OM--01970
T SERIES
MAINTENANCE & REPAIR
PAGE E -- 12
Figure 6. Seal Partially Installed
Continue to screw the impeller onto the shaft. This
will press the stationary seat into the seal plate
bore.
NOTE
A firm resistance will be felt as the impeller presses
the stationary seat into the seal plate bore.
As the stationary 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
7).
STATIONARY SEAT
FULLY SEATED IN
SEAL PLATE BORE
SHEAR RING
(SHEARED)
Figure 7. Seal Fully Installed
Measure the impeller-to-seal plate clearance, and
add or remove impeller adjusting shims to obtain
the proper clearance as described in
Impeller In-
stallation and Adjustment
.
If necessary to reuse an old seal
in an emer-
gency, carefully separate the rotating and station-
ary seal faces from the bellows retainer and sta-
tionary seat.
A new seal assembly should be installed
any time
the old seal is removed from the
pump. Wear patterns on the finished faces
cannot be realigned during reassembly.
Reusing an old seal could result in prema-
ture failure.
Handle the seal parts with extreme care to prevent
damage. Be careful not to contaminate precision
finished faces; even fingerprints on the faces can
shorten seal life. If necessary, clean the faces with a
non-oil based solvent and a clean, lint-free tissue.
Wipe
lightly
in a concentric pattern to avoid
scratching the faces.
Carefully
wash all metallic parts in fresh cleaning
solvent and allow to dry thoroughly.
Do not
attempt to separate the rotating
portion of the seal from the shaft sleeve
when reusing an old seal. The rubber bel-
lows will adhere to the sleeve during use,
and attempting to separate them could
damage the bellows.
Inspect the seal components for wear, scoring,
grooves, and other damage that might cause leak-
age. Inspect the integral shaft sleeve for nicks or
cuts on either end. If any components are worn, or
the sleeve is damaged, replace the complete seal;
never mix old and new seal parts
.
Install the stationary seal element in the stationary
seat. Press this stationary subassembly into the
seal plate bore until it seats squarely against the
bore shoulder. A push tube made from a piece of
