Xylem MPAI - Manual (Page 92)

Installation, Operating and Maintenance Instruction
Model MP, MPA, MPAI
MP 100-english page 88 Revision 04
Article No 771074011 Issue 11/2011
Remove bearing flange (10) (lightly tapping the
bearing flange (10) facilitates removal).
After the bearing flange (10) has been removed
the shaft can be moved freely in an axial
direction (approx. 3 – 4 mm). Standard shaft
seals can absorb this adjustment without their
function being impaired. In the case of special
shaft seals (e.g. cartridge seals) please follow
the Operating Instructions of the seal.
Unscrew shaft nuts (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 bearings (K1) with the withdrawing
screw.
Check the surface of the shaft for damage, grind
away any furrows.
Assembly
•
Clean and lubricate the fitting surfaces between the
bearing flange (10) and suction casing (3).
• Preheat the new bearing (K1) (max. 80°C) and slide
onto the shaft (24).
(Variants):
MP, MPA 40 and 65 ........roller
bearing (K1) – double row angular
ball bearings (single bearing)
MP, MPA 100 and 125 ....roller
bearing (K1) – paired angular ball
bearings in X arrangement
Paired angular ball bearings in X arrangement
Tighten shaft nut (50) while the bearing is still hot.
Fill approximately 60% of the space in the roller
bearing (K1) with grease (when the bearing has
cooled down).
Mount bearing flange (10) and screw on lightly for
the time being.
Screw the bearing cap (12) to the bearing flange
(10).
Grease the counter contact surface of the splash
ring packing washer on the bearing cap (12).
Bring the splash ring into position (73) (groove in
the spacer sleeve (72)).
Align the bearing surface of the pump feet (place
pump on an even surface).
Tighten nuts (M2) firmly (see Supplementary
Sheet for torque).
Rotate shaft (24) to see that it runs smoothly.
Mount coupling half (maybe preheat to approx.
80°C).
8.6 Replacement of the slide bearing
This section describes the replacement of the slide
bearing in the inner bearing casing (54 – MPA, MPAI
design).
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 MPA 65 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.
See the "Appendix" in the Operating Instructions for
relevant sectional drawing.
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.
Dismantling
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.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
key (PF1).
Remove inside bearing housing (54) and bearing
sleeve (23).
Inspect the shaft for surface damage, grind off any
remaining furrows.
Remove the bearing bush (21) from the suction
casing (3) (screw off).
Assembly
Press the new bearing bush (21) into the inner
bearing casing (54).
Clean the fitting surfaces between the inner
bearing casing (54) and the suction casing (3) and
coat them with lubricant.
Slide the new bearing sleeve (23) onto the shaft
(24).
Insert the key (PF1), install the diffuser (2) and
impeller (1).
Model MP:
Slide on the impeller (1) with washer (29).
Tighten the first impeller nut (28), then turn it back
approx. ¼ turn, secure with the locknut.