Multitec

7.3.4Dismantling 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.

7.3.4.1Replacing 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

18

7.3.5Dismantling 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

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Image 18
Multitech 1777.8/7-10 G3 operating instructions Replacing the shaft protecting sleeve

1777.8/7-10 G3 specifications

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