Section
T51 • E51
Page 514
Dated
February 2014
Figure 4-17
assembly from the spring and
install it on the motor shaft.
Refer to Figure 4-14. This as-
sembly lifts out of the rotating
element spring.
d. After removal, apply a thin layer
of lubricant to the elastomer
portion of the seal.
e. Holding the head assembly
between the thumb and index
finger, with the sealing face
pointing toward the stationary
seat, slide the assembly over
the motor shaft until it rests
against the seat. Refer to
Figure 4-14. A slight twisting
motion will allow the assembly
to slide more easily.
f. Check to see that the head as-
sembly is against the seat face.
g. Position the rotating element
spring with the spring holder
resting against the shoulder of
the sleeve hub.
h. Align the keyway slot in the hub
assembly, and the key in the
motor shaft. Refer to Figure
4-15,
4. Install the impeller.
a. The impeller is a slip fit and
should slide on firmly but easily
until it stops against the impel-
ler wearing surface. Force
should not be required to install
the impeller in the correct posi-
tion.
b. The impeller hub should be
facing out away from the motor
bracket.
c. If the impeller does not fit,
repeat steps a. and b. to deter-
mine the problem.
5. Place “O” ring (#7) into the “O”
ring groove in the motor bracket.
It is helpful to stand the motor and
pump assembly on end for this
procedure.
6. Place the cover over the studs
and install the two (2) 3/8” nuts
and two (2) 3/8”x4” bolts. Tighten
the nuts and bolts, systematically
alternating diagonally across the
cover. Do not over-tighten the
nuts and bolts; final adjustment
will be made after the unit is in
operation.
4H Reassembly D3 (E51)
All parts should be visually inspected
and cleaned or replaced as outlined
in 4E above.
1. The stationary seat (#125) must
be installed in the motor bracket
before the bracket is installed on
the motor. To install the seat:
a. Place the motor bracket face up
on a flat surface.
b. To make the installation of the
seat easier, apply a thin coating
of compatible lubricant to the
elastomer portion of the seat
prior to installation.
c. Carefully press the seat,
smooth side up, into the seat
cavity of the motor bracket.
Care must be taken not to
damage the seat face. Thumb
pressure is usually sufficient to
install the seat.
2. Install the motor bracket.
a. While holding the motor bracket
with the outlet port facing up,
slide the bracket over the two
(2) studs (#18) on the motor
face.
b. Slide the bracket back until
the feet are resting against the
motor face. Light tapping may
be necessary to seat the motor
bracket in the proper position.
c. Install the four (4) “O” rings (#8)
on the two studs. This will help
hold the bracket in place during
the remainder of the assembly
operation.
3. Install the sleeve hub and rotating
element as a unit.
a. Place the sleeve in an upright
position with the smaller end
facing up.
b. Lubricate the motor shaft with
a small amount of glycol based
lubricant.
c. It is generally easier to remove
the entire head or sealing
Figure 4-15
Figure 4-16
Figure 4-14
i. Slide the hub and spring as-
sembly over the shaft until the
hub is properly seated and the
spring is positioned correctly on
the rotating element head previ-
ously installed. Refer to Figure
4-11 and 4-12.
j. While maintaining inward
pressure on the hub, install the
impeller nut. Refer to Figure
4-16.
k. Tighten the nut as far as pos-
sible by hand.
l. Pressure can now be released.
m. To tighten the nut, place a
crescent wrench over the hub
sleeve and engage the drive
key.
n. Place a second crescent
wrench over the nut and tighten
in a clockwise direction until it is
secured. Refer to Figure 4-17.
