English
30
WILO SE 10/2013
CAUTION! Risk of material damage!
Danger of damage due to incorrect handling.
• When changing the mechanical seal, you also have to replace the
radial bearing.
• Remove the rotating part of the mechanical seal (105b) from the shaft
by loosening the set screws (hexagon socket).
• Separate the lantern (5b) from the motor flange and remove the static
part of the mechanical seal (105a) together with the seal rings (413a
and 413b).
• Clean all the components, tight seats and sealing surfaces thoroughly
and check for wear.
9.2.2
Installation
To assemble the unit, follow the dismantling steps in reverse order.
NOTE
If the pump has been dismantled, it is a good idea to replace the bear-
ing, mechanical seal and seal rings with new parts.
NOTE
When tightening screw connections in conjunction with the work
described in the following: Observe the screw tightening torque for
the thread type (see section “Screw tightening torques” on page 14).
NOTE
If you replace the mechanical seal, comply with installation dimension
L2 as per fig. 3.
NOTE
If it is not possible to check dimension L2 using standard measuring
means, you have to determine dimension L1 on the old part from the
shaft end to the mechanical seal. Then transfer this dimension L1 to
the new part so that you can then install the mechanical seal on the
new shaft.
Screw tightening torques
Fig. 9:
Motor power
P
2
< 1 kW
P
2
1 kW
P
2
4 kW
L1 [mm]
107 ± 0.3
129 ± 0.3
129 ± 0.3
L2 [mm]
52 ± 0.6
52 ± 0.6
62 ± 0.6
L3 [mm]
37 +0.7/-0.6
37 +0.7/-0.6
37 +0.7/-0.6
Screw connection
Tightening torque
Nm ± 10 %
Installation
instructions
Heat sink — pump housing
M6x25
M8x30
25
35
-
Lantern — heat sink
M6x20
25
-
Lantern — motor
M8x40
M8-8 nut
Washer
25
-
M12x50
M12-8 nut
Washer
60
-
Impeller — shaft
M8 nut
M12x1.25 nut
M8 screw
25
60
12
-
