, etc., it is
necessary l to dismount the entire pump.
To do this, see the sectional plan and diagram with a
breakdown of the attached pieces.
Before dismantling the pump, remove it from its location:
-
Release the pins which fix the attachment plate to the
support plate of the well.
First check that the lifting clamp bolts are securely in
place, as they will be used to lift the equipment. In
this position, leave to drain for a few moments to
discharge the fluid contained in the pump.
-
Lay down or support the equipment on the edge of the
attachment plate, supporting the motor to ensure it does
not rest on it as a cantilever.
DISMANTLING:
As a general guide to dismantle the equipment, follow these
steps:
-
Loosen the screws which join the pump to the support
supplement, therefore releasing it. (1)
-
Release the auxiliary connections. (2)
-
It is not necessary to release the suction hood, although
we can clean it if the orifices are blocked. (3)
-
Release the Allen screw which secures the impeller and
extract it. At this moment the wear rings are accessible
(where appropriate). (4)
-
Release the nuts which secure the support supplement
to the intermediate pipe (5).
- Remove the impeller cotter and remove the re-
changeable bushing. Check the state of the friction
bearing located in the bearing carrier cover. (6)
-
If an intermediate bearing is fitted (7):
o
Release the nuts which join the intermediate bearing
support to the lower intermediate pipe and extract it.
o
Release the nuts which join the intermediate bearing
support to the upper intermediate pipe.
o
Remove the whole intermediate bearing support by
taking it to the side of the impeller, sliding it along
the shaft without coming into contact with the edges.
o
Observe the state of the friction bearing.
-
Release the nuts which join the distancer pipe to the
support, and remove the distancer pipe. (8)
- When an intermediate coupling is fitted, follow that
indicated in point
-
Release the bolts which join the motor to the support,
and dismount the motor and the coupling as shown in
point
-
If fitted, release the seal or the packing as described in
point
, if not, release the retainer.
-
The support cover is released.
-
Using a plastic hammer, gently bang the shaft on the
side opposite the motor, causing the shaft and the
bearings to come up where the motor was.
-
Loosening the nut(s) of the bearings will release them
and the pump as a whole.
Failure of the bearings may cause ignition through
increased heat on the surface of the bearings. This
can be avoided by using officially approved quality bearings,
which are supplied as original spare parts.
7.5 Assembly
7.5.1 Coupling
Motor pump coupling
- Proceed in inverse order to assembly. It
is not necessary to check the alignment,
due to the design of the pump in which the concentricity
of the shafts is guaranteed by way of guides between the
motor and the pump support.
Note
Intermediate coupling
-
The two shafts are positioned: motor side and pump side
in line, then position the cotter.
- Introduce the coupling in both ends of the shaft and
attach axially with two screwed cover halves on each
side.
