Xylem IM138 R01 HMC Close-Coupled Centrifugal Pump - Manual (Page 4)

4
a) Franklin motors:
Remove motor shaft end cap. Insert a
screwdriver in slot of motor shaft. While
holding shaft from rotation, unscrew impeller
from shaft by turning counter-clockwise
when facing it. To loosen three phase and
metal impellers, use a torch to apply heat
to exposed shaft thread and impeller hub, as
locking compound was used to secure
impeller in place.
b) A.O. Smith motors:
Remove motor end cover. Insert 7 ⁄
16
” open end
wrench under switch mechanism onto flats
on motor shaft. While holding shaft from
rotating, unscrew impeller from shaft.
Heat may be required as indicated in 7a.
8. Pry off rotating member of mechanical seal
from shaft by using two (2) screwdrivers
(Fig. 1).
Figure 1
9. Remove bolts holding adapter to motor.
10. Place adapter on a flat surface. Push out
stationary parts of mechanical seal (seat and
rubber mounting cup).
B) Reassembly:
1. Clean gasket and flange faxes, male and
female locks, seal seat counterbore and shaft,
and in particular the shaft shoulder fitting
against impeller.
2. Lube counterbore of adapter and rubber
bushing of stationary seal with water or light
oil. Press stationary seat in counterbore
squarely and evenly. Caution: Do not mar the
lapped face of seat.
3. Remount adapter on motor. Make sure motor
shaft does not dislocate stationary seat of
the seal.
4. Apply a thin coat of light oil or water to
motor shaft and the rubber seal member of
seal. Slide rotating member of mechanical
seal on motor shaft. Be sure rotating seal face
stays in holding collar during installation.
Take extra care not to damage the seal
lapped faces.
5. Spray both shaft and metal impeller threads
with LOCQUIC ® , Primer “T” - Loctite ® product
Item No. 74756. (Purchase at Automotive
Parts or Hardware). Let parts dry and then
apply Loctite ® #271 on same parts.
6. Hold shaft from rotating as described in
paragraph 7 of Dismantling. Thread impeller
on shaft until it is tight against shaft
shoulder.
7. Apply locking compound and replace
impeller nut. Hold impeller from rotating as
indicated in paragraph 6 of dismantling.
8. Remove burrs caused by screwdriver on
periphery of impeller in waterway passages.
9. Replace motor and rotating element in
casing. Be sure to install new gasket.
10. Tighten casing bolts alternately and evenly.
11. Replace hold-down bolts.
12. Check for free rotation after assembly is
complete.
13. Replace hold-down bolts.
14. Close all drain openings. Use pipe joint
compound on male threads.
15. Reprime before starting. Do not start unit
until pump is completely filled with water.