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Mounting Instructions MPE
Rotate shaft (24) to see that it runs smoothly.
The pump must be turned around for further assembly work (free shaft pointing upwards vertically)
Assembly as for dismantling the pump.
Lubricate shaft (24)
Check position of the impeller: Insert end diffuser (2/E), slide impeller (1) until impact.
The impeller is in the correct position when the impeller outlet channel lies within the diffuser intake
channel.
Avoid flow losses: Corrections can be carried out by adding compensation disks or by turning off the
impeller hub on the rear side. This check must be carried out at every stage.
If a pump is assembled with new impellers, care must be taken that the first and last stage is always
provided with an impeller with the full blade diameter. If only one impeller is available with the full blade
diameter it must be used as the first stage.
Please note that assembly work always starts with the final stage.
Remove impeller and diffuser once again, insert O-ring (OR2), re-insert end diffuser (2/E).
Insert key (PF1 or PF2) for the impeller that is to be mounted.
Mount impeller (1) As the O-ring (OR2) presses on the diffuser (2/E) the setting will not be correct at first.
Grease intensely O-ring (OR1) with silicon grease and fit it on the stage casing (60). Do not twist O-ring.
Place stage casing (60) on level and force down sharply. Hit with a plastic hammer until it impacts.
Assemble pump down to the suction casing (3)
Slide on sleeve (38), mount suction casing (3) with O-ring (OR1), take care that the nozzle positions are
correct.
Further assembly work depends on the type of the shaft seal. See chapter 2.3.
Assemble the bearings according to chapter 2.1 or 2.2 (Dismantling and mounting of the Bearings).
Important mounting tips:
All faces, sealing against an O-Ring, shall not show any scratch. Pay special attention at the sliding of the
impellers on the shaft.
The impellers have to stand axially with an accuracy of appr.
±
0,5 mm in der center of the diffuser
channel.
Brush the front faces of the impeller hubs with a liquid sealant (f.e. Hermetic) to eliminate internal flow in
the pump.
Brush the front faces of the stage casings with a liquid sealant (protection against corrosion).
Coat the threads of the tie roads (25) with MoS2-compound and tighten the nuts (M1) with the fastening
torque M.
Tighten constant in more steps on opposite sides alternate the nuts.
Fastening torque for cold water pumps (temp. to max. 80°C):
Pump type
MPE 100.x
MPE 125.x
Fastening torque M (dry)
455 Nm
785 Nm
Fastening torque M (lubricated)
410 Nm
710 Nm
The fastening torque specification for the tie roads of hot water pumps are shown in the instruction and
operation manual.
Slide on the coupling with the thread on the shaft front face. Do not strike it!
Check the smooth running before start-up. Check the alignment of the coupling and fill the bearing
brackets with oil.
Start-up according the IOM.
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