7 Servicing/Maintenance
57 of 72
Sewatec (60 Hz)
Size
Impeller type
Thread
Tightening torque
[ft lbs]
[Nm]
250 - 400
K
M 20
213,90
290
250 - 401
K
M 20
213,90
290
250 - 403
K
M 20
213,90
290
300 - 400
K
M 20
213,90
290
300 - 401
K
M 20
213,90
290
Note:
Make sure that the tapered fit of impeller and shaft is undamaged and installed free
from grease.
For pump size Sewatec D 150-251 first screw screwed coupling 852 into the shaft.
7.5.5 Installing the back pull-out unit
WARNING
Back pull-out unit tipping over
Risk of squashing hands and feet!
▷
Suspend or support the bearing bracket at the pump end.
Version with casing wear ring
ü
The shaft, rolling element bearings, mechanical seal and impeller have been
assembled properly.
502
904.01
101
230
0.02 inch
(0,5 mm)
Fig. 29:
Fitting the casing
wear ring
1.
Insert casing wear ring 502 into pump casing 101.
2.
Glue 3 pieces of cardboard
8)
of approximately 0.079 inch (2 mm) thickness and
0.59 inch (15 mm) length to the front face of the impeller.
ð
In assembled condition, this will result in a clearance of 0.02 inch (0.5 mm).
between impeller and casing wear ring.
3.
Insert the complete back pull-out unit into the pump casing.
4.
Screw in grub screws 904.01, lock the casing wear ring in position.
5.
Secure grub screws 904.01 with Loctite.
6.
Evenly tighten screwed connection 902.01 between pump casing and bearing
bracket.
NOTE
Only adjust the clearances for bearing bracket versions S01, S02 and S03. Bearing
bracket S04 has a diametral clearance.
Version with wear plate (for D impellers only)
ü
The shaft, rolling element bearings, mechanical seal and impeller have been
assembled properly.
ü
The pump casing is not connected to the piping.
8)
Use cardboard which easily dissolves in water.
