Cadillac 60 Series 1963 Shop Manual page 308

ELECTRICAL SYSTEM
12-27
CAUTION: Do not strike capacitor as shock
may damage diodes.
2. Press new capacitor in same way, from in-
side of end frame toward outside. Re-assemble
capacitor lead to heat sink, carefully noting
arrangement of parts, Fig. 12-38. Install retain-
ing screw.
e. Stator
1. Make sure stator leads are disconnected.
2. Check stator windings for grounds, opens, or
shorted windings using a 110-Volt Test Lamp,
Fig. 12-40.
GROUNDS—If test lamp lights when connected
from any lead to stator frame, windings are
grounded.
OPENS—If lamp fails to light when successively
connected between each pair of stator leads, wind-
ings are open.
SHORTS—A short circuit in the stator windings
is difficult to find due to the low resistance in the
winding. However, if all other electrical checks
are normal and generator still fails to supply
rated output, it is an indication that the stator
windings are probably shorted.
3. If necessary to replace stator, it must be r e -
placed as a unit.
f. Rotor
.1. Test rotor for grounds, opens, or shorts with
the aid of 110-Volt Test Lamp, Fig. 12-41.
GROUNDS—Connect test lamp from either slip
ring to rotor shaft or rotor poles. If lamp lights,
field windings are grounded.
OPENS—Connect the leads of the test lamp to
each slip ring. If lamp fails to light, windings are
open.
SHORTS—Connect a 12-volt battery and am-
meter in series with slip rings and note ammeter
reading. If above 2.3 amperes, it is an indication
that shorted windings exist.
2. Inspect slip rings. If they are dirty, they
may be cleaned and finished with 400 grain, or
finer, polishing cloth. Spin rotor in a lathe to
insure that slip rings are cleaned evenly with no
flat spots.
3. If necessary, slip rings that are out of round
or rough should be turned in a lathe to .001 inches
maximum indicator reading. Finish with a 400
grain or finer polishing cloth.
(CHECK FOR OPENS)
110-VOLT TEST LIGHT LEADS
110-VOLT TEST LIGHT LEADS
(CHECK FOR OPENS) (CHECK FOR GROUNDS).
Fig. 12-40 Checking Stator
g. Bearing
1. Check bearing in drive end frame for rough-
ness.
2. If necessary to replace bearing, end frame
must be replaced.
3. Check bearing in slip ring end frame and r e -
place if its grease supply is exhausted. No attempt
should be made to re-lubricate and re-use this
bearing.
4. If necessary, press out bearing with a tube
or collar that just fits inside end frame housing.
Press from outside of housing toward inside.
Install new bearing by supporting inside of end
(CHECK FOR GROUNDS)
— 110-VOLT TEST LIGHT LEADS
(CHECK FOR OPENS)
110-VOLT TEST LIGHT LEADS
4. If necessary replace rotor as a unit.
Fig. 12-41 Checking Rotor