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MPC Rev17 - Operating Instructions
Fig. 5 Dismantling (a) and remounting (b) the impeller
If it is not possible to hold or move the shaft with the
screwdriver, remove the fan cover (90.00) and motor
fan (88.00) and unscrew the impeller by gripping the
shaft with a suitable wrench.
With the impeller the rotating part of the mechanical
seal (36.00) will be removed.
8.4.
Assembling
To replace to mechanical seal (36.00) place the
rotating part of the seal on the impeller hub (28.00) and
push the spring right down as far as the front shoulder.
In this way, correct spring compression will be ensured
in subsequent assembly.
Lubricate the seal with water and align the impeller on
the motor shaft.
ATTENTION: with the three-phase models, to avoid
the unscrewing (and breaking) of the impeller
should the motor start rotating backwards,
clean
the threaded shaft end and apply on the irst half of the
threaded part Loctite 243.
If this type of product is not used, check the direction
of rotation before illing the pump (to avoid unscrewing
due to the resistant-force of the water in the case of a
backward rotation).
Grip the impeller with one hand and turn the shaft with
a screwdriver in the
clockwise
direction until tight.
With this operation the front surfaces of the mechanical
seal come into contact without rubbing against each
other during tightening (
ig. 5b
). Clean the O-ring
(14.20) and seal surfaces with water.
When replacing the motor assembly with the
impeller be careful to insert the locating lug inside
the pump casing (14.00) into the locating slot on
the diffuser cover (27.00) (ig. 6).
4.93.149
MPC
11, 21, 31, 41
MPC
51, 61, 71
14.00
14.20
32.00
27.00
14.00
27.00
Fig. 6 Locating lug/slot for assembling pump casing
(14.00) - diffuser cover (27.00).
ATTENTION
: to avoid leakage or failure due to
misalignment and localized overstressing, the screws
(14.24) with the nuts (14.28) must be uniformly
tightened with alternated crossover tightening in
diametrically opposed positions. Tightening torque for
screws (14.24): 7 Nm.
9. DISPOSAL
OFF
The inal disposal of the device must be done by
specialized company.
Make sure the specialized company follows the
classiication of the material parts for the separation.
Observe the local regulations and dispose the device
accordingly with the international rules for environment
protection.
10. SPARE PARTS
10.1.
Spare-parts request
When ordering spare parts, please quote their
designation, position number in the cross section
drawing and rated data from the pump name plate
(type, date and serial number).
The spare parts request shall be sent to CALPEDA
S.p.A. by phone, fax, e-mail.
11. ESIGNATION OF PARTS
Nr. Designation
14.00 Pump casing
14.14 Plug
14.15 O-ring
14.20 O-ring
14.24 Screw
14.28 Nut
14.29 Washer
15.00 Strainer cover
15.04 O-ring
15.12 Hand wheel
15.16 Square nut
15.50 Strainer basket
27.00 Diffuser cover
27.04 Diffuser funnel
27.08 O-ring
28.00 Impeller
28.12 Retaining ring
36.00 Mechanical seal
70.00 Lantern bracket
73.00 Ball bearing
73.08 V-ring, pump side
76.00 Motor casing with winding
76.16 Support
78.00 Shaft with rotor packet
81.00 Ball bearing
82.00 Motor end shield
82.04 Compensating spring
82.08 Screw
88.00 Motor fan
90.00 Fan cover
90.04 Screw
92.00 Tie-bolt
98.00 Terminal box cover
Changes reserved.
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