EBARA EFQT8 - Manual (Page 31)

EBARA Fluid Handling 30
Seal Installation
(Figures 2 and 5)
Clean the seal cavity and shaft with a cloth
soaked in fresh cleaning solvent.
WARNING!
Most cleaning solvents are toxic and flammable.
Use them only in a well-ventilated area free from
excessive heat, sparks, and flame. Read and
follow all precautions printed on solvent
containers.
Te seal is not normally reused because wear
patterns on the finished faces cannot be realigned
during reassembly. This could result in premature
failure. If it is necessary to reuse an old seal in an
emergency, carefully wash all metallic parts in fresh
cleaning solvent and allow to dry thoroughly.
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.
Inspect the seal components for wear, scoring,
grooves, and other damage that might cause
leakage. Clean and polish the shaft sleeve, or
replace it if there are nicks or cuts on either end. If
any components are worn, replace the complete
seal; never mix old and new seal parts.
CAUTION!
If a replacement seal is being used, remove it from
the container and inspect the precision finished
faces to ensure that they are free of any foreign
mater.
To ease installation of the seal, lubricate the O-rings
and seal sleeve with water or a very small amount of
oil, and apply a drop of light lubricating oil on the
finished faces. Assemble the seal as follows, (see
Figure 5).
After the bearings have been installed and
allowed to cool, check to ensure that they have
not moved away from the shaft shoulders in
shrinking. If movement has occurred, use a
suitable sized sleeve and a press to reposition
the bearings against the shaft shoulders.
If heating the bearings is not practical, use a
suitable sized sleeve and an arbor (or hydraulic)
press to install the bearings on the shaft.
CAUTION!
When installing the bearings onto the shaft,
never press or hit against the outer race, ball, or
ball cage. Press only on the inner race.
Secure the outboard bearing on the shaft with the
bearing retaining ring (14).
Slide the shaft and assembled bearings into the
bearing housing until the retaining ring on the
outboard bearing seats against the bearing
housing.
CAUTION!
When installing the shaft and bearings into the
bearing bore, push against the outer race. Never
hit the balls or ball cage.
Press the outboard oil seal (13) into the bearing
cap (10) with the lip positioned as shown in figure
2. Replace the bearing cap gasket (9), and
secure the bearing cap with the hardware (15 and
16). Be careful not to damage the oil seal lip on
the shaft keyway.
Impeller shaft endplay should be between .002
and 0,010 inch (0.051 to 0.254 mm). Tighten the
bearing cap hardware tight enough to prevent
leakage and obtain the correct endplay. Do not
over-tighten.
Lubricate the bearing housing as indicated in
LUBRICATION.