Section
T51 • E51
Page 515
Dated
February 2014
1. The seal seat (#125) must be
installed in the motor bracket (#1)
before the bracket is installed on
the motor. To install the seat:
a. Place the motor bracket face up
on a flat surface.
b. Apply a coating of compatible
lubricant to the elastomer
portion of the seat to aid with
installation.
c. Carefully press the seat,
smooth side up, into the seat
cavity of the motor bracket.
Thumb pressure is usually
sufficient to install the seat.
2. Install the motor bracket. This is
best done with the motor standing
on end. Make sure that both the
face of the motor and the feet of
the motor bracket are clean. Slide
the motor bracket over the shaft
onto the motor.
3. Install the rotating element (#12).
Lubricate I.D. of the rotating
element. Place the rotating
element on the shaft with the
carbon end towards the seat.
Place the spring over the shaft,
with the backing plate up and
compress the spring to locate the
rotating element against the seat.
If this fails to seat the rotating
element gently push the rotating
element down with a thin blade
screwdriver being careful not to
damage the seat or the rotating
element.
4. Compress and hold the seal
spring slightly below the snap ring
groove and install the snap ring
(#4). Make sure the snap ring is
locked in the groove.
5. Install the impeller key (#23) into
the shaft keyway.
6. The impeller is a slip fit and
should slide on firmly but easily
until it stops against the impeller
wearing surface. Force should
not be required or used to install
the impeller in the correct position.
The impeller hub should be facing
out away from the motor bracket.
Refer to Figures 4-4 and 4-5.
7. Next, rotate the impeller by hand,
the impeller should move freely.
8. Place the large “O” ring (#7) into
the outside “O” ring groove in the
motor bracket.
9. Place the cover over the motor
bracket and install the two (2) nuts
(#20) and the two (2) 3/8”x4” bolts.
Tighten the bolts systematically,
alternating diagonally across the
cover. Do not over-tighten the
bolts. Final adjustment will be
made after the unit is in operation.
4I Testing and Final Adjustment
The pump is now ready for installa-
tion. Final adjustments will be made
with the pump in operation.
1. Reconnect the electrical connec-
tions referring to the colored or
numbered tape used to mark the
wires during disassembly.
2. Connect all piping and fill the
pump with fluid.
3. Make sure all valves are open,
and fluid will flow through the
system.
4. Start the pump and make the final
adjustments to the 3/8” nuts and
bolts holding the cover on. These
nuts and bolts must be torqued to
20 ft. lbs. to obtain proper perfor-
mance.
5. Check for leaks on pump and pip-
ing. Special attention should be
given to the seal area at the rear
opening in the motor bracket.
6. Under pressure, the impeller will
find its “hydraulic” balance.
7. Using an amprobe or similar de-
vice, check for motor overload.
8. While the impeller is seating, it is
common to experience some vari-
ance in readings. After a run-in
period the readings should level
off.
This completes the adjustment and
testing phase. The pump is ready for
service.
