CALPEDA MXV 50-1616/C [50/80] Replacing the ball bearing
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CALPEDA MXV 50-1616/C [50/80] Replacing the ball bearing

CALPEDA MXV 50-1616/C [50/80] Replacing the ball bearing
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.
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 ball bearing
100-112 6208, 2Z, C3
132 6310, 2Z, C3
160-180 6313, 2Z, C3
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 - in the with nuts
on tie-bolts upp. cov. coupling (70.19)
35 Nm 50 Nm 60 Nm 50 Nm 40 Nm
When tightening the nuts (28.04), be careful not to scratch
the shaft with the second wrench used on the opposite side.
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.
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)
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.
64.00
36.00
Parte
14.20
14.02
36.52
34.02
L1
rotante
fissa
Parte
36.00
4.93.226/1
Fig.5 Inserting the mechanical seal
(*)
64.22
64.25
L2
64.00
4.93.226/2
Fig. 6a
Rotor rested, with shaft not
locked in the coupling.
(*) Pin for raising the shaft.
Fig. 6b
Rotor raised, position for locking
the shaft in the coupling.
Variation 1: suction on the left, Variation 2: suction on the right,
delivery on the right delivery on the left
Fig.7 Orientation of the ports in a horizontally-fitted pump
4.93.213/3 4.93.213/4
10
Rotating
part
Fixed
part

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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 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 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 Fig 6a Rotor rested with shaft not locked in the coupling Pin for raising 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 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 ball bearing 100 112 132 160 180 6208 2Z C3 6310 2Z C3 6313 2Z C3 Fig 6b Rotor raised position for locking the shaft in the coupling 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 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 28 04 nuts 61 04 on tie bolts screws 61 07 screws 64 25 screws 70 18 with nuts lantern in the upp cov coupling 70 19 35 Nm 50 Nm 60 Nm 50 Nm When tightening the nuts 28 04 be careful not the shaft with the second wrench used on the opposite side 40 Nm to Variation 1 suction on the left delivery on the right Variation 2 suction on the right delivery on the left 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 t before dispatch submission scratch Changes reserved

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