Xylem MPAI - Manual (Page 95)

Installation, Operating and Maintenance Instruction
Model MP, MPA, MPAI
MP 100-english page 91 Revision 04
Article No 771074011 Issue 11/2011
If the whole pump is to be dismantled for maintenance
work, the pump should be placed in a vertical position
(intake pipe facing upwards). A workbench with a hole
(approx. 10 mm larger than the shaft) is very helpful in
such cases.
MPA 40, MPAI 40, MPA 65 and MPAI 65 can be
placed on the coupling protection adapter (95). Stand
MPA 100, MPAI 100 and MPA 125, MPAI 125
vertically with an additional support.
A hoist or a second person is required for dismantling
type MPA 100, MPAI 100 and MPA 125, MPAI 125
pumps.
Secure the pump so that it cannot fall over.
This description does not include dismantling
the mechanical seal. Read the instructions for
"Replacing the Shaft Seal" before dismantling
the pump in order to carry out any necessary
preparations in good time.
Loosen nuts (M1) and remove casing anchor (25).
Remove suction casing (3) and take out O-ring
(OR1).
Model MP:
Loosen impeller nuts (28), remove washer (29).
Model MPAI (Sizes 40.1 and 40.2)
Screw off the inducer (101), thereby fix the shaft
on the coupling against twist.
Model MPAI (Sizes 65.1, 65.2, 100.1, 100.2, 125.1
and 125.2)
Loosen impeller nuts (28), remove washer (29).
Remove the inducer (101) and take out the key
(PF5).
Dismantle impeller (1) and diffuser (2), take out
feather key (PF1). Mark all parts for assembly.
Remove inside bearing housing (54) and bearing
sleeve (23).
Dismantle pump in stages down to the pump
casing
Turn over the remaining part of the pump (bearing
flange (10) faces upward), axially secure shaft
(24) (use a support so that it cannot slip).)
Move back splash ring (73)
Unscrew nuts (M2) and nuts (M5), pull the bearing
cap (12) off the bearing flange (10).
Remove bearing flange (10) (lightly tapping the
bearing flange (10) facilitates removal)
Unscrew shaft nut (50) (sickle spanner), the shaft
nut has a securing device to prevent it from
coming loose.
If this securing device is no longer adequate, the
nut must be replaced.
Remove roller bearing (K1) with withdrawing
screw.
Remove spacer sleeve (72), bearing cap (12) and
splash ring (73), pull out feather key (PF3).
Removing the shaft seal: See "Replacing the
Shaft Seal".
Clean all parts. If the pump is to be reassembled
at a later date, carefully store all parts and protect
from corrosion.
8.8.2 Model MP (bearings on both sides)
See "Appendix" in Operating Instructions for sectional
drawing.
If the whole pump is to be dismantled for maintenance
work, the pump should be placed in a vertical position
(intake pipe facing upwards). A workbench with a hole
(approx. 10 mm larger than the shaft) is very helpful in
such cases.
MPA 40 and MP65 can be placed on the coupling
protection adapter (95). Stand MPA 100 and MPA 125
vertically with an additional support.
A hoist or a second person is required for dismantling
type MPA 100 and MPA 125 pumps.
Secure the pump so that it cannot fall over.
This description does not include dismantling
the mechanical seal. Read the instructions for
"Replacing the Shaft Seal" before dismantling
the pump in order to carry out any necessary
preparations in good time.
Move back the splash ring (73).
Unscrew nuts (M2) and nuts (M5), pull the bearing
cap (12) off the bearing flange (10).
Remove bearing flange (10) (tapping the bearing
flange lightly in an axial direction (10) facilitates
removal).
Unscrew shaft nut (50) (sickle spanner). The shaft
nut has a securing device to prevent it coming
loose. If this securing device is no longer
adequate, the nut must be replaced.
Remove roller bearing (K2) with withdrawing
screw.
Remove spacing washer (SS) and spacer sleeve
(72)
For removal of the shaft seal see: "Replacing
Shaft Seal".
Loosen nuts (M1) and remove casing anchor (25).
Remove suction casing (3) and take out O-ring
(OR1). Remove sleeve (38).
Remove impeller (1) and diffuser (2), take out
feather key. Mark all parts for assembly.
Remove stage casing (60).
Dismantle pump in stages down to the pump
casing
Turn over the remaining part of the pump (bearing
flange (10) faces upward), axially secure shaft
(24) (use a support so that it cannot slip).
Move back splash ring (73)
Unscrew nuts (M2) and nuts (M5), pull the bearing
cap (12) off the bearing flange (10).
Remove bearing flange (10) (lightly tapping the
bearing flange (10) facilitates removal)
Unscrew shaft nut (50) (sickle spanner). The shaft
nut has a securing device to prevent it from
coming loose.
If this securing device is no longer adequate, the
nut must be replaced.
Remove roller bearing (K1) with withdrawing
screw.
Remove spacer sleeve (72), bearing cap (12) and
splash ring (73), pull out feather key (PF3).