Richter MNK-B Series - Manual (Page 17)

Series MNK-B, close-coupled design Page 17
9230-055-en Revision 09
TM 7345 Edition 10/2008
Push on bearing sleeve 529/2 on the rotor side
and install these units in the plain bearing pedestal
339.
Only push bearing sleeve 529/1 on the impeller
side partially onto the pump shaft 211.
Put impeller 230 onto the pump shaft 211.
Permit the anti-torsion cams of the impeller side
bearing sleeve 529/1 to engage in the grooves of
the impeller.
Screw on impeller together with bearing sleeve
and tighten.
7.8.3 Determine thicknesses S
1
and S
2
of
the distance washers 551.
9299-00-5053.4-01.1
Z
X
S
S
2
1
Adhesive
Adhesive
Fig. 6
The distances X and Z are given in the works
certificate. See sectional drawing in Section 9.
X: Distance behind the impeller
Z: Axial clearance of the plain bearings
Press inner magnet assembly in the direction of
the impeller.
Measure distance X
1
behind the impeller.
Press impeller in the direction of the motor.
Measure distance X
2
behind the impeller.
Thickness of the distance washer on the inner magnet
assembly side: S
1
= X
1
- X
Thickness of the distance washer on the impeller side:
S
2
= X - X
2
- Z
Example
Figures in the works certificate (mm): X = 2.0
Z = 0.4
Measurements during trial assembly : X
1
= 2.5
X
2
= 1.3
S
1
= X
1
– X = 2.5 - 2.0 = 0.5 mm
S
2
= X - X
2
– Z = 2.0 - 1.3 - 0.4 = 0.3 mm
7.8.4 Final assembly
Dismantle trial assembly and perform the final
assembly.
With the distance washers 551/1, 551/2 in the
calculated thickness
With the O-rings 412/3, 412/4
With distance ring 504
With 1 drop of adhesive on each shaft thread, e.g.
Loctite 243 from Loctite or an equivalent.
Only one drop of the adhesive is to be applied per
thread.
Otherwise the next dismantling operation will be more
difficult or no longer possible without destroying
components.
The plain bearing pedestal 339 is to be installed so
that the recesses for the anti-torsion insert of the
plain bearing bushes 545 are arranged in a vertical
position. This ensures that the flushing ducts in the
plain bearing and the flushing bores in the plain
bearing pedestal are located in the position
(horizontal) necessary for the pump to function.
To avoid mistakes, the correct 12 o’clock position
should be marked on the plain bearing pedestal
with a felt-tip pen prior to assembly of the impeller
and the inner magnet assembly.
Strong axial forces again arise when the
completely assembled plain bearing pedestal
is inserted into the lantern. Therefore, use a
Richter jig. See assembly aids in Section 10.2
Push the entire slide-in unit with housing gasket
401 into the housing 100 and screw together with
housing screws 901/3 and tightening washers
552/1.
The distance Y is also given in the works certificate.
See sectional drawing Section 9.
Y: Distance in front of the impeller
The distance is to be observed. You can exert an
influence on this with the thickness of the housing
gasket.
7.9 Tests
The pumps are tested with water at the
manufacturer's.
The operating data measured are documented in a
works certificate.
If, during a test after repairs, discrepancies compared
with the works certificate are discovered, the following
people can be called in:
1) in-house pump office
2) The manufacturer Richter
or its local agent
The following conveying data can be checked using
the pump performance curves:
Flow rate
Head
Power requirement
NPSHR