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Under normal conditions, a grease cup full of grease will last three to four months. If a grease seal requires
grease every day, and it is not leaking past the outer lip seal it indicates that the seal is wearing out. The
internal pressure of the pump will often force the cup plunger out when the seal leaks badly.
E-2) Shaft Seal Replacement:
All parts of the pump are easily dismantled by simply removing nuts and screws. Rotating parts of the shaft
seal grip the shaft by friction and may be frozen to the shaft through long usage.
If the mechanical shaft seal is not leaking and it is necessary to dismantle part of the pump for inspection
or cleaning DO NOT disturb the shaft seal other than its spring if the impeller is removed. Once a shaft seal
has been in operation it cannot be removed and replaced without leaking.
It is recommended to remove the pump side from the support bracket. After the pump has been
disassembled make sure that the shaft and seat areas in the pump side are as clean as possible. The shaft
must not be sharp, but neatly rounded and polished to a 1/32" radius. This radius and the shaft, on which
the rubber bellows grips, must be polished with 180 to 240 grit emery cloth. The seal will install relatively
easy if the shaft is properly polished.
Install the seat assembly (1 and 2 or 1A and 2A, see Figure 2) in pump side adapter (12) using SAE#90 oil
on the rubber parts. They may install easier by first inserting the rubber part and then sliding the seat part
into the rubber. All of this must be done with the fingers only.
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.
CAUTION !
HANDLE PARTS WITH EXTREME CARE.
DO NOT SCRATCH OR MAR LAPPED SURFACES.
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 - Crane-Carb® Mating Ring
7A- Carbon Mating Ring
8 - Buna-N Bellows
Cross Section of Seals.
Two Styles Shown.
9
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