EBARA EFQT3 - Manual (Page 32)

EBARA Fluid Handling 32
Slide the tube over the shaft threads, and
then slide the O-ring off the and 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, removes the seal from the
container, and removes 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.
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 6).
Figure 6. Seal Partially Installed
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 7).
Figure 7 – Seal Fully Installed
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.
A new seal assembly should be installed any
time the old seal is removed from the pump.
Wear patters on the finished reassembly.
Reusing an old seal could result in
premature failure.
Handle the seal parts with extreme care to
prevent damage. Be careful not to
contaminate precision finished faces; even
fingerprints on the faces with non-oil based
solvent and a clean, lint-free tissue. Wipe
lightly in a concentric pattern to avoid
scratching the faces.
CAUTION!
CAUTION!
O-RING ENGAGED
WITH SEAL PLATE
BORE
SHEAR RING
(UNSHEARED)
STATIONARY SEAT
FULLY SEATED IN
SEAL PLATE BORE
SHEAR RING
(SHEARED)