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MCHZ
7.6
7.6.1
!
7.6.2
7.6.3
7.6.4
MCHZ/EN (0912) 4.2
Assembling the MCHZ(S)14a/b heavy bearing construction
Preparation for assembly
For the correct torque settings see paragraph 10.4 "Tightening moments for bolts and
nuts" and paragraph 10.5 "Tie rod torque".
For the correct lubricants and locking agents see paragraph 10.6 "Post-greasing of ball
bearings" and paragraph 10.7 "Recommended locking liquids".
For assembly all relevant parts should always be clean and undamaged. Leave
bearings and seals for as long as possible in the packaging. If the bearing
does not need to be replaced the bearing and the bearing housing will have to
be cleaned and provided with new grease. The bearing at the non-drive end is
a 2RS1 type bearing and does not require any maintenance.
Sub-assembly of stage casings
Use a suitable assembly bush for inserting the wear rings. The flat side of the wear rings
must be positioned equally with the flat side of the cover, see figure 8.
Steps 2 and 3 are only applicable for design Q (= with bronze impellers)
1 Fit the small wear rings (0590) into the covers (0510).
2 Fit a wear ring (0580) into the suction cover (0500).
3 Fit the wear rings (0580) and (0610) into the covers (0510).
4 Fit the wear rings (0610) into the pump cover (0530).
Pump assembly
1 Place a little Loctite 641 on the fitting face of the throttling bush (0060) and fit the
throttling bush into the pump casing (0030) for the drive side.
2 Fit the external circlip (0100) to the shaft (0570).
3 Fix the throttling sleeve (0600) to the shaft with a few drops of liquid locking agent.
This throttling sleeve is used from 8 stages and higher.
4 Push the pump shaft (0570) with the drive side from the inside out through the
pressure bracket (0030).
Assembling the stuffing box packing MCHZ
Figure 12:
Bending open a stuffing box packing ring.
1 Fit the 5 packing rings. Place the packing rings with the openings offset. The packing
rings may only be bent open axially, see figure 12.
2 Fit the gland (0140). Tighten the nuts (0290) by hand.
3 Proceed with paragraph 7.6.6.
Disassembly and assembly
37
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