32
Lubricate the external stationary seat O-ring with light oil. Slide the seal assembly onto
the shaft until the external stationery seat O-ring engages the bore in the seal plate.
Clean and inspect the impeller as described in
Impeller Installation and Adjustment
.
Install the full set of impeller shims provided with the seal, and screw the impeller onto
the shaft until it is seated against the seal (see Figure 15 below).
Continue to screw the impeller onto shaft. This will press the stationary seat into the
seal plate bore.
NOTE:
A firm resistance will be felt as the impeller presses the stationery seat
into the seal plate bore.
As the stationery seat becomes fully seated, the seal spring compresses, and the shaft
sleeve will break the nylon shear ring. This allows the sleeve to slide down the shaft
until seated against the shaft shoulder. Continue to screw the impeller onto the shaft
until the impeller, shims, and sleeve are fully seated against the shaft shoulder (see
Figure 16 above).
Measure the impeller-to-seal plate clearance, and remove impeller adjusting shims to
obtain the proper clearance as described
Impeller Installation
and
Adjustment.
If necessary to reuse an old seal
in an emergency, carefully separate the rotating and
stationary seal faces from the bellows retainer and stationary seat.
Figure 15. Seal Partially Installed
O-RING ENGAGED
WITH SEAL PLATE
BORE
SHEAR RING
(UNSHEARED)
To ease installation of the seal, lubricate the shaft sleeve O-ring and the external
stationary seat O-ring with a very small amount of light lubricating oil. See Figure 14,
page 30 for seal part identification.
Slide the tube over the shaft threads, and then slide the O-ring off the end onto the
shaft. Remove the tube, and continue to slide the O-ring down the shaft until it seats
against the shaft shoulder.
When installing a new cartridge seal assembly
, remove the seal from the container,
and remove the Mylar storage tabs from between the seal faces.
New cartridge seal assemblies are equipped with Mylar storage tabs
between the seal faces. These storage tabs must be removed before
installing the seal.
CAUTION!
Figure 16. Seal Fully Installed
STATIONARY SEAT
FULLY SEATED IN
SEAL PLATE BORE
SHEAR RING
(SHEARED)