RDLO
Page 17 of 24
7.5 Instructions for Replacement of
Assemblies / Parts
7.5.1 Replacing the Shaft Seal
Gland Packing
See the relevant instructions in sections 7.3 and
7.4.
Mechanical Seal
Prior to replacing the mechanical seal, the bearing
housings including the rolling elements and the
coupling must be removed. Refer to sections 7.3,
Dismantling, 7.4 Reassembly, and the operating
instructions of the mechanical seal in section 9.5.
7.5.2 Replacing the Casing Wear Rings and /
or Impeller Wear Rings
For the impeller clearance please refer to the
technical data sheets of the pump in section 9.2.
After dismantling as described in section 7.3.2, the
casing wear rings (502) can be removed. When
fitting the rings, make sure that their bezels are on
the outside (towards the bearing).
The impeller wear rings (503, optional) were shrink-
fitted on the impeller neck and, in addition, fixed
with two grub screws, see assembly instruction.
If the impeller has not been fitted with a wear ring at
the factory, and replacing of the casing wear ring
alone does not lead to a value near the required
impeller clearance (the impeller neck is badly worn
by clearance flows), the impeller neck can be
turned down in order to fit an impeller wear ring
(available as spare part).
Alternatively, a new impeller can be supplied.
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