Xylem MPAI - Manual (Page 91)

Installation, Operating and Maintenance Instruction
Model MP, MPA, MPAI
MP 100-english page 87 Revision 04
Article No 771074011 Issue 11/2011
8.3 Tools and Equipment
In normal cases no special tools are required.
The following tools simplify assembly work:
Warm-up equipment for roller bearings
Two-armed withdrawing screw
Sickle spanner for shaft nuts
Cleaning and degreasing agents (e.g. Acetone).
Lubricating agent for roller bearings (see Operating
Instructions for appropriate products).
Lubricating agent for assembly work (e.g. beef
dripping, Molikote, silicon grease and soap water).
For drinking water pumps only lubricants should
be used that are guaranteed to contain no
harmful substances.
8.4 Dismantling the Pump
Work may only be carried out while the pump is at a
standstill.
The pump must be shut down in accordance with the
Operating Instructions. For pumps with automatic
pump control appropriate measures must be taken to
prevent the pump from starting up accidentally (e.g.
cutting off the power supply).
Empty pump.
In the case of sizes MP, MPA 40 and 65,
emptying the pump over the drain holes (D)
provided will not completely empty the pump
cover. The pump can only be emptied
completely by turning it.
The operator's or manufacturer's fitters must be
informed about the nature of the pumping
medium. In the case of pumps that are operated
with hazardous materials, the pumping medium
must be disposed of in an environmentally
friendly manner before the pump is dismantled.
Please note that residues of pumping medium
are present even in pumps that have been
drained. If necessary the pump must be rinsed
or decontaminated.
Unscrew the pump from the pipe system and
base.
Disconnect pumps with standard couplings by
pulling apart the engagement.
Separate screwed coupling halves by unscrewing
the connector screws (see Coupling Operating
Instructions).
Transport to the workplace (see Transport,
Handling in the Operating Instructions).
8.5 Replacing Roller Bearings
This section describes how to replace roller bearings.
Clean and check condition of all parts that have been
removed. In case of doubt, components should be
replaced. Wearing parts and seals must always be
replaced.
If parts or half-open pumps are to be stored for any
length of time, they must be protected from dirt and
corrosion.
8.5.1 Intake Side Roller Bearings (K2), (Suction
Side) – MP only
See the "Appendix" in the Operating Instructions for
relevant sectional drawing.
Dismantling
Place the pump in a horizontal position, raise the
suction casing (3) with wooden blocks so that the
feet of the bearing flange (10) are exposed by
approx. 10 to 20 mm.
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 bearings (K2) 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 new bearing (K2) (max. 80°C) and slide
onto the shaft (24).
Tighten the shaft nut (50) while the bearing is still
hot, then turn back a ¼ turn.
Fill approximately 60% of the space in the roller
bearing (K2) with grease (when the bearing has
cooled down).
Fit 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 (73) into position (nut 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.
8.5.2 Discharge Side Roller Bearing (K1), (delivery
side)
See the "Appendix" in the Operating Instructions for
relevant sectional drawing.
Dismantling
Remove coupling halves with withdrawing screw.
Place the pump in a horizontal position, raise the
suction casing (4) with wooden blocks so that the
feet of the bearing flange are exposed by
approximately 10 to 20 mm.
Move back the splash ring (73)
Unscrew nuts (M2) and nuts (M5), pull the bearing
cap (12) off the bearing flange (10).