8. Remove impeller from shaft, being careful
not to lose the impeller key, spring and seal
retainer. If impeller is difficult to remove, it
may be necessary to use a bearing puller to
remove.
9. Pry off rotating member of mechanical seal
from sleeve by using two (2) screwdrivers.
(Figure 3)
10. Remove bolts holding adapter to motor and
take off adapter.
11. Place adapter on a flat surface with case
rabbet facing down, and push out stationary
part of mechanical seal.
12. Inspect shaft sleeve, shaft O-ring and flinger.
If damaged or worn, remove and replace
with a new one.
B.) Reassembly:
CAUTION: The mechanical seal is a
precision product and should be handled
accordingly. Use care when handling lapped
running surfaces of the mechanical seal to
ensure they remain clean and are free of
chips or scratches.
1. Clean gasket and flange faces, seal seat
cavity, shaft sleeve, and motor shaft.
2. Position the stationary seat with the silver
dot down (away from you) and the lapped
face (shiny side) facing you. Lubricate the
seal seat cavity of the adapter and the rub-
ber cup or O-ring of seal seat with the lubri-
cating fluid that comes with the mechanical
seal or repair kit. Press the stationary seat
in seal seat cavity of the adapter squarely
and evenly using a arbor press (if possible)
and the cardboard disc supplied with the
seal. Be certain that the lapped face (shiny
side) is facing you.
3. Install the flinger on the motor shaft until it
bottoms on the motor shaft.
4. Slide the shaft O-ring on the motor shaft
until it is tight against the flinger. Make sure
that the shaft O-ring does not get damaged
during this procedure.
5. Position shaft sleeve chamfer towards
motor and slide on motor shaft.
6. With motor preferably in vertical position,
remount the adapter on motor, making sure
the motor shaft does not dislocate or chip
the stationary seat of the seal.
7. Apply the lubricating fluid that comes with
the mechanical seal or repair kit to the shaft
sleeve and the rubber bellows of the rotary
seal. Slide the seal head on the sleeve,
press the rubber drive band on the rotary
head until the lapped face on the head seats
firmly against the lapped face of the
stationary seat. Install seal spring on head
and seal spring retainer on spring. Do not
chip or scratch faces during installation.
Take extra care to make sure the lapped
faces are clean.
8. Place key in key seat. Line up keyway in
impeller with key on motor shaft, and slide
impeller on motor shaft. Be certain that the
key is positioned in the keyway of the motor
and impeller. Slightly compress seal spring
with impeller and hold impeller while
installing impeller retaining assembly in
motor shaft. (On 8716-8717 Models, reinstall
the diffuser with 10-24 nuts and #10 lock-
washers.)
9. Insert a screwdriver in a waterway passage
of the impeller holding it against rotation and
tighten impeller retaining assembly as
described in paragraph 7 of the disassembly
instructions. The impeller will compress the
seal spring to the proper length assuring the
correct pressure on the lapped surfaces.
10. Remove any burrs caused by screwdriver on
the vane of impeller in waterway passage.
11. Slide motor and rotating element in casing.
Be sure that any damaged O-ring or gasket
is replaced.
12. Tighten casing bolts alternately and evenly.
13. Replace hold-down bolts.
14. Check for free rotation after assembly is
completed.
15. Seal all drain openings, using pipe sealant
on threads.
16. Reprime before starting. Do not start unit
until pump is completely filled with water.
The approved lubricating fluid for seal
installation is included with the mechanical
seal or repair kit. DO NOT USE OTHER
LUBRICATING LIQUIDS!
WE RECOMMEND STOCKING A SPARE
MECHANICAL SEAL OR REPAIR KIT
TO ELIMINATE DOWN TIME.
MECHANICAL SEAL REPLACEMENT
CONT.
Figure 3
Figure 2
