Club Car Gasoline Service Manual page 170

Cleaning, Inspection, and Replacement of the Commutator
12
1. Clean the carbon dust, dirt and oil from the commutator. Visually inspect the commutator for worn,
burned or glazed areas. Check for loose or raised commutator bars. Slight roughness of the commuta-
G
tor can be polished away with 400 or finer sandpaper (See Caution below).
CAUTION
• NEVER USE EMERY CLOTH ON THE COMMUTATOR. PARTICLES OF EMERY ARE CONDUC-
TIVE AND MAY SHORT-CIRCUIT THE COMMUTATOR BARS. NEVER USE OIL OR LUBRICANTS
ON THE COMMUTATOR OR BRUSHES.
2. Using a micrometer, measure the outside diameter at two points along the commutator. If the commu-
tator outside diameter is less than 1.535 inches (39 millimeters), replace the armature and bearings
(Figure 12-48, Page 12-33).
Armature Ground Test
CAUTION
• DO NOT SUBMERGE ARMATURE IN SOLVENT.
NOTE
• BEFORE TESTING, WIPE THE ARMATURE WITH A CLEAN CLOTH AND REMOVE CARBON
DUST AND METAL PARTICLES FROM BETWEEN COMMUTATOR BARS.
Using a multimeter set on ohms (Ω), place the positive probe on the commutator bars and the negative
probe on the armature core. The reading should be no continuity. If the reading is incorrect, replace the
armature and the two bearings (Figure 12-49).
Visual Inspection of Field Coils
If the insulation on the field coils appears blackened or charred, the serviceability of the coils is ques-
tionable. Burned or scorched coil insulation indicates the motor has overheated due to overloads or
grounded or shorted coil windings. Be sure the insulators are tight in the housing.
Page 12-34
M
DATA HOLD
AC/DC 500V MAX
250V MAX
AC V
DC V
OFF
METER READS 10.00
("1" FLASHES)
FIGURE 12-49
ARMATURE
COMMUTATOR
ARMATURE SHAFT