Assembling The Mchz(S) 20A/B; Preparation For Assembly; Sub-Assembly Of Stage Casings; Pump Assembly - Johnson Pump MCHZ Instruction Manual

MCHZ
7.8
7.8.1
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7.8.2
7.8.3
MCHZ/EN (0912) 4.2

Assembling the MCHZ(S) 20a/b

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.

Sub-assembly of stage casings

Figure 14: Fitting the wear rings
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 14.
1 Fit the small wear rings (0580) into the covers (0510).
2 Fit a wear ring (0560) into the suction cover (0500).
3 Fit the wear rings (0560) and (0570) into the covers (0510).
4 Fit a wear ring (0570) into the pump cover (0050).

Pump assembly

1 Place a little Loctite 641 on the fitting face of the throttling bush (0100) and fit the
throttling bush into the pump casing (0020) for the drive side.
2 Fit the external circlip (0130) to the shaft (0550).
3 Fix the throttling sleeve (0110) to the shaft with a few drops of liquid locking agent.
4 Push the pump shaft (0550) with the drive side from the inside out through the
pressure bracket (0020).
Disassembly and assembly 43