TM5-6115-593-34
NAVFAC P-8-631-34
TO-35C2-3-463-2
(d)
Remove exciter rotor (38).
(e)
Remove screws (82) and washers (83) to free
bearing cap (84)
(f)
Attach crane or hoist to endbell (85). Remove
screws (80) and washers (81). Remove endbell
(85) and PMG stator and exciter stator as a unit.
NOTE
Tap lightly with rubber or fiber mallet to
loosen endbell. Check for shims in the
endbell bearing housing (well). Make certain
shims, when incorporated, are reinstalled
when unit is assembled .
(g)
Remove nut (86) and lockwasher (87).
(h)
Use a puller to remove the bearing form the shaft.
(See figure 11-15.) protect the shaft end with a
cap. If bearing is to be used again, make sure
puller applies pressure only against the bearing
inner ring.
(i)
Install pipes over generator shaft on the drive
and exciter end of rotor. Attach slings and hoist
to pipes and remove rotor assembly (89) from
stator and frame (93). Make certain air gap is
maintained between the rotor and stator during
removal of the rotor.
CAUTION
Make certain pipes are of sufficient
strength to support weight of rotor
and that pipes do not have rough
edges which would damage shaft
surface.
(a)
Install pipes over generator shaft on the drive and
exciter end of rotor. Attach slings and hoist to
pipes and remove rotor assembly (89) from stator
and frame (93). Make certain air gap is
maintained between the rotor and stator during
removal of the rotor.
NOTE
Install bearing as described in paragraph
11-9 and PMG and exciter as described in
paragraphs 11-6 and 11-7. Make certain
generator armature (stator) and the exciter
armature is aligned with the exciter field.
(b)
Install generator as described in paragraph 11-5.
11-13. EXCITER STATOR. The brushless exciter
provides excitation current for the generator. The stator is
the stationary field for the exciter assembly.
a.
Inspect. Inspect the exciter stator as follows:
(1)
Inspect for loose, frayed, or burned
windings.
(2)
Inspect frame for cracks and burred mating
surfaces.
b.
Test. Disconnect all leads on the stator to
completely isolate the winding.
(1)
Using a Wheatstone bridge connected to a
field winding, resistance shall be between
10.57 and 10.79 ohms at an ambient
temperature of 77°F (25°C).
(2)
Check insulation resistance with a
megohmmeter between winding and frame.
Resistance of each winding shall be at least
1 megohm at 77°F (25°C). If this value is
not met, clean or dry out winding, and
repeat test. Replace if defective.
11-31
