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7.4.7
34
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 (0030). This is pressed over the
throttling sleeve (0070).
3 Fit a key (0730) to the pump shaft and fit the air wheel (0040) to the shaft. Fit the
external circlip (0090) to the shaft.
4 Fit the gasket (0160) 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 (0090) 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
(0020) over the shaft end on the stage set.
11 Fit the tie rods (0740) with the nuts (0750). For MCHZ(S) 12.5 x 1-3, MCHZ(S)
14a/b x 1-3 and MCHZ(S) 16 x 1: fit the bolts and nuts (0770).
12 For the remaining operations see paragraph 7.4.4. With the exception of the following
points:
• The value mj from step 1 of paragraph 7.4.5 is replaced by the value mh, for which
the correct values are shown in the table below:
Pump type
MCHZS 12,5 x n - 3,2
MCHZS 14 a x n - 5
MCHZS 14 b x n - 5
MCHZS 16 x n - 6,5
Figure 11:
Distance mh.
• Steps 9 and 10 of paragraph 7.4.6 replaced by: Fit the closed bearing cover (0120)
13 Fit the by-pass pipe (0670) if present.
Disassembly and assembly
mh (=non-drive side)
20,2
18,7
18,7
14
MCHZ/EN (0912) 4.2
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