Replacing The Cable And Float Switch; Changing The Oil - Grundfos UNILIFT APG Service Instructions Manual

7.4 Replacing the cable and float switch

1. Loosen and remove the cable gland.
2. Loosen and remove the top cover screws (193).
3. Loosen the top cover with handle (190) and open it carefully.
4. Remove the plate (31).
5. Dismantle the cable plug, which is in focus (67a or 67b), and
remove the cable from the top cover.
6. Take the new cable and insert it through the top cover.
7. Before assembly, check the O-ring (157) and replace
if damaged.
8. Assembly the cable plug (67a or 67b).
9. Push back the plate (31).
10. Mount the top cover with handle (190).
11. Check the O-rings (194) on the screws (193) for damage, and
replace them if needed.
12. Mount the screws (193) and tighten according to the section
Torques and lubrication.
13. Grease the threads on the cable glands thread with Castrol
Optimol Paste.
14. Mount and tighten the cable glands accordingly.
Related information
6.4 Torques and lubricants
9. Drawings

7.5 Changing the oil

1. Loosen and remove 4 screws (26) and lift away the pump base
(84).
2. Use a plier to hold the grinder head and loosen and remove the
screw (188a) and the locking ring (66) in the shaft end.
3. Remove the grinder head (45).
4. Pull the impeller (49) away from the shaft.
Remember to remove and collect the key (9a).
5. Loosen and remove the screw (184b) and lift away the pump
housing.
6. Raise the pump so the shaft end faces upwards.
7. Unscrew and remove the oil plug.
Oil plug position
Pos. Description
A Oil plug
B O-ring
8. Tilt the pump to let the oil flow out of the oil drainage hole and
catch it in a tray.
Used motor oil must be disposed of in accordance with
local regulations.
9. Analyse the oil: If any particles of abrasive materials, for
example sand, or water are found in the oil, we recommend
you to check the condition of the mechanical seal and to have it
changed if necessary at a Grundfos Service Center. In this case
also change the oil with about 140 ml of oil, type MARCOL 152
ESSO.
10. Add oil using a funnel inserted in the drain hole. The total
amount of oil to use is 140 ml.
11. Mount and tighten the oil plug with a torque of 2.5 ± 0.2 Nm.
12. Reassembly the pump in the reverse order of the dismantling.
13. Adjust the impeller clearance.
A
B
11