FIGURE 1 - PUMP-CROSS SECTION WITH 56C
MOTOR FRAME
C A U T I O N
motor or frame shaft, it will be necessary to reposition the
pump shaft so that the impeller rotates freely inside the
pump case. With setscrews
(15)
loosened, determine the
full travel of the shaft; then place with the set screws. Be
sure that setscrews seat properly in motor shaft keyway.
Once setscrews are properly positioned, remove them
one at a time and apply Loctite #242 or similar medium
strength removable thread locking compound and reseat.
This will prevent the setscrews from vibrating loose and
damaging the pump.
Wipe the shaft clean, and give it a thin coating of light oil.
Slide the rotating portion of the assembly onto the shaft
with the carbon washer facing the ceramic seal in the
bracket. Be extremely careful when sliding the rubber
portion of the seal onto the shaft. Concentration of force
on the rubber surface can be facilitated by using a sleeve
which fi ts over the shaft, and butts up squarely against the
back of the seal assembly.
Once the seal assembly is on the shaft, the force required
to push it along the shaft is greatly reduced. Be sure to
anticipate this reduction so that the carbon washer will not
be fractured by being slammed against the seat face.
Before sliding the carbon washer up against the seat face,
make certain that the lapped faces are absolutely clean.
Place the seal spring in position. Apply Loctite #242 to the
stub shaft threads
(5)
and thread the impeller
(2)
clockwise on the shaft. Use moderate force in tightening
the impeller. The remaining components are then
assembled.
Number
Description
Number
Description
1
Casing
11
Casing capscrews
2
Impeller
12
Bracket
capscrews
3
Bracket
13
Vent plug
4
Mechanical seal
14
Drain plug
5
Coupling
15
Shaft setscrews
10
Casing gasket
2
3
4
5
11
12
13
14
15
1
PUMPS WITH JM FRAME MOTORS
To disassemble and reassemble pump, consult Fig. 2 for
identifi cation of components referenced by numbers.
Make sure power to the motor is
disconnected to prevent start-up or electrical shock.
Remove capscrews
(11)
which fasten bracket to casing.
Back out motor and bracket assembly from casing. The
gasket
(10)
will be reusable if it is not mutilated, however,
recommended practice is to install a new gasket each time
the pump is reassembled.
With the above assembly removed from the casing,
remove the impeller capscrew
(7)
and impeller washer
(8)
.
The impeller
(2)
can then be pried from the shaft. Remove
impeller key
(9)
.
The rotating assembly of the mechanical seal
(4)
can then
be pulled off the shaft sleeve
(5)
, or the rotating assembly
of the mechanical seal
(4)
and the shaft sleeve
(5)
can be
removed together from the motor shaft.
Pull the ceramic seal seat and the cup seat of the
mechanical seal out of the bracket
(3)
. If necessary,
remove the bracket
(3)
from the motor and press the cup
seat and the ceramic seat out of the bracket.
With the shaft sleeve
(5)
off the motor shaft, inspect the
sleeve o-ring
(6)
and the o-ring spacer sleeve
(6a)
. The
sleeve o-ring
(6)
may be reusable if it is not damaged;
however, recommended practice is to install a new O-ring
each time the pump is reassembled.
Lubricate the outside diameter of the new rubber cup seat
with light oil; press the cup seat with seal face into the
bracket
(3)
cavity, making certain that it is seated squarely
in the cavity.
If the seat and ring cannot be pressed into place with the
fi ngers, cover the lapped seat face with the cardboard ring
FIGURE 2 - PUMP CROSS SECTION WITH
JM MOTOR FRAME
1
7 8 9
2
10
4
11
3
12 5 6a
6
Number
Description
Number
Description
1
Casing
7
Impeller capscrew
2
Impeller
8
Impeller washer
3
Bracket
9
Impeller key
4
Mechanical seal
10
Casing gasket
5
Coupling
11
Casing capscrews
6
Shaft O-ring
12
Bracket
6a
Spacer sleeve
