Crane Crown B12 Series, Installation And Operation Manual

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9
Now assemble the spring and rotating portion of the seal
onto the impeller shaft (19). Lubricate the impeller shaft (19)
and the inside of the bellows each with 2 or 3 drops of SAE#
10 oil. Install this assembly into adapter (12), this may take
several minutes, therefore, oscillate the seal back and forth
on the shaft to make sure it does not stick to the shaft until
gage pin is in place and the clamp tightened.
If for any reason the gage pin does not give proper clearance,
quickly adjust the impeller clearance before the rubber
bellows seats on the shaft.
E-3) Impeller:
These pumps have their impellers threaded on with right
hand threads.
The clearance between an open faced impeller and its wear
surface in the volute is set at the factory at approximately
.015 inches. This clearance is re-adjustable by relocating
the shaft at the clamping arrangement. In cases where
much sand is being pumped, close clearances may bind
the impeller and volute and overload the motor. It may be
necessary to provide extra clearance on these.
When reassembling a dismantled pump, clean all parts and
especially areas where gaskets and o-rings are located.
Grease all gaskets and o-rings and areas where o-rings must
slide when assembling.
FIGURE 2
1 - Ni-Resist Stationary Seat
1A - Ceramic Stationary Seat
2 - Buna-N Seat Ring
2A - Buna-N Seat Cup
3 - Stainless Retainer
4 - Stainless Drive Band
5 - Stainless Spring
6 - Stainless Springholder
7 - Cran-Carb® Mating Ring
7A - Carbon Mating Ring
8 - Buna-N Bellows
Cross SEction of SEals.
Two Styles Shown
FIGURE 3