Remove screws (31) and washers (32)
holding the PMG stator frame, and
screws (54) and washers (55) supporting
the exciter field (56) to the endbell (85).
Replacement. Replace as follows:
Install exciter field (56) onto endbell
(85) with screws (54) and washers
(55). Connect exciter field leads to
reconnection box. Remove tags from
Figure 11-11. Removing Exciter
Armature and Rotating
Install exciter rotor (38) on generator shaft
If the "slip-fit" exciter armature and
rotating assembly will not easily slide
onto the shaft by hand, install with a
fixture as shown in figure 11-12.
Usually the exciter armature will slide
onto the shaft most of the way by
hand. The exciter armature can
usually be "seated" by tapping lightly
on the sleeve with a soft rubber or
fiber mallet. Make certain mallet hits
only the sleeve, not rectifier assembly
or armature windings
Make certain the key is in place in the
generator shaft and the keyway in the
exciter armature sleeve is aligned with
key before starting the exciter
armature onto generator shaft.
Refer to figure 11-12 for fixture setup. Start
exciter armature and rectifier bridge on
shaft. Thread stud in rotor shaft. Install
large diameter washers on stud and start
stud nut. Pull exciter armature and rotating
rectifier onto shaft by turning stud nut.
Install exciter armature retaining bolt (34,
figure 11-3), washer (35), and pin (36).
Connect alternator field leads to positive (+)
and negative (-) terminals located on the
heat sinks of the rotating rectifier assembly.
Install exciter cover (30) with screws (26
and 28) washers (29), and nuts (27).
Using a crane or hoist, install the PMG stator (33)
over exciter assembly onto endbell (85) with screws
(31) and washers (32). Connect PMG stator leads to
reconnection assembly. Remove tags from leads.
(d) Remove iron band (if used) from PMG rotor
assembly (37). Carefully attach PMG rotor (37), bolt
(34), and washer (35).