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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.
Use every precaution so as not to damage the seal
surfaces with blows or angular impact.
Only for MXV(L)(4) 65,80
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).
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).
64.00
36.00
Parte
Rotating
rotante
part
Fig.5 Montaggio tenuta meccanica
Fig.5 Inserting the mechanical seal
8.4.1. Replacing the cartridge mechanical seal
(MXV
25,32,40,50)
(*) Unscrew the screws (32.04) and screwed up the
screws to the cover plate for seal (42.00) for remove
it. After remove the cover plate for seal (42.00) from
the shaft (64.00), unscrew the screws (42.12) remove
the sleeve (seal jacket) (42.10), the washer (42.14) so
remove the stationary face of mechanical seal from the
the cover plate for seal (42.00). Insert the stationary face
of mechanical seal into the cover plate for seal (42.00),
(*)
position the rotary face of mechanical seal, the washer
(42.14) and re-assembly the sleeve (seal jacket) (42.10)
with the screws (42.12).
Replace the o-ring (42.04) of the cover plate for
seal (42.00) and re-assembly the cartridge seal in
the shaft (64.00), so screwed up the screws (32.04)
with alternated crossover tightening procedure in
diametrically opposite positions.
Fig. 6a
With motor higher than 4 kW, with the pump assembled,
Rotore appoggiato
unscrew the screws (32.32) and the guard (32.30),
albero non bloccato
nel giunto. (*) Spina per
so unscrew the screws (32.25 e 64.34). Remove
sollevamento albero
the screws (64.32) and continue with the procedure
described in the point (*)
Only for MXV(L) 100, MXV(L)4 100 (see section 16.
page. 132).
8.5. Replacing the ball bearing MXV(L), MXV(L)4
If the ball bearing (66.00) has to be replaced, use a
2RS1 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
80-90
100-112
132
132 (MXV 100)
160-180
160-180 (MXV 100)
200-225(MXV 100)
MXV, MXV-B Rev100000244_01 - Operating Instructions
Parte
Fixed
fissa
part
34.02
14.20
36.52
14.02
4.93.226/1
4.93.226/2
64.22
64.25
64.00
Fig. 6b
Rotore sollevato,
posizione di
bloccaggio
albero nel giunto
ball bearing
6207, 2RS1, C3
6208, 2RS1, C3
6310, 2RS1, C3
6212 2Z
6313, 2RS1, C3
7212 BEP / 6212 2Z
7214 BEP / 6214 2Z
8.6. First-stage bearing and intermediate bearing
The 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.. 25-312, MXV.. 32-512 e MXV..
40-911, MXV.. 50-1509, MXV 50-2009, MXV 65-3208
and MXV 80-4806 units, there is also an intermediate
bearing (see section 15.).
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 15.) so as
to be able to remount the components correctly.
8.7. Pumps with IP 55 protection (Special con-
struction)
OFF
To always assure IP 55 degree of protection, it is
36.00
necessary to check the following points:
- Before starting the motors, carefully control the
position of the gasket between terminal box and
its cover. For cable of small size, use a protective
covering between cable and cable gland.
- When disassembling the end shields of the motors,
restore the existing joint using the sealing glue
LOCTITE type 510 or other equivalent sealing
system, if any, and check the perfect assembly of the
sealing ring on the shaft.
9. REMOUNTING
To remount the components follow the dismantling
procedure in inverse order (see section 8.3.).
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). Lubricate the seal rings with clean
water or any other compatible lubricant
.
9.1. Tightening torque
Type
impeller nuts (28.04)
nuts (61.04) on tie-bolts
screws (32.74) lantern upp. cov
screws (32.04) flange for seal
screws (64.25) in the coupling
screws (70.18) with nuts (70.19)
Type
impeller nuts (28.04)
nuts (61.04) on tie-bolts
screws (61.07) lantern upp. cov
screws (32.74) lantern upp. cov
screws (32.04) flange for seal
screws (64.25) in the coupling
screws (64.32) in the coupling flange 40 Nm
screws (70.18) with nuts (70.19)
When tightening the nuts (28.04), be careful not to
scratch the shaft with the second wrench used on the
opposite side.
MXV-B
MXV...
25-32-40-50
25-32-40
8 Nm
8 Nm
50 Nm
50 Nm
-
30 Nm
-
3 Nm
-
40 Nm
-
40 Nm
MXV... MXV...
MXV...
50
65-80
100
30 Nm 35 Nm
-
50 Nm 50 Nm
-
-
60 Nm
-
30 Nm
-
-
4 Nm
-
-
40 Nm 50 Nm M6 10,5 Nm
M8 24 Nm
-
-
40 Nm 40 Nm M12 40 Nm
M16 75 Nm
Page 21 / 136
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