3200-632
Aug, 2001
Cornell Pump Company
DISMANTLING THE MECHANICAL SEAL Page 2 of 2
If seal is to be removed, remove the impeller according to the instructions for dismantling the pump. The
rotating portion of the seal may now be seen. Slide off the seal spring. Lubricate the shaft and remove the
reminder of the rotating portion being careful to avoid damaging the primary seal. The rubber bellows will be
firmly attached to the shaft and considerable pressure will be required to remove it.
REMOVING SEAT
If the seal is being replaced, remove gland and press out the stationary seat. For pumps with double seals
remove the seat from the stuffing box also.
INSTALLING THE MECHANICAL SEAL
Clean all parts of the pump before starting reassembly. Special attention should be given to the backplate and
the impeller hub.
- Clean and lubricate the shaft.
- Install the stationary seat in the backplate.
- Oil the outer surface of the seat and the “O” ring with a light oil (not grease). Place a cardboard disc on the
sealing face to avoid damage. Press the seat into the gland or stuffing box using firm steady pressure. Make
sure the seat is all the way in. Slide the gland with the gasket over the shaft.
- Wipe the lapped sealing faces of the seat and the primary seal perfectly clean. Use extreme care to avoid
marking the sealing face or the primary seal. Slide the rotating portion of the seal, including spring on the
shaft.
CAUTION: Once the rotating portion has been placed on the shaft, the rest of the installation must be made at
once. Delay may result in the rubber bellows seizing on the shaft in the wrong position.
Install the impeller. For pumps with Cycloseal, be sure that the spring slides over the impeller hub and pushes
against the backshroud of the impeller (on some Cycloseal models, a spring retainer or spacer is used to hold the
spring. Refer to pump sectional drawing)
BACKPLATE
IMPELLER
ROTATING ELEMENT SPRING
Typical assembly for Cycloseal pumps
O-RING SEAT
SHAFT SLEEVE
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