OM−00877
80 SERIES
MAINTENANCE & REPAIR
PAGE E − 9
This seal is not designed for operation at
temperatures above 160
_
F (71
_
C). Do not
use at higher operating temperatures.
If the seal plate (34) was removed, lay it on a flat
surface with the impeller side facing up. Lubricate
the stationary seat O-ring with light oil and press
the stationary seat into the seal plate bore until fully
seated.
Slide the assembled seal plate and stationary seat
over the impeller shaft (26) and temporarily secure
the seal plate to the pedestal (18) using two cap-
screws and nuts (1/2 UNC X 1 1/2 inch long, not
supplied).
Lubricate the O.D. of the shaft sleeve (13) with wa-
ter or a very
small
amount of oil, and slide the rotat-
ing portion of the seal assembly onto the shaft
sleeve until the face of the rotating element is
just
flush
with the chamfered end of the sleeve.
Slide the assembled seal and sleeve onto the shaft
until the seal faces contact. Continue to press the
shaft sleeve through the rotating portion of the seal
until it is fully seated against the shaft shoulder.
Install the seal spring and spring seat (12).
Impeller Installation
Inspect the impeller, and replace it if cracked or
badly worn.
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 shims (11) as
previously removed, and screw the impeller onto
the shaft until tight.
A clearance of .015 to .020 inch (0,38 to 0,51 mm)
between the impeller and the seal plate is neces-
sary for maximum pump efficiency. Measure this
clearance and add or remove impeller shims until
this clearance is reached.
NOTE
Be sure the seal plate is tight against the pedestal
while measuring this clearance.
After the back clearance is set, secure the impeller
with the hardware (37, 38 and 39).
Pump Casing and Wear Plate Installation
If the wear plate assembly (36) was removed, posi-
tion the replacement wear plate assembly squarely
against the casing shoulder and secure it with the
mounting hardware (57, 58, 43 and 44). Replace
the fiber washer (43) if badly worn or compressed.
Remove the two capscrews temporarily securing
the seal plate to the pedestal. Install a new set of
casing gaskets (35) and slide the pump casing
over the impeller and against the gaskets. The
clearance between the face of the impeller and the
wear plate should be between .008 and .015 inch
(0,20 to 0,38 mm). Remove gaskets from the gas-
ket set until the correct clearance is achieved. Se-
cure the pump casing to the seal plate and pedes-
tal with the nuts (33).
Secure the pump casing to the base with the pre-
viously removed hardware. Be sure to reinstall any
leveling shims used under the mounting feet of the
pump casing.
If a lifting eye was used to move the pump casing,
be sure
to remove the lifting eye from the pump
casing.
Do not attempt to lift the complete pump
unit using the lifting eye. It is designed
to facilitate removal or installation of in-
dividual components only. Additional
weight may result in damage to the
pump or failure of the eye bolt.
