Maintenance
38 EN
04/2019
8.4.6 Dismantling the impeller and mechanical seal
NOTICE
Normblock Multi:
When dismantling the impeller and the
mechanical seal we recommend taking the whole pump out of the
piping system and dismantling the pump housing.
BADU Block Multi:
When dismantling the impeller and the
mechanical seal we recommend taking the whole pump out of the
pre-filter housing or taking the whole motor unit out of the pump
housing.
1.
Loosen the coupling protection (681) from the drive lantern
(341).
2.
Hold the pump shaft (210) at the opening. See "Fig. 8" on
page 40
3.
Loosen the impeller nut (922) with the inserted o-ring (412.4).
4.
Remove the impeller (230). Place the impeller on a clean and
level surface.
5.
Remove the shaft key (940) from the shaft key nut.
6.
Remove the rotating insert in the mechanical seal (433) from
the impeller hub.
7.
Loosen hexagon screws (901).
8.
Loosen the gland housing (161) from the lantern (341).
9.
Remove
the
counter
ring in the mechanical seal (433) from
the gland housing (161).
8.5 Assembling
pump/unit
8.5.1 Pre-requisites
Assemble using the exploded drawing attached.
Check O-rings, renew if necessary.
Tighten screws according to the torque indicated. See point
8.6 on page 41
Clean
dismantled
components and check them for wear.
Replace with original spare parts if necessary.
Sealing surfaces are clean and free of grease.
