Multitec
Individual seal components such as O-rings made of EPDM must
never come into contact with oil or grease.
The mechanical seal shall be re-assembled in the reverse
sequence of dismantling.
When mounting the seat ring, the shaft sleeve may be wetted
with clean medium handled to reduce the friction forces.
The seat ring and the spring-loaded ring shall always be mounted
by hand resp. fingers, making sure that pressure is applied
evenly, without tipping.
Horizontal baseplate - mounted pumps
On pump versions C and D, the rotational direction
has to be observed for mechanical seals fitted with
uni-directional springs.
Fig. 7.4-3
7.4.3.1 Leakage at the Mechanical Seal
- Check axial alignment of the seal.
- Check gasket 400.01.
- Remove seal cover 471.1 (471.2 for bellows seal) and check
position of seat ring in the cover.
- Check the O-ring on shaft sleeve 523.1.
- Check O-ring 412.4.
7.4.4 Bearings
Plain bearings
In installation types A, B, E, Ex, F, Fx, V, Vx are re-installed in
reverse order to dismantling.
Rolling element bearings
The rolling element bearings are generally mounted on a bearing
sleeve and tightened with the shaft nut 920.2 / 920.6 / 920.7.
They are re-installed in reverse order to dismantling.
Check the concentricity and face run-out of ring 500.1 with a dial
gauge for variants with oil lubrication.
Sealing elements
Sealing elements made of EPDM must never come into contact
with oil or grease.
Defective O-rings (which have sustained mechanical damage
such as cuts, cracks and deformation as well as changes in
properties from deposits or embrittlement) must be replaced. New
gaskets shall be used whenever the pump is re-assembled.
If possible, sealing elements shall be mounted without the use of
mounting aids like grease or adhesives, unless authorised
mounting aids are used.
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