Multitech 1777.8/7-10 G3 - Manual (Page 18)

Multitec
18
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 or the
lantern:
- Undo both nuts 920.3 and pull gland cover 452 out of seal
housing 441.1.
- Remove packing rings 461.
7.3.4.1 Replacing the shaft protecting sleeve
- Remove the bearing as described in sections 7.3.3.1 and
7.3.3.2.
- Remove packing rings as described in section 7.3.4.1.
- On grease-lubricated pumps, pull V-ring 411.6 off spacer
sleeve 525.1.
- Remove O-ring 412.10.
- Pull off spacer sleeve 525.1.
- Remove bearing housing 350.1.
- Remove seal housing 441.1 with gland cover 452.
- Remove key 940.2.
- Take off sleeve 524 with a puller,
using the groove provided in the sleeve.
- Remove O-ring 412.4.
N.B.: If sleeve 524 is hard to remove, the balance drum can be
used for leverage.
- Remove balance drum 59-4, disc 550.3 and sleeve 524 with
a puller engaged in the threaded holes on the drum.
This is not possible on pumps without balance drum.
Fig. 30
Pump design without balance drum
Fig. 31
7.3.5 Dismantling the mechanical seal
7.3.5.1 Dismantling the mechanical seal
- Remove the bearing as described in sections 7.3.3.1 and
7.3.3.2.
- On grease-lubricated pumps, pull V-ring 411.6 off spacer
sleeve 525.1.
- Remove O-ring 412.10.
- Pull off spacer sleeve 525.1.
- Remove any auxiliary pipework (circulation, etc.),
depending on the pump version.
- Loosen the nuts 920.3 on the mechanical seal cover until the
spring is relaxed.
- Remove bearing housing 350.1.
- Take off mechanical seal cover 471.1 with the seat ring and
gasket 400.1, remove spring-loaded ring (not in case of
bellows-type seals).
- Remove key 940.2.
- Pull off sleeve 523.1 with the rotating assembly of the
mechanical seal. (Two holes are provided in the sleeve for
engaging a puller.)
- Take off seal housing 441.1.
- Remove O-ring 412.4.
Fig. 32