JS SERIES PUMPS
MR−03955
FM
APPROVED
MAINTENANCE AND REPAIR
PAGE C − 6
PUMP END DISASSEMBLY
References are to Figure C−1.
NOTE
The pump end components may be separated from
the motor without draining the oil from the motor.
If necessary to pry components apart to
separate them, use levers on both sides of
the component, and apply pressure even-
ly. Be careful not to mar mating surfaces.
When removing parts from the rotor/shaft
assembly, be careful not to mar the surface
or tapered end of the shaft.
Use a suitable lifting device to remove the pump
from the wet well, and position it horizontally on a
flat surface.
Loosening Impeller Capscrew
1. The impeller capscrew (10) should be loosened
before removing the volute casing (11). Block
impeller rotation by wedging a wood block or
soft brass bar into the impeller vanes through
the pump discharge.
2. Reach through the pump suction with a socket
wrench and loosen, but do not remove, the im-
peller capscrew (10). Remove the wood block
or brass bar and proceed as follows.
Removing Motor Assembly
1. Position the pump vertically, and remove the
screws (13) securing the motor assembly (1) to
the pump casing. Use the adjusting screws (74)
to jack the motor assembly out of the volute
casing . It is not necessary to remove the adjust-
ing screws unless replacement is required.
2. Use the lifting device to lift the motor assembly
and pump end components from the volute
casing. Re-position the pump horizontally on a
work bench or other suitable surface for further
disassembly.
3. If desired, remove the hardware (41), and sepa-
rate the guide shoe (38) from the volute casing.
Remove the rubber seal (31).
Removing Impeller
1. Remove the impeller screw (10).
2. To remove the impeller, use two screwdrivers to
apply equal pressure 180
_
apart to the back of
the impeller, and strike the end of the impeller
shaft sharply with a soft-faced mallet. Repeat as
necessary until the impeller comes free of the
shaft. Retain the impeller key (6).
Removing Seal Assembly
References are to Figure C−2.
To maintain peak operating efficiency, it is
strongly
recommended that the seal be
replaced if the pump is disassembled. In
the event that the seal will be reused, han-
dle seal parts with extreme caution to pre-
vent damage. Use care not to contaminate
the precision-finished faces; even finger-
prints on the faces can shorten seal life.
1. See
LUBRICATION
at the end of this section,
remove the lower (seal cavity) plug and O-ring
(268 and 269), and drain the oil from the seal
housing.
NOTE
Use caution in Step 2, tension on the seal clamp
springs will be released.
2. Loosen the retaining screws (266), and remove
the retaining ring (265).
3. Turn the seal spring to disengage it from the ro-
tating element, and remove the spring and
spring retainer.
4. Lightly oil the shaft and remove the seal rotating
element and O-ring.
5. Remove the locking ring (264) and seal clamp
(261) from the seal housing (257). Slide the low-
er seal stationary element off the shaft.
