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7.3
7.3.1
28
Disassembling the MCHZ(S)12,5-14a/b-16
Make sure that the power supply to the pump is switched off and that no one
can switch the pump on again unintentionally!
If there is no illustration with the instruction, the item numbers used relate to the
illustrations in the parts list for this pump, in chapter 9.
Replacing the stuffing box packing MCHZ
If the pump has to be further dismantled then replacement of the packing rings will be
easier if the bearing housings (0010) are removed.
If only the packing rings have to be replaced then the pump does not need to be
disconnected from the pipe work and it can remain on the foundation. Proceed as
follows, this applies for both sides of the pump:
1 Remove the gland nuts (0280) and pull the gland (0120) backwards.
2 Remove the packing rings (0140) from the stuffing box. Use the special packing
puller for this, see figure 6.
Figure 6:
Removing stuffing box packing rings.
3 Clean the stuffing box and then grease it with graphite grease or silicone grease. Also
grease the new packing rings.
4 Bend open the first packing ring as shown in figure 7 and fit it around the shaft.
Thoroughly press the ring home using a suitable piece of halved tube.
5 Fit the other rings. Press these well home one by one. Ensure that the cuts are at 90°
with regard to each other.
6 Press the gland against the last packing ring and tighten the gland nuts one by one by
hand.
Figure 7:
Bending open of a stuffing box packing ring.
Disassembly and assembly
MCHZ/EN (0912) 4.2
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