33
Inspect the seal components for wear, scoring, grooves, and other damage that might
cause leakage. 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 plastic pipe would aid this installation. The I.D. of the
pipe should be slightly larger than the O.D. of the shaft sleeve.
Slide the rotating portion of the seal (consisting of the integral shaft sleeve, spring
centering washer, spring, bellows and retainer, and rotating element) onto the shaft
until the seal faces contact.
Proceed with
Impeller Installation
and
Adjustment
.
Impeller Installation
(Figure 11, Page 23)
Inspect the impeller, and replace it if cracked or badly worn. Inspect the impeller and
shaft threads for dirt or damage, and clean or dress the threads as required.
Do not
attempt to separate the rotating portion of the seal from the shaft
sleeve when reusing an old seal. The rubber bellows will adhere to the
sleeve during use, and attempting to separate them could damage the
bellows.
CAUTION!
The shaft and impeller threads must be completely clean before
reinstalling the impeller. Even the slightest amount of dirt on the threads
can cause the impeller to seize to the shaft, making future removal difficult
or impossible without damage to the impeller or shaft.
CAUTION!
Install the same thickness of impeller adjusting shims as previously removed. Apply
Anti-Seize
or equivalent to the shaft threads and screw the impeller onto the shaft until
tight. Be sure the seal spring seats squarely over the shoulder on the back side of the
impeller.
NOTE:
At the slightest sign of binding, immediately back the impeller off, and
check the threads for dirt. Do not try to force the impeller onto the shaft.
A clearance of 0,64 to 1,02mm between the impeller and the seal plate is
recommended for maximum pump efficiency. Measure this clearance, and add or
remove impeller adjusting shims as required.
A new seal assembly should be installed
any time
the old seal is removed
from the pump. Reusing an old seal could result in premature failure.
CAUTION!
Handle the seal parts with extreme care to prevent damage. Be careful not to
contaminate precision finished faces; even fingerprints on 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.