4C-14 - CHARGING SYSTEM 90-823225--1 1096
13. Remove the three phillips head screws and lock-
washers which secure the front bearing retaining
plate.
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b
a
a - Phillips Head Screws and Lockwashers
b - Front Bearing Retaining Plate
14. Remove front bearing from front end frame using
an arbor press and a suitable size mandrel. (Dis-
card bearing.)
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Removing Front Bearing from Front End Frame
15. If rotor slip rings or rear bearing requires replace-
ment, entire rotor must be replaced. Parts cannot
be purchased separately.
Cleaning and Inspection
1. Clean all parts with a clean, soft cloth. DO NOT
use solvent, or electrical components may be
damaged.
2. Inspect the following parts for wear and damage:
a. Brush/regulator assembly - inspect for
cracked casing, damaged brush leads, poor
brush lead solder connections, weak or bro-
ken brush springs or worn brushes. Replace
brush set if brushes are less than 1/4 in. (6
mm) long.
b. Rotor - inspect for stripped threads, scuffed
pole piece fingers or damaged bearing sur-
faces (because of bearing turning on shaft).
c. Rotor-slip rings - clean slip rings with 400
grain (or finer) polishing cloth while spinning
rotor in a lathe. Blow off dust with com-
pressed air. Inspect slip rings for grooves,
pits, flat spots or out-of-round [.002 in. (0.051
mm) maximum] and replace rotor, if present.
d. Rotor shaft and front end bearings - in-
spect for damaged seals, lack of lubrication,
discoloration (from overheating) and exces-
sive side or end play. Bearing should turn
freely without binding or evidence of rough
spots.
e. Stator - inspect for damaged insulation or
wires; also inspect insulating enamel for heat
discoloration, as this is usually a sign of a
shorted or grounded winding or a shorted
diode.
f. Front and rear end frames - inspect for
cracks, distortion, stripped threads or wear in
bearing bore (from bearing outer race spin-
ning in bore). End frame(s) MUST BE re-
placed, if bearing has spun. Also, inspect
bearing retainer recess in front end frame for
damage.
g. Fan - inspect for cracked or bent fins, broken
welds (bi-rotational fan only) or worn mount-
ing hole (from fan spinning on shaft).
h. Pulley - inspect pulley mounting bore end for
wear. Inspect drive surface of pulley sheaves
for trueness, excessive wear, grooves, pits,
nicks and corrosion. Repair damaged sur-
faces, if possible, with a fine file and a wire
brush or replace pulley, if beyond repair.
Drive surfaces MUST BE perfectly true and
smooth or drive belt wear will be greatly ac-
celerated.
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