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It is forbidden to execute any operations with
the direct use of hands. Use water-resistant,
anti-cut gloves to disassemble and clean the
filter or in other particular cases.
During
maintenance
i
personnel is not allowed.
EN
Maintenance operations that are not described in
this manual must be made only by special personnel
authorized by Calpeda S.p.A.
For further technical information regarding the use or
the maintenance of the device, contact Calpeda S.p.A.
8.1. Routine maintenance
OFF
Before
disconnect the power supply and make sure
that the device could not accidentally operate.
Under normal operating conditions the pump-motor
unit will not require maintenance.
Conduct routine inspection on the pump and connected
parts to check for a perfect seal.
Check the seal on the shaft from the outside through
the coupling guard.
The special funnel-shaped upper cover is designed to
contain any small initial leaks.
Keep the pump and surrounding part clean so as to be
able to immediately detect any outward leakage.
Clean the filter in the suction pipe and/or foot valve
at regular intervals; check performance and absorbed
current.
The ball bearings in the motor and the ball bearing in
the pump (66.00 - see section 8.5) have permanent
lubrication.
No regreasing is necessary.
See the operating instructions of the motor (if supplied).
Remove any excess grease expelled from the ball-
bearing (66.00) after the first period of operation.
In the case of water containing chloride (chlorine or
sea water) the risk of corrosion increases in stagnant
water conditions (also with an increase in temperature
and decrease of pH value). In these cases, if the pump
remains inactive for long periods, it must be emptied
completely.
For good measure, as for temporary operation with
dirty liquids, run the pump briefly with clean water to
remove deposits.
Or, after draining, perform the washing operation,
inserting clean water (at least 40 litres) into the filling
hole (1) on the delivery side and allowing it to come
out of the draining hole (3) on the suction side (fig.4).
When the pump remains inactive it must be
emptied completely if there is a risk of freezing.
Before starting the motor again fill the pump completely
with liquid (see section 7.2.) and make sure the shaft
is not jammed by encrustation, sticking of the faces of
the mechanical seal or other causes. In the event that
the shaft cannot be moved by hand, the pump has to
be dismantled and cleaned.
Disconnect electrical power before any
servicing operation and make sure the
pump cannot be accidentally switched on.
8.2. Dismantling the system
Close the suction and delivery gate valves and drain
the pump casing before dismantling the pump.
8.3. Dismantling the pump
OFF
Before dismantling, disconnect the power cable from
the terminal box, close the gate valves in the suction
and delivery pipes and empty the pump casing (fig. 4).
For dismantling and re-assembly refer to the section
drawing (section 14.) and figures 5, 6.
Page 20 / 136
operations
every
maintenance
Dismantling and inspection of all internal parts can be
carried out without removing the pump casing (14.00)
from the pipeline.
Sequence for dismantling MXV-B:
external
By removing the nuts (61.04) from the tiebolts (61.02)
the motor can be taken out complete (99.00), with all
internal parts of the pump without removing the pump
casing (external jacket 14.02) from the pipeline.
Sequence for dismantling MXV(L), MXV(L)4:
1. Mark the position of the motor on the flange (32.70),
and the position of the flange on the lantern bracket
(32.00), the position of the lantern bracket on the
external jacket (14.02), ... on the pump casing
(14.00).
2. Remove the screw (32.32) with the washer (32.31)
and the coupling guard (32.30).
operations
3. Remove the screws (64.25) and the screw (64.34)
from the coupling (64.22)
ATTENTION: to avoid compressing the spring of the
mechanical seal (36.00) because of axial shifting
of the shaft (64.00), we recommend to loosen the
screws (64.25) of the coupling (64.22) even only for
removing or replacing the motor.
Afterward reposition the shaft (64.00) as indicated in
section 9.2.
4. Remove the screws (70.18) with the nuts (70.19)
and remove the motor from the coupling (64.22). For
the MXV 25-32-40-50 pumps use the threaded holes
M10 of the clamp (32.78) to remove the motor
For MXV(L) 25-32-40-50:
5. Remove the screws (32.74) and remove the pump
flange (32.70) whit the bearing (66.00) and the coupling
(64.22) (for pump whit motor upper than 4 kW remove
the coupling 64.30 and 64.28) from the lantern bracket
(32.00) and from shaft (64.00) (fig.5b).
6. For removing the cartridge seal remove the screws
(32.04) and screwed up the screws to the cover plate
for seal (42.00)
7. Remove the nuts (61.04) from the tiebolts (61.02).
8. Remove the lantern bracket (32.00) from the shaft
(64.00) and from the external jacket (14.02) with the
aid of a mallet or lever, exercising pressure in alternate
operations, from diametrically opposite positions.
Once the upper cover (34.02) has been removed, all
the internal parts can be extracted from the external
jacket (14.02)
For MXV(L) 65-80, MXV(L)4 65-80:
5. Remove the screws (61.07) and remove the lantern
bracket (32.00), complete with bearing (66.00) and
coupling (64.22) from the upper cover (34.02) and
from the shaft (64.00) (fig.5a).
6. Remove the nuts (61.04) and washers (61.03) from
the tiebolts (61.02).
7. Remove the upper cover (34.02) from the shaft
(64.00) and from the external jacket (14.02) - or with
the external jacket from the pump casing (14.00) -
with the aid of a mallet or lever, exercising pressure
in alternate operations, from diametrically opposite
positions.
Once the upper cover (34.02) has been removed,
all the internal parts can be extracted from the pump
casing (14.00).
8.4. Replacing the mechanical seal
Make sure the spring of the new mechanical seal is
set with the direction of the winding suitable for the
direction of rotation of the shaft.
Make sure that all parts with which the mechanical seal
comes into contact are perfectly clean and free from
any burr or cutting edges.
The seal rings in EPDM (Ethylene-Propylene) must
never come into contact with oil or grease. To
facilitate the mounting of the mechanical seal, lubricate
MXV, MXV-B Rev100000244_01 - Operating Instructions
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