MR−05740
PA SERIES PUMPS
MAINTENANCE & REPAIR
PAGE C − 17
IMPELLER
SHAFT
IMPELLER
SHIMS
O-RING
IMPELLER
SPRING
CENTERING
WASHER
SPRING
RETAINER
SHAFT
SLEEVE
STATIONARY
SEAT
BELLOWS
SEAL PLATE
SHAFT
SLEEVE
O-RING
Figure C−8. Seal Assembly
This seal is not designed for operation at
temperatures above 160
_
F (71
_
C). Do not
use at higher operating temperatures.
Lubricate the stationary seat O-ring with water or
light oil. Press the stationary seat into the seal plate
(20) until fully seated.
Position the seal plate over the shaft and secure it
to the bearing housing (4) with the hardware (18
and 19).
Be careful
not to damage the stationary
seat on the shaft threads.
Lubricate a new seal plate O-ring (35) with grease
and install it in the groove in the seal plate.
Lubricate the shaft sleeve O-ring (28) and position
it over the last thread on the impeller shaft.
Use
caution
not to cut the O-ring on the threads.
Slide the shaft sleeve (30) onto the shaft until the
O-ring is fully seated in the undercut. Continue to
press the sleeve onto the shaft until fully seated
against the shaft shoulder.
Lubricate the O.D. of the seal sleeve with a
small
amount of light oil. Slide the rotating subassembly
(consisting of rotating element, bellows and re-
tainer), onto the sleeve until the seal faces contact.
Install the seal spring and centering washer. Lubri-
cate the seal as indicated in
LUBRICATION
after
the impeller is installed.
Impeller Installation And Adjustment
(Figure C−5)
Inspect the impeller (1) 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
