7 Servicing/Maintenance
53 of 80
Vitacast / Vitacast Bloc
7.4.2 Preparing the pump set
1. De-energise the pump set and secure it against unintentional start-up.
2. Reduce pressure in the piping by opening a consumer installation.
3. Disconnect and remove all auxiliary pipework.
7.4.3 Removing the complete pump set from the piping
1. Disconnect the discharge nozzle and suction nozzle from the piping.
2. Depending on the pump size and motor size, unscrew the bolts that fix the
support foot or motor foot to the foundation.
3. Remove the complete pump set from the piping.
Alternative: Leave pump casing 101 installed in the piping. Undo clamping piece
81-44. Pull the remaining back pull-out unit out towards the back (back pull-out
design).
7.4.4 Removing the pump casing and impeller
1. Undo clamping piece 81-44.
ð
On Vitacast 150-125-350 and Vitacast 200-150-350 pump casing 101 is
screwed on. In this case, undo studs 902.1 and nuts 920.1 instead of clamping
piece 81-44.
2. Carefully take off pump casing 101.
3. Undo impeller nut 922 by turning it anti-clockwise.
ð
For versions with inducer 236, instead of impeller nut 922 turn inducer 236
anti-clockwise and remove it.
4. Remove impeller 230.
5. Remove key 940.1.
6. Remove spacer discs 551.1.
ð
On some types of mechanical seal the spacer discs are located behind the
shoulder of the rotating ring of the seal. Remove the spacer discs together
with the seal.
7.4.5 Removing the mechanical seal
7.4.5.1 Seal type T, operating modes B and I
161
433.1
Fig. 11:
Removing the
mechanical seal
ü
The pump casing and impeller have been removed.
1. Remove the primary ring of mechanical seal 433.1.
ð
Turn the spring clockwise.
ð
Pull the spring together with the seal off shaft 210.
2. Gently remove casing cover 161.
3. Press the mating ring of mechanical seal 433.1 out of casing cover 161.
