Gorman-Rupp Pumps T10A61S-B /FM - Manual (Page 35)

OM-05444 SUPER T SERIES
MAINTENANCE & REPAIR PAGE E - 13
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 end 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 about the same as the I.D. of the
seal spring.
Slide the rotating portion of the seal (consisting of
rotating element, bellows and retainer) onto the
shaft until the seal faces contact.
Install the seal spring. Lubricate the seal as indi­
cated in LUBRICATION after the impeller is in­
stalled.
Proceed with Impeller Installation and Adjust­
ment.
Impeller Installation and Adjustment
(Figure E‐2)
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.
The shaft and impeller threads must be
completely clean before reinstalling the im­
peller. 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 im­
peller or shaft.
Install the same thickness of impeller adjusting
shims (31) as previously removed. Apply `Never‐
Seez' or equivalent compound to the shaft threads
and screw the impeller onto the shaft until tight. Be
sure the seal spring seats squarely over the shoul­
der on the back side of the impeller.
NOTE
At the slightest sign of scraping, immediately back
the impeller off, and check the threads for dirt. Do
not try to force the impeller onto the shaft.
A clearance of .020 to .025 inch (0,51 to 0,64 mm)
between the impeller and the wear plate is recom­
mended for maximum pump efficiency. Measure
this clearance, and add or remove impeller adjust­
ing shims as required.
NOTE
If the rotating assembly has been installed in the
pump casing, this clearance may be measured by
reaching through the priming port with a feeler
gauge.
After the rotating assembly is installed in the pump
casing, coat the threads of the impeller capscrew
(25) with `Never‐Seez' or equivalent compound,
and install the impeller washer (24) and capscrew;
torque the capscrew to 90 ft. lbs. (1080 in. lbs. or
12,4 m. kg.).