Assembling The Mechanical Seal Mchzs - Johnson Pump MCHZ Instruction Manual

7.6.5
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Assembling the mechanical seal MCHZS

A mechanical seal is a vulnerable precision component. Leave the seal in the
original packaging until you start with the actual assembly. Ensure that the
working environment is dust free and that the parts and tools are clean.
Remove any paint from the components. Never place the slide rings on the
slide surfaces!
1 Fit the set ring (0190) and lock this with the adjustment screw (0330).
The distance mj from the top of the set ring to the bottom of the external circlip
groove must be 54 mm.
2 Before fitting check whether the grooves for the external circlips (0220) have any
sharp edges.
3 Wet the clean shaft with some low-surface-tension water (add detergent) and feed
the bellows part of the seal (0160) with a slight twist in clockwise direction onto the
shaft. Apply pressure or tension during assembly via the rear end of the
spring only. The sliding surface must face towards the shaft end, drive side.
4 Wet the seal chamber with some low-surface-tension water (add detergent) and fit
the static ring of the mechanical seal (0160) into the seal cover (0090), with the
sliding surface pointing out.
5 Fit the gasket (0140) and fit the cover (0090) into the pressure bracket.
6 Proceed with paragraph 7.6.6.
Disassembly and assembly
MCHZ/EN (0912) 4.2