Calpeda MXS-305 Betriebsanleitung Seite 8

If freezing may be expected while the pump re-
mains inactive and it is not submersed at a safe
depth, remove the pump from the water and leave
it in a dry place.
ATTENTION: if the pump is temporarily used
with dirty liquids or water containing chlori-
de, flush the pump briefly with clean water im-
mediately after use to remove any deposit.
If the pump has not been used for a long time and
does not start or gives no water (but electrical
connections are in order), the pump must be
removed from the water and checked to see if it is
choked by any foreign matter or blocked by sedi-
ment, deposits or any other cause.
Disconnect electrical power before
any servicing operation and make
sure the pump cannot be acci-
dentally switched on.
6. Dismantling
6.1. Checking rotation of the shaft
Refer to the cross-section drawing on page 39.
Remove the screws (15.70), remove the filter
15.50 with a wrench on the nut (28.04), turn the
shaft in the clockwise direction.
If the shaft is blocked and cannot be freed, disman-
tling should continue until the cause has been found
and removed.
6.2. Inspection of the hydraulic parts
Remove following this sequence: the screws
(25.28), the washers (25.26) the screws (25.32)
and the safety circlip (25.30). Extract the preload
support ring (25.24) and, if present, the spacer
(25.23). Remove the preload ring stages (25.20)
and his o-ring (25.22) using a bearings extractor
and a steel rod (fig. n°1) or, with the electropump in
vertical position, moving it up and down (fig. n°2).
It is now possible to remove all the hydraulic parts
up to the motor and it is possible to extract the
motor from the suction side. In case of pump with
float switch it is possible to pull out the motor up to
float switch arrives to the delivery casing (12.01), if
necessary to extract the motor remove, the delivery
casing (12.01) the jacket cover (76.62) and the
electrical connections as described in fig. n°7 and
then follow the sequence above.
Other parts should not be dismantled.
The motor and pump functions can be impaired
by erroneous procedure or tampering with in-
ternal parts.
6.3. Oil chamber
If the oil chamber has to be inspected, follow
these instructions:
CAUTION: there may be slight pressu-
re in the oil chamber.
Care must be taken to avoid a sudden spur-
ting of oil. Wait until the oil chamber cover
(34.03) has cooled down.
Remove the plugs (34.08) and the o-rings (34.09),
remove the oil inside the oil chamber and extract
the rotating part of mechanical seal, remove the
oil chamber cover (34.03).
When refilling the chamber use only white oil suit-
able for food machinery and pharmaceutic use
(quantity = 0,095 liters).
First, mount the fixed parts of the seal (36.00) on
the oil chamber cover (34.00) and then the oil
chamber cover (34.03) on the motor cover (70.00)
with the O-ring (70.09).
6.4. Inspection of capacitor and elec-
trical connections chamber
Remove the screws (14.20) and remove the deli-
very casing (12.01) pressing with a tool on the
provided notch (see fig. n°7), in case of pump with
float switch before remove the delivery casing
(12.01) it is necessary to remove the screw
(96.09). Remove the screws (82.11) and the o-
rings (82.12), extract the jacket cover (76.62) with
cables.
6.5. Pump re-assembly (recommen-
ded only for experts)
If the electropump is completely dismantled follow
these instructions: assembly the motor jacket with
winding (76.01) with all motor components,
mechanical seals and hydraulic parts as in fig.
n°3. Install an eyebolt M8 at the end of the shaft,
use this eyebolt to lift the motor and hydraulic part
and insert it in the external jacket (14.02). Check
the position of the reference notch and the refe-
rence height (fig. n°5), complete the re-assembly
following the sequence on fig. n°6. Rotate the
pump and make the electrical connections, close
the jacket cover with the screws (82.11) and the
o-rings (82.12) as show in fig. n°7. To check the
seal of the motor, install on the threaded hole M5
of the jacket cover (76.62) a pressurized air sup-
ply (maximum pressure 2 atm) and immerse the
pump in a water tank. If no leakage are visible,
pull out the pump from the tank, remove the pres-
surized air supply and close the hole with the pro-
per screw (82.02) and o-ring (82.03), as show in
fig.n°8.
7. Spare parts
When ordering spare parts, please quote their des-
ignation, position number in the cross section draw-
ing and rated data from the pump name plate (type,
date and serial number).
Any pumps that require inspection/repairmust be
sent back complete with cable.
Changes reserved.
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