Multitec
7.3.3.2 Dismantling the Drive-End Rolling Element
Bearings
N.B. : The ceramic plain bearing installed at the non-drive end
need not be dismantled in order to remove the drive-end rolling
element bearings. If the pump is oil lubricated, the oil must be
drained before dismantling.
- After loosening the grub screw in the coupling hub pull out
coupling half with key 940.3.
- Remove joint ring (V-ring) 411.7 (only for grease-lubricated
version).
- Undo bolt 901.1 (for grease-lubricated version)
- Loosen bolts 901.8 and pull out together with washer 550.10
and O-ring 412.12 (for oil-lubricated version).
- Remove bearing cover 360.1 or 360.2, depending on the pump
version.
- Remove sleeve 5220.4 with ring 500.1 (tolerance ring) and
O-ring 412.11 (only for oil-lubricated version).
The rotating unit is adjusted axially by means of spacers 551.1.
When reassembling the pump after partial dismantling (bearing
or seal modification), the same spacer discs 551.1 must be
mounted on the side of the bearing to reproduce the original rotor
adjustment (see also Section 7.4.4).
- Undo nut 920.2 with lockwasher 931 or nut with locknut 920.6,
depending on the pump version. To undo the nut, hold onto
shaft with key 940.3.
- Pull off shaft protecting sleeve 520.1 with rolling element
bearing 320.1 (The shaft is centered in the sleeve without
locking device.)
- Remove spacers 551.1, see text above.
N. B.: In the version V, Vx, E, Ex, F, Fx of sizes 32, 50, 65 the
pump does not have a fixed bearing as this function is being
taken over by the motor bearings. In the version Multitec V100,
V125 and V150 the fixed bearing is located in the support lantern
342. Dismantling and installation are the same as for the horizontal
versions.
Fig. 7.3-6
Grease lubrication Oil lubrication Design version V, Multitec 100/125
(only grease lubrication)
7.3.4 Dismantling and Replacement of Shaft
Seal
Gland Packings
7.3.4.1 Replacing the Packing Rings
Access to packing rings without removing the bearing of the
lantern :
- Undo both nuts 920.3 and pull gland cover 452 out of seal
housing 441.1.
- Remove packing rings 461.
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