Power-Flo Pumps & Systems • 877-24PUMPS • www.powerfl opumps.com
10
Inspect motor winding for shorts and
check resistance values. Check rotor for
wear. If rotor or the stator windings are
defective, the complete motor must be
replaced.
Bearings & Inner Seal -
Remove seal (4)
rotating member and spring from rotor
shaft. Press stationary from intermediate
(5) with fl at screwdriver. Examine all seal
parts. Inspect contact faces for signs of
uneven wear tracks on stationary, chips
and scratches on either seal face.
DO
NOT interchange seal components,
replace the entire shaft seal (4).
Remove retaining rings (6) from shaft.
Using a wheel puller or arbor press
remove bearing (3) from shaft. Remove
upper motor bearing from shaft with a
bearing puller. (See Figure 3)
Check sleeve bearing (39) for excessive
wear, if replacement is required the
complete intermediate coupling (5)
should be replaced.
Moisture Probes -
Remove screws (37)
and wire (33) from probes (36). Remove
probes (36) from intermediate (5).
IMPORTANT! - All parts must be
clean before reassembly.
Handle seal parts with extreme
care. DO NOT damage lapped
surfaces.
Reassembly
Moisture Probes -
Apply thread
compound to thread on probes (36) and
install in intermediate (5). Connect wires
(33) with screws (37).
Bearings -
Be careful not to damage
the rotor shaft when replacing bearings.
Using an arbor press, hold the rotor and
press the upper bearing on the rotor
shaft, applying force to the inner race of
the bearing only. Replace upper retaing
ring onto rotor shaft. In the same manner
replace lower bearing (3) onto rotor shaft.
Place lower retaining rings (6) onto shaft.
Inner Seal -
Clean and oil seal cavity
in intermediate coupling (5). Lightly
oil
(Do not use grease)
outer surface
of stationary member. Press seal’s
(4) stationary member firmly into
intermediate coupling (5), using a seal
tool or pipe.
Nothing should come in contact with the
seal face except the seal tool. Be sure the
stationary is in straight. Place seal’s (4)
retaining ring and spring over shaft until
seated on shaft shoulder. Slide a bullet
tool over rotor shaft threads. Lightly oil
(Do not use grease)
shaft, bullet, and
inner surface of bellows on rotating
member, with fi nished end away from
motor, slide rotating member over bullet
and onto shaft until it engages spring.
Make sure spring is seated in retaining
ring and spring is lined up on rotating
member and not cocked or resting on
bellows tail. (See Figure 3)
Motor -
Slide rotor/shaft with bearing
(3) and seal parts (4) into intermediate
coupling (5) until bearing seats into
intermediate coupling. Install retaining
ring (2) into intermediate coupling (5).
Place motor stator over rotor, lining up
motor bolts with holes in intermediate
coupling (5). Place end bell on top of
motor and insert motor bolts and torque
to 17 in-lbs.
Wiring Connections -
Set square ring
(7) in grove on intermediate coupling
(5). Pull wires through opening in top of
motor housing (8) while lowering motor
housing onto intermediate coupling (5).
Insert capscrews (10) with lockwasher (9)
through motor housing into intermediate
and tighten. Place square ring (12) on
motor housing (8). Place conduit box with
cables next to motor housing and make
wire connections (see Figure 4). Connect
ground wire (42) with screw (31) to
conduit box (11) if disconnected.
Check power cable (13) and control cable
(14) for damage and replace complete
conduit box and cable assembly if
required.
Service
Figure 3
PFG 3, 5 & 7.5HP
Submersible Grinder Pumps
