Xylem LSNIH - Manual (Page 19)

Installation, Operating and Maintenance Instruction Model LSN
LSN 100-english page 17 Revision 01
Article No 771076024 Issue 01/2010
8.4 Removal of Impeller
Note attached "Mounting Instruction for Shaft
Sealing".
If the impeller has back vanes check the axial
clearance "a" between the impeller (230) and
casing cover (161) before you continue the
dismounting. Refer to sect. 8.7.1.
Loosen impeller nut (922) (right threaded) by fixing
the rotor at the coupling end.
Draw off the impeller (230) with two screw drivers
or pry bars (picture 10). Remove key (940.31).
pic 10
Be sure to locate pry bars under impeller vanes
to prevent damage to the impeller.
For further dismounting the Back Pull Out
Assembly should be placed in the vertical position
(with vertical shaft, see picture 11). Attention:
Precautions should be taken to prevent the Back
Pull Out Assembly from tipping!
pic 11
8.5 Removal of Shaft Sealing
Before you remove casing cover notice "Mounting
Instructions for Shaft Sealing".
Unfasten hexagonal nut (902.32) (not available on
all pump sizes) and take casing cover (161) out of
bearing bracket (344).
8.6 Removal of Bearing
Remove coupling with a coupling puller (picture
12), remove coupling key (940.52).
pic 12
Remove the flinger (507) axially by using 2 screw
drivers (see pic 13).
pic 13
Loosen hexagen head bolt (901.41). Remove the
bearing bracket lantern from bearing bracket
(330).
Dismount circlip (932.51). Therefore you need a
snap ring plier acc. to DIN 5256-C.
Bearing
bracket
required snap ring
plier
length i (min.) of
snap ring plier
24 size 94/C 40 200mm
32, 42 size 94/C 85 250mm
48 Größe 94/C 85 300mm
Remove shaft (210) including anti-friction bearing
(320.51 and 320.52) and bearing nut (923.51)
from the bearing bracket (330).
Remove the bearing nut (923.51). The bearing nut
is right hand threaded and self locking. It can be
reused 5 times if it is handled appropriately.
Remove the anti-friction bearing (320.51 and
320.52) from the shaft (210) using a hydraulic
press or a bearing puller.
8.7 Reconditioning
After disassembly all parts must be cleaned and
checked for wear carefully. Worn or damaged parts
must be replaced by new parts (spare parts).
When reassembling the pump it is recommended to
replace all seals.
All PTFE-sealing elements and graphite
sealings are intended for being used only once.