Section 6: ELECTRICAL
PA1553
45
8. Separate the rotor assembly and drive end
frame from the stator assembly by removing
the attaching screws.
9. Remove the shaft nut and washer, and the
pulley. Press the rotor shaft out of the drive
end frame.
10. Remove the retainer plate and pull the
bearings from the drive end frame.
7.8.2 Alternator Cleaning and Inspection
Whenever the alternator is disassembled, it
should be cleaned and inspected.
Cleaning
If sludge has accumulated on the stator, a light
mineral oil should be used to clean it.
Inspection
When the alternator has been disassembled to
the extent that the stator is exposed, the stator
should be checked for the following:
a) Adequate varnish.
b) Proper spacing of conductors so that “near
shorts” do not exist.
c) Proper phase lead placement.
d) Strong conductor and cross-over welds
7.8.3 Bearing or Rotor Replacement
Whenever the rotor and drive end frame are
disassembled for any reason, the single-row ball
bearing must be replaced with a new one due to
the probability of damage during disassembly.
Removal and Disassembly
1. If the pulley was not removed from the rotor
shaft at time of alternator removal, remove
the nut and flat washer from the shaft and
pull the pulley off the shaft.
2. Remove the six bolts and lock washers
attaching the drive end frame to the stator
frame. Separate the drive end frame from
the stator frame. Remove the drive end
frame and support assembly.
3. Support the drive end frame in an arbor
press so that the rotor can be pressed down
out of the end frame. Using a suitable
adapter against the end of the rotor shaft
that will pass through the inner race of the
double-row ball bearing, press the rotor
down out of the end frame and bearings.
Since the single-row bearing outer race is
held in the end frame by the retainer plate,
and the inner race is a press fit on to the
rotor shaft, the bearing will probably be
damaged when the shaft is pressed out and
need to be replaced with a new part.
4. Remove the six screws attaching the
bearing retainer plate to the drive end frame.
Remove the retainer plate, the single-row
bearing and the bearing spacer from the end
frame.
5. Support the drive end frame in an arbor
press with the double-row bearing down, so
that the bearing can be pressed down out of
the end frame. Using a suitable driver that
will exert a force on the bearing outer race,
press the bearing out of the end frame.
6. Remove the rubber bearing clamp from
groove in the end frame.
Assembly and Installation
1. Install a new single-row ball bearing into
inner side of the drive end frame. Install the
bearing retainer plate and attach with six
screws. Stake screws in place after
tightening.
2. Position the rubber bearing clamp in the
groove in bearing bore of the drive end
frame. Lubricate the clamp to permit the
bearing to be pressed in without dislodging
or damaging the clamp.
3. Position the rotor in an arbor press with the
shaft end up. Install the drive end frame and
single-row bearing assembly over the rotor
shaft. Using a driver over the rotor shaft,
which will exert a force on the bearing inner
race, press the bearing onto the shaft until it
bottoms against the rotor.
4. Install bearing spacer over the rotor shaft.
Position the double-row bearing over the
rotor shaft at end frame bore. Using an
adapter that will exert a force on both the
inner and outer races of the bearing, press
the bearing onto the shaft and into the end
frame until the inner race bottoms against
the bearing spacer.
5. Place a new seal around the drive end of
the stator frame.
6. Insert the rotor between the stator and field,
and position the drive end frame against the
stator frame. Attach the end frame to the
stator frame with six bolts and lock washers.
Tighten the bolts to a torque of 5 to 5.4 lbf-ft
(6-7 Nm).
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