6.
Dismantling
6.1. Checking rotation of the shaft
Refer to the cross-section drawing on page 29 - 30.
For MXS 203,204,205,206,404,405:
While the pump is positioned horizontally, remove
the screws (14.24), the square nuts (14.28) and
suction strainer (15.50). Hold the first stage casing
(25.01) tightly with one hand so that is does not
rotate and, with a wrench on the nut (28.04), turn
the shaft in the clockwise direction.
For MXS 207,8,9,10, MXS 406,7,8,9,10, MXS 805,6,7,8,9:
Remove the filter 15.50 by extracting it with a
screwdriver and hammer.
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
For MXS 203,204,205,206,404,405:
The O-ring (14.20) and then the complete motor
assembly with all internal pump parts are remo-
ved from the external jacket (14.02).
The first impeller can be inspected by removing
the first stage casing (25.01).
Once the nuts (28.04) and washer (28.08) are
removed the spacer sleeves (64.15), impellers
(28.00) and the other stage casings (25.02 and
25.05) can be dismantled one after the other.
For MXS 207,8,9,10, MXS 406,7,8,9,10, MXS 805,6,7,8,9:
Unscrew the cable gland 70.16, extract the com-
plete connector and unhook it, both for the feed
cable and the float if present. Slacken the preload
of the three bolts 12.20.
Remove the 6 bolts 14.24 and relative plugs
14.29 and remove the delivery outlet casing
12.01, extract the outer liner 14.02 keeping the
pump horizontal. The first impeller can be inspect-
ed by removing the first stage casing (25.01).
Once the nuts (28.04) and washer (28.08) are
removed the spacer sleeves (64.15), impellers
(28.00) and the other stage casings (25.02 and
25.05) can be dismantled one after the other.
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.
For MXS 203,204,205,206,404,405:
Before removing the mechanical seal (36.00), loo-
sen the screws (70.18) and raise the cover (34.03),
applying force simultaneously on two opposite
points of the cover rim, to let off pressure from the
oil chamber. Carry out this operation while holding
the motor in the upturned vertical position.
For MXS 207,8,9,10, MXS 406,7,8,9,10, MXS 805,6,7,8,9:
Remove the rotating part of the mechanical seal
36.00, extract the oil chamber cover 34.03, taking
care not to damage the O-rings 70.09 and 78.12
and the fixed part of the mechanical seal.
When refilling the chamber use only white oil suit-
able for food machinery and pharmaceutic use
(quantity = 35 g).
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).
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 and electric control box.
8. Designation of parts
Nr.
Designation
12.01 Delivery casing
12.20 Screw
14.02 External jacket
14.20 O-ring
14.24 Screw
14.28 Square nut
14.29 Washer
14.54 Wear ring (1)
15.50 Suction strainer
25.01 First stage casing
25.02 Stage casing
25.05 Last stage casing
25.10 Washer for missing impeller
28.00 Impeller
28.04 Impeller nut
28.08 Washer
34.03 Oil chamber cover
36.00 Mechanical seal
36.51 Retaining ring, split
36.52 Shoulder ring
36.54 Spacer
64.15 Spacer sleeve
70.00 Motor cover, pump side
70.05 O-ring
70.09 O-ring
70.10 O-ring
70.12 Cable gland rubber ring
70.13 Washer
70.16 Cable gland
70.18 Screw
72.00 Upper mechanical seal
72.02 Circlip
73.00 Pump side bearing
76.01 Motor jacket with winding
76.60 Float switch
76.62 Jacket cover
78.00 Shaft with rotor packet
78.12 O-ring
81.00 Bearing
82.01 Motor end-shield, non-drive end
82.02 Screw
82.03 O-ring
82.04 Compensating spring
82.05 Screw
92.00 Tie-bolt
96.00 Cable
(1) Inserted in the stage casing, cannot be supplied separately
(2) Oil
Changes reserved.
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