23
To check the shaft seal, proceed as follows:
1. Loosen and remove the clamp (pos. 92) holding
the pump housing and motor together.
2. Lift the motor part out of the pump housing
(pos. 50). The impeller is removed together with
the motor part.
3. Remove the screw (pos. 188a) from the shaft
end.
4. Remove the impeller (pos. 49) from the shaft.
5. Drain the oil from the oil chamber.
See section
.
The shaft seal is a complete unit for all pumps.
6. Remove the screws (pos. 188a) securing the
shaft seal (pos. 105).
7. Lift the shaft seal (pos. 105) out of the oil
chamber according to the lever principle using
the two dismounting holes in the shaft seal
carrier (pos. 58) and two screwdrivers.
8. Check the condition of the shaft where the
secondary seal of the shaft seal touches the
shaft. The bush (pos. 103) fitted to the shaft must
be intact. If it is worn and must be replaced,
the pump must be checked by Grundfos or
an authorised service workshop.
If the shaft is intact, proceed as follows:
1. Check/clean the oil chamber.
2. Lubricate the faces in contact with the shaft seal
with oil (pos. 105a) (O-rings and shaft).
3. Insert the new shaft seal (pos. 105) using the
plastic bush included in the kit.
4. Tighten the screws (pos. 188a) securing the shaft
seal to 16 Nm.
5. Fit the impeller. Make sure that the key (pos. 9a)
is fitted correctly.
6. Fit and tighten the screw (pos. 188a) securing
the impeller to 22 Nm.
7. Fit the pump housing (pos. 50).
8. Fit and tighten the clamp (pos. 92).
9. Fill the oil chamber with oil. See section
.
For adjustment of impeller clearance, see section
12.4 Adjustment of impeller clearance
12.8 Oil change
Every 3000 operating hours or at least once a year,
change the oil in the oil chamber as described below.
If the shaft seal has been changed, the oil must be
changed as well. See section
.
Draining of oil:
1. Slacken and remove both oil screws to allow all
the oil to drain from the chamber.
2. Check the oil for water and impurities. If the shaft
seal has been removed, the oil will give a good
indication of the condition of the shaft seal.
Oil filling, pump lying down:
1. Place the pump in such a position that it is lying
on the stator housing and the discharge flange
and that the oil screws are pointing upwards.
2. Fill oil into the oil chamber through the upper hole
until it starts running out of the lower hole. The oil
level is now correct.
For oil quantity, see section
3. Fit both oil screws using the packing material
included in the kit.
See section
.
Oil filling, pump in upright position:
1. Place the pump on a plane, horizontal surface.
2. Fill oil into the oil chamber through one of the
holes until it starts running out of the other hole.
For oil quantity, see section
3. Fit both oil screws using the packing material
included in the kit.
See section
.
Fig. 17
Oil filling holes
Note
Used oil must be disposed of in
accordance with local regulations.
Warning
When slackening the screws of the oil
chamber, note that pressure may have
built up in the chamber. Do not remove
the screws until the pressure has been
fully relieved.
Warning
When slackening the screws of the oil
chamber, note that pressure may have
built up in the chamber. Do not remove
the screws until the pressure has been
fully relieved.
Note
Used oil must be disposed of in
accordance with local regulations.
T
M
04
47
96
21
0
9
Oil filling
Oil level
