Assembling The Stage Set - Johnson Pump MCHZ Instruction Manual

7.8.7
46

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 (0600) and place the suction cover (0060). This is pressed over the
throttling sleeve (0100).
3 Fit a key (0660) to the pump shaft and fit the air wheel (0070) to the shaft. Fit the
external circlip (0130) to the shaft.
4 Fit the gasket (0600) and fit the pump cover (0050). Make sure the gasket is in
the correct position!
5 Fit a key (0660) in the pump shaft and fit an impeller (0520), the inlet opening of the
impeller must point up.
6 Fit the gasket (0600) 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 (0130) to the pump shaft.
9 Fit a gasket (0600) and place the suction cover (0500) on the stage set.
10 Fit a gasket (0600) into the inlet casing using assembly grease. Place the pump
casing suction side (0020) over the shaft end on the stage set.
11 Fit the tie rods (0670 and 0680) with the nuts (0690).
12 For the remaining operations see paragraph 7.8.4. With the exception of the following
points:
• The set ring must be fitted with a distance of 8 mm between the top of the set ring
and the edge of the stuffing box in the pump casing.
• Steps 9 and 10 of paragraph 7.8.6 replaced by: Fit the closed bearing cover (0150).
13 Fit the by-pass pipe (0650) if present.
Disassembly and assembly
MCHZ/EN (0912) 4.2