EBARA EFQU4 - Manual (Page 32)

EBARA Fluid Handling 31
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).
STATIONARY SEAT
FULLY SEATED IN
SEAL PLATE BORE
SHEAR RING
(SHEARED)
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.
CAUTION!
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.
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,
remove the seal from the container, and remove the
Mylar storage tabs from between the seal faces.
CAUTION!
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).
O-RING ENGAGED
WITH SEAL PLATE
BORE
SHEAR RING
(UNSHEARED)
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.