Plymouth Pl4S Service Manual page 137

J
GrENERATOR
135
2 •. DISASSEMBLY OF GENERATOR:
193642--Cont' d
( 4) Blow out dust and dirt from field
coils and armature windings and wipe these
parts with a clean cloth damp with cleaning
solvent.
CAUTION
Do not dip or soak the field coils
and armature in cleaning solvent.
( 5) Clean all other parts thoroughly.
( 6) Inspect parts. If the end head or
end plate are broken or brush holders are
bent or damaged, install new parts. If the
bearing fits loosely in the drive end head,
replace the head. If the bushing in the com-
mutator end plate is worn, replace the bush-
ing. Replace the bearing retainers and felts
if bent or damaged.
( 7) If the armature core and shaft
bearing surfaces are scored, damaged or ex-
cessively worn, replace the armature.
( 8) Place the armature in a growler as
shown in figure 4 and connect one test light
lead to the armature shaft and the other to
the commutator segments. If the test light
burns, indicating a grounded condition, re-
place the armature.
(9) Turn on the growler and hold a
strip of metal on the armature core, parallel
with the commutator bars (fig. 5). Turn the
armature slowly in ·,the growler. If the
metal strip becomes magnetized and vi-
brates, indicating a short circuit, replace the
armature.·
( 10) Polish the commutator with "00"
sand paper or turn the commutator down
and undercut the mica strips if badly burned
or more than .002 inch out-of-round.
( 11 ) Examine the brush holders for
misalignment or damage and test. the insu-
lated brush for ground (fig. 6). Replace the
commutator end plate assembly if damaged
or grounded.
( 12 ) Connect one test light lead to the
field terminal on the generator and the other
lead to the field coil wire (fig. 7). If the light
:l4x87
Figure
4--Testing
Armature
for Ground
(1936-42 Models)
Figure 5--Tesling Generator Armature lor Short
Circuit ( 1936·42 Models)
34x89
Figure 6--Testing Generator Insulated Brush
Holder (1936·42 Models)