Page 509
Cleanliness is imperative when working
with mechanical seals. Almost
unnoticeable particles between seal
faces can be, and often are, the cause
of early seal failures.
Check the impellers, they are designed
to float. They should move easily on
the shaft. As long as they can be
moved on the shaft by hand, they are
loose enough. If the impeller can be
rocked or wobbled, it is too loose and
must be replaced.
Check the sleeve or shaft for galling,
pitting, and corrosion. If the shaft or
sleeve is corroded where the seal
comes in contact with them, the shaft or
sleeve must be replaced. Surface
corrosion must be removed so that
seals can slide freely during assembly.
The shaft diameter should be no
smaller than .002" below the nominal
fractional seal sizes. Remove any
nicks or burrs which may have occurred
during disassembly. Reclean parts as
necessary.
4E Reassembly (C3 and P3)
All parts should be visually inspected and
cleaned or replaced as outlined in 4D
above.
1. The seal seat (#125) must be installed
in the motor bracket before the bracket
is installed on the motor. To install the
seat:
a. Place the motor bracket face up on
a flat surface.
b. Carefully press the seat, smooth
side up, into the seat cavity of the
motor bracket. To make the
installation of the seat easier, apply
a thin coating of compatible
lubricant to the elastomer portion of
the seat prior to installation. Care
must be taken not to damage the
seat face. Thumb pressure is
usually sufficient to install the seat.
2. Install the motor bracket.
a. Make sure the locking collar is
positioned on the motor shaft.
b. While holding the motor
bracket with the outlet port
facing up, install two of the
thru bolts into the motor face
to temporarily hold the motor
bracket in place.
c. Slide the bracket back until
the feet are resting against
the motor face. Light tapping
may be necessary to seat
the motor bracket in the
proper position.
3. Install the shaft sleeve and
rotating element as a unit.
a. Place the sleeve in an
upright position with the
smaller end facing up.
b. Lubricate the shaft sleeve
and rotating element.
c. Be sure to install a key
(#23A) in the motor shaft
before installing the sleeve
and seal assembly.
125
12
23
23A
19
7
11
2
60
15
14
1
Figure 4-5
17
C3
Figure 4-13
d. Holding the element
assembly between the thumb
and index finger of both
hands, refer to Figure 4-13,
slide the
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