OM−00974
80 SERIES
MAINTENANCE & REPAIR
PAGE E − 9
Before installing the seal, lubricate the seal liner
with water or a very
small
amount of oil, and apply
a drop of light lubricating oil on the finished faces.
Slide the seal plate assembly over the impeller
shaft and temporarily secure the seal plate to the
pedestal (27) using two capscrews and nuts
(1/2−13 UNC x 1−1/2 inches long, not supplied).
Slide the inboard rotating element into the lubri-
cated seal liner with the chamfered side toward the
shaft sholder.
Subassemble the inboard stationary seat, packing
ring and stationary washer. Press this unit into the
lubricated seal liner until the seal faces contact. A
push tube cut from a length of plastic pipe would
aid this installation. The I.D. of the tube should be
approximately the same size as the I.D. of the seal
spring.
Slide the spacer sleeve onto the shaft until it seats
against the inboard rotating element and install the
seal spring.
Subassemble the outboard stationary seat, pack-
ing ring and stationary washer. Press this unit into
the lubricated seal liner. Install the outboard rotat-
ing element with the chamfered side
toward the
impeller
. Install the spacer washer (63).
Lubricate the seal assembly as indicated in
LU-
BRICATION
after the impeller has been installed.
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 (64) as
previously removed and screw the impeller onto
the shaft until tight.
Make sure the seal spring seats
squarely over the step on the back of the impeller.
The clearance between the back of the impeller
and the seal plate should be between 0.020 and
0.040 inch (0,51 to 1,02 mm). Measure this clear-
ance and add or remove shims from the impeller
adjusting shim set until the correct clearance is
achieved.
Pump Casing and Wear Plate Installation
If the wear plate (41) was removed, install the new
wear plate in the pump casing and secure it with
the hardware (43 and 44).
Remove the two capscrews temporarily securing
the seal plate to the pedestal. Install a new set of
casing gaskets (9) and slide the pump casing over
the impeller and against the gaskets. The clear-
ance between the face of the impeller and the wear
plate should be between .010 and .020 inch (0,25
to 0,51 mm). Remove gaskets from the gasket set
until the correct clearance is achieved. Secure the
pump casing to the seal plate and pedestal with
the nuts (40).
Suction Check Valve Installation
Inspect the check valve components and replace
them as required. Subassemble the check valve
weights (55 and 57) and gasket (56) using the at-
taching hardware (58 and 59).
Install the check valve assembly in the valve seat
(50). Replace the seat gasket (49), and secure the
valve seat to the suction port using the round head
machine screws (60). Replace the suction flange
gasket (51), and secure the suction flange (61) to
the seat with the nuts (53).
Check the operation of the check valve to ensure
proper seating and free movement.
Final Pump Reassembly
Be sure
all hardware and drain plugs are tight, and
that the pump is secure to the base and power
source.
Install the suction and discharge lines and open all
valves. Make certain that all piping connections are
tight, and that the weight of the lines is indepen-
dently supported and secure.
