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7.6.7
7.6.8
40
Assembling the stage set
1 Fit the sub-assembly which you have just assembled with the shaft vertically, drive
side down. Use a support for this with an opening to provide space for the shaft end.
2 Fit a gasket (0660) and place the suction cover (0040). This is pressed over the
throttling sleeve (0060).
3 Fit a key (0730) to the pump shaft and fit the air wheel (0050) to the shaft. Fit the
external circlip (0100) to the shaft.
4 Fit the gasket (0180) and fit the pump cover (0530). Make sure the gasket is in
the correct position!
5 Fit a key (0730) in the pump shaft and fit an impeller (0520), the inlet opening of the
impeller must point up.
6 Fit the gasket (0660) and fit a stage casing (0510) on the pressure bracket.
7 Repeat steps 5 and 6 until the last impeller has been fitted.
8 Secure the impeller set by fitting an external circlip (0100) to the pump shaft.
9 Fit a gasket (0660) and place the suction cover (0500) on the stage set.
10 Fit a gasket (0660) to the inlet casing using assembly grease. Place the inlet casing
(0030) over the shaft end on the stage set.
11 Fit the tie rods (0740) with the nuts (0750).
12 For assembly of the other seal see paragraph 7.6.4 to paragraph 7.6.5. With the
exception of the following point:
• The value mj from step 1 of paragraph 7.6.5 now becomes 18,7.
Assembling the bearing construction on the suction side
1 Fit the rubber V-ring (0250) over the pump shaft, with the narrow opening pointing to
the inside of the pump.
2 Fit the bearing cover (0120) to the inside of the small bearing housing (0010).
3 Fix the bearing housing (0010) to the pressure bracket with the bolts (0300).
4 Fit the external circlip (0230) into the inner of the 2 grooves on the pump shaft and fit
a filling ring (0110).
5 Fit the bearing (0210) using a suitable mounting bush which rests on both the inner
and outer rings of the bearing.
6 Fit the second filling ring (0110) and fit the external circlip (0230) onto the pump
shaft.
7 Fit the outer bearing cover (0130).
8 Fit the by-pass pipe (0670) if present.
Disassembly and assembly
MCHZ/EN (0912) 4.2
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