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Loosen or remove the bolts (as needed) from the coupling to separate
the coupling halves.
Remove the PMG:
1. Remove the exciter cover.
2. Disconnect the alternator field leads, and remove the exciter
armature and PMG retaining bolts.
3. Install a wire or metal strap around the OD of the PMG to
ground the magnets. Grasp the inside magnets and pull quickly
and sharply straight back, overcoming the magnetic pull of the
PMG rotor toward the PMG armature.
4. Wrap the PMG rotor in plastic to avoid contamination with metal
filings.
Remove the Exciter Armature and Rectifier as a Unit:
1. Remove the clips securing the exciter field leads to the exciter
frame, the generator frame and generator endbell.
2. Disconnect the generator field (rotor) leads from the positive (+)
and negative (-) exciter armature lead terminals located on the
rotating rectifier assembly.
3. Using a hoist and strap, slide out and remove the exciter
armature and rectifier tube assembly, which is keyed onto the
shaft.
Remove the Exciter-PMG Frame-Stator:
1. Connect a hoist to the lifting eyes.
2. Remove the exciter-PMG frame-stator mounting bolts, and
remove the exciter-PMG frame-stator.
Remove the opposite-drive end bracket.
Dismantle the bearings:
1. Twist the knob on the spring-loaded holders, and pull the RTDs
out of the bearing hanger.
2. Dismantle all air tubes and oil supply lines.
3. Dismantle the outboard seal carrier and inboard seal carrier.
4. Loosen the bolts that connect the carriers to the housing, and
remove them.
5. Loosen and remove the split line bolts.
6. Remove simultaneously, in the axial direction, both the top and
bottom halves of the seal carriers.
7. Remove the garter springs and the gap seal and labyrinth seal.
8. Remove the gasket.
Dismantle the Top Half of the Bearing Housings:
1. Remove the split-line bolts.
2. On the opposite-drive-end side, lift the top part of the bearing
housing until it can be moved in an axial line over the bearing
liner without touching it, and then move it out.
3. On the DE side lift the housing out and over the top of the
generator.
WARNING:
Use a hoist and
slings or chains to support components
during removal. Use lifting devices that
are selected for generator component
weights. Improper lifting techniques
may cause serious injury or death.
Be extremely careful not to damage
components.
CAUTION:
Ensure the generator
field wires are flat in the wireway so they
don’t tear during pulling. Do not pull
on the edges of the heat sinks or on the
exciter armature windings.
CAUTION:
Do not pull on the edges
of the rectifier or on the exciter armature
windings.
WARNING:
Pull the exciter-PMG
frame-stator straight out. The assembly
may pull toward the PMG.
NOTE:
If your generator has split roller
bearings, please consult the bearing
manual that came with your manual
package.
CAUTION:
Ensure the work place
is clean. Contamination and damage to
the bearing, especially of the running
surfaces, reduce operating quality and
could lead to premature damage or
failure.
NOTE:
The outside seal carrier on the drive
end bearing does not have split line bolts.
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