d. Install one (1) “O” Ring (#8)
on each of the four guide
rods. This will help hold the
bracket in place during the
remainder of the assembly
9. On inducer pumps (L50 Series)
install one Snap Ring (#14A) in
the groove nearest the drive end
of the Shaft (#17), and slide the
Seal Driver (#88) on the shaft.
10. Install the Shaft (#17) and Seal
Rotating Element (#12) as a unit.
a. Lubricate the small end of
the shaft and the rotating
assembly between the thumb
hands, slide the assembly
over the shaft until the spring
shoulder. Refer to Figure
c. The element must slide freely
up and down the shaft. It is
necessary to maintain some
element because the spring
tension could dislodge the
seal portion of the element.
d. Slide the shaft into the taper
Bearing frame shaft. Push
e. While maintaining inward
pressure on the shaft with
one hand, insert the Bearing
Frame Thru Bolt (on units on
a bearing frame) or a 3/8-16
bolt of the appropriate length
coupled models) into the hole
of the bearing frame shaft/
adapter shaft. Thread the
bolt into the pump shaft. You
f. Insert 3/8” hex wrench into
the socket in the pump shaft
and hold while tightening the
bolt, drawing the two shafts
11. Look at the pump shaft between
the Endbell (#101) & Inlet Cover
(#1 or #1IN). There should be
a scribed line around the shaft
visible. This line is used to set
the proper seal working height. It
should line up with the machined
surface of the Inlet Cover where
the shaft goes through. If the line
is not visible or does not line up
properly, the shaft can be moved
by tightening or loosening the
Bearing Adjusting Nuts (#110
& #110A) using the adjustable
spanner wrench. Once the proper
location is established, both
Bearing Adjusting Nuts must be
tightened against the bearing.
For standard (M50 Series) pumps, skip
12. For inducer (L50 series), install the
Inducer Impeller (#11IN). Refer
to the L50 Inducer Stage Inset in
a. Install an Impeller Key (#23)
in the shaft by the drive collar.
b. Slide the inducer impeller on
the shaft with the eye facing
c. Install the other Snap Ring
(#14A) on the shaft at the hub
13. Install the Diffuser Ring (#9IN).
a. Place an “O”Ring (#7) on
the raised step in the diffuser
ring. You will need to stretch
the “O”ring slightly to do so.
b. Coat the “O”ring and the lip
inside the inlet cover with a
small amount of glycol base
c. With the “O”ring facing the
inlet cover, slide the diffuser
ring onto the guide rods so
that it fi ts over the inducer
impeller. Push on fi rmly until
the “O” ring fi ts inside the lip
in the inlet cover. Refer to
14. Installation of the First Stage
a. Place the small “O”Ring
(#7A) in to the groove in the
hub of the Inlet Cover (#1
- 1IN) or Diffuser Ring (#9IN).
b. Install an Impeller Key (#23)
b. Place an “O” ring (#7) on the
raised step in the channel
ring. You will need to stretch
the “O” ring slightly to do so.
c. Coat the “O” ring and lip in
inlet cover (or diffuser ring)
with a small amount of glycol
d. With the “O”ring facing the
motor end, slide the channel
ring onto the guide rods with
up. The large inlet opening
should be on the same side
as the pump inlet. Refer to
fi gure 4-15. Push on fi rmly
until the “O”ring fi ts inside
the lip in the inlet cover (or
diffuser ring). Refer to Figure
15. Slide an Impeller (#11) on the
shaft and over the drive key, with
the impeller hub facing the motor.
16. Install a Right Hand Channel Ring
a. Place an “O”Ring (#7) on the
raised step in the channel
ring. You will need to stretch
the “O”ring slightly to do so.
b. Coat the “O”ring and lip in
previous ring with a small
c. With the “O”ring facing the
left hand channel ring, slide
the channel ring onto the
guide rods. The small outlet
same side as the pump inlet.
Refer to Figure 4-16. Push
on fi rmly until the “O” ring fi ts
inside the lip in the left hand
channel ring. Refer to Figure
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