Replacing The Mechanical Seal; Replacing The Ball Bearing; First-Stage Bearing And Intermediate Bearing; Remounting - Calpeda MXV Instrucciones Originales De Uso

9.1. Replacing the mechanical seal

Remove the mechanical seal (36.00), the rotating part from the
shaft (64.00), making sure the shaft is not scratched, and then
the fixed part from the upper cover (34.02).
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: i.e. counter-clockwise when seen from the stationary ring.
64.00
36.00
Rotating
Parte
part
rotante
Fig.5 Inserting the mechanical seal
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 the shaft, the seating of the
stationary part and the seal rings with clean water or any other
lubricant compatible with the material in which the seal rings are
made. Push the rotating part as far as the shoulder ring (36.52)
on the shaft (64.00), without compressing the spring. Check the
length before and after insertion and raise the rotating ring as
far as the initial length (L1 in fig.5).
In this way, correct compression of the spring will be ensured
when the fixed part is mounted and after the shaft is locked in
the coupling (L2 in fig.6b).
Use every precaution so as not to damage the seal surfaces
with blows or angular impact.

9.2. Replacing the ball bearing

If the ball bearing (66.00) has to be replaced, use a 2Z C3-type,
of the size marked on the ball bearing to be replaced and
containing grease lubricant suitable for the operating temperature.
The size of the bearing depends on the size of the motor:
motor size
100-112
132
160-180

9.3. First-stage bearing and intermediate bearing

The MXV 50-16, 65-32 and 80-48 pumps have a bearing sleeve
(64.10) on the shaft (64.00) and a bearing in the stage casing
(25.03) behind the first impeller (according to the order of suction).
Starting with the MXV 50-1611, MXV 65-3208 and MXV 80-4806
units, there is also an intermediate bearing (see section 13.1.).
If they are to be dismantled, first number the position of each
stage casing and the single spacer sleeves (see lengths and
positions of sleeves in section 13.2.) so as to be able to re-
mount the components correctly.

10. Remounting

To remount the components follow the dismantling procedure in
inverse order (see section 9.).
Check the state of the o-rings (14.20) and replace them of they
are damaged.
Make sure that the o-rings (14.20) are correctly inserted on their
seats on the pump casing (14.00) and upper cover (34.02). Lu-
bricate the seal rings with clean water or any other compatible
lubricant.

10.1. Tightening torque

impeller nuts screws (61.07) screws (64.25) screws (70.18)
nuts (28.04) (61.04) lantern -
on tie-bolts upp. cov.
35 Nm 50 Nm 60 Nm
When tightening the nuts (28.04), be careful not to scratch
the shaft with the second wrench used on the opposite side.
10
36.00
Parte
Fixed
fissa
part
34.02
14.20
36.52
14.02
4.93.226/1
ball bearing
6208, 2Z, C3
6310, 2Z, C3
6313, 2Z, C3
in the with nuts
coupling (70.19)
50 Nm 40 Nm
ATTENTION: the nuts (61.04) on the tie-bolts (61.02), the screws
(61.07) on the upper cover and the screws (70.18) with the nuts (70.19)
on the lantern bracket must be uniformly tightened with alternated
crossover tightening procedure in diametrically opposite positions.
(*)
Fig. 6a
Rotor rested, with shaft not
locked in the coupling.
(*) Pin for raising the shaft.

10.2. Axial position of the pump rotor

In the vertical position and from the resting position (fig.6a),
raise the rotor, levering on a pin inserted in the hole in the shaft,
until the pin can be rested under the coupling (64.22).
In this position (fig. 6b), by tightening the screws (64.25) uni-
formly, the shaft (64.00) is locked tight in the coupling.
Remove the pin.
Mount the motor as indicated in section 4.

11. Horizontal installation

11.1 Connection of support feet

For the mounting of the support feet all tour nuts (61.04) on the
tie-bolts (61.02) must be removed (see cross-section drawing in
section 13.).
ATTENTiON: do not loosen only the two nuts on the side of
the upper cover to which the support foot is to be attached.
To remove the 4 nuts (61.04) the lantern bracket (32.00)
must be removed. With the pump in the vertical position, carry
out dismantling sequences 1 - 6 in section 9.
Remove the washers (61.03) and attach the support foot
(61.30) on the side of the upper cover (34.02) in the appropriate
position depending on the directional arrangement of the pump
casing (14.00) suitable for the system: suction on the left and
delivery on the right, or vice-versa (fig.7)
4.93.213/3
Variation 1: suction on the left,
delivery on the right
Fig.7 Orientation of the ports in a horizontally-fitted pump
Do not insert the two washers (61.03) on the support foot when
the tie-bolts (61.02) do not protrude from the nuts (61.04).
The 4 nuts must be uniformly tightened with alternated
crossover tightening procedure in diametrically opposite
positions. Tightening torque as per section 10.1.
Mount the lantern bracket (32.00) with the coupling (64.22) and
position the pump shaft as indicated in section 10.2.
Mount the motor as indicated in section 4, and orientate the
terminal board with respect to the support foot (61.30) in the
position most suitable for the system.
After setting the pump in the horizontal position, fix the second
support (61.30) to the base (61.00), with the screws (61.30),
washers (61.34) and nuts (61.36), and check for accurate
levelling of the installation with respect to the first foot.

12. Spare parts

When ordering spare parts please quote their designation, position
number in the cross section drawing (section 13.) and rated
data from the pump name plate (type, date and serial number).
Any pumps that require inspection/repair must be
drained and carefully cleaned inside and outside
before dispatch/submission.
Changes reserved.
4.93.226/2
64.22
64.25
64.00
Fig. 6b
Rotor raised, position for locking
the shaft in the coupling.
Variation 2: suction on the right,
delivery on the left
4.93.213/4