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MXV, MXV-B Rev6 - Operating Instructions
It is suggest to register all
maintenance operation
executed.
i
During maintenance keep particular attention in
order to avoid the introduction of small external
parts, that could compromise the device safety.
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.
i
During maintenance operations external
personnel is not allowed.
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 every maintenance operations
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
.
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:
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).
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 50 pumps use the threaded holes M10 of the
clamp (32.78) to remove the motor
For MXV(L) 25-32-40, MXV(L)4 25-32-40:
5. Remove the nuts (61.04) from the tiebolts (61.02).
6. Remove the lantern bracket (32.00), complete with
bearing (66.00) and coupling (64.22) from the shaft
(64.00) and from the external jacket (14.02).
Once the lantern bracket (32.00) has been removed,
all the internal parts can be extracted with the shaft
(64.00) from the external jacket (14.02).
7. Remove the upper cover (34.02) with the o-ring
(14.20) and then the delivery casing (20.00).
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).
MXV, MXV-B Rev6.indd 20
01/10/18 17:06
