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7.5.5
7.5.6
7.5.7
7.5.8
7.5.9
7.5.10
36
Disassembling the ball bearings
1 Remove both internal circlips (0240) from the bearing bracket.
2 Using a suitable bush, resting on the outer ring of the bearing, press the bearings out
of the bearing bracket.
Disassembling the mechanical seal MCHZS
1 Remove the seal cover (0090) from the pump shaft and remove the static ring from
the mechanical seal.
2 Slide the rotating ring for the mechanical seal (0160) off the pump shaft.
If the reason for disassembly was to replace the mechanical seal, the new mechanical
seal can now be fitted. See from paragraph 7.6.5 for this.
Disassembling the set of stage casings
1 Uncouple the balance pipe (0670) if fitted.
2 Only for MCHZS: Slacken the adjustment screw (0330) and remove the set ring
(0190).
3 Unscrew the nuts (0750) from the tie rods (0740).
4 Remove the pump casing (0030) from the stage set. Using a suitable bush, press or
tap the throttling bush (0060) out of the inlet casing.
5 Remove the external circlip (0100) and any throttling sleeve (0600) from the pump
shaft.
6 Remove the end cover (0040) and the air wheel (0050). Remove the key (0730) from
the shaft and remove the gasket (0180).
7 Remove the pump cover (0530) and remove the external circlip (0090).
8 Remove all impellers (0520), stage casings (0510) and keys (0730).
9 Remove the suction cover (0500) from the pump casing (0030).
Disassembling the bearing housing on the suction side
1 Position the pump casing with the shaft horizontally.
2 Remove the rear bearing cover (0130).
3 Continue from step 5 of paragraph 7.5.4.
Disassembling the ball bearing on the suction side
See paragraph 7.5.5, with the exception of step 1.
Disassembling the mechanical seal on the MCHZS suction side
See paragraph 7.5.6, for which item no. (0160) now becomes: item no. (0150).
Disassembly and assembly
MCHZ/EN (0912) 4.2
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