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MCHZ
7.7
7.7.1
7.7.2
7.7.3
7.7.4
MCHZ/EN (0912) 4.2
Disassembling the MCHZ(S)20a/b
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 (0350) and pull the gland (0170) backwards.
2 Remove the packing rings (0190) from the stuffing box. Use the special packing
puller for this, see figure 6.
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.
Replacing the mechanical seal MCHZS
If only a mechanical seal has to be replaced the pump will have to be disassembled first.
Then the relevant bearing housing will have to be removed. For this see paragraph 7.3.4
and paragraph 7.3.8. Then see paragraph 7.3.6 for disassembly of the mechanical seal.
Disassembling the MCHZ(S)
1 Uncouple the inlet and outlet pipes. Make sure that they are sufficiently supported.
2 Slacken the foundation bolts and remove the pump from the pipe work.
Disassembling the bearing housing on the drive side
1 Uncouple the coupling halve from the pump shaft (0550) and remove the key (0260).
2 Only for MCHZS: Slacken the balance pipe (0620).
3 Place the pump vertically in a support, with the shaft end up.
4 Remove the rubber V-ring (0310) and the bearing cover (0140).
5 Slide the inner rubber V-ring over the shaft and slacken the inner bearing cover
(0140). This is now free from the pump shaft.
6 Remove the outer external circlip (0290) and the filling ring (0160) from the pump
shaft.
7 Slacken the bolts (0360) and pull the bearing housing (0010) vertically from the
pump section. The bearing will be pulled from the pump shaft.
8 Remove the lower external circlip (0290) and the filling ring (0160) from the pump
shaft.
9 Remove the bearing cover and the rubber V-ring from the pump shaft.
10 Only for MCHZ: Disassemble the gland (0170).
Disassembly and assembly
41
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