Arctic Cat Pantera 3000 Service Manual page 185

3. Inspect the brush holder assembly and brushes for
damage or wear. Using a caliper, measure the length of
the brushes. If brush measurement is less than 0.40 in.,
replace with new brushes and brush springs as a set.
4. Inspect brush leads for cracks, wear, or fraying. If
any of these conditions exist, replace with new
brushes along with new brush springs as a set.
5. Inspect the rear cover bushing for wear.
6. Inspect the front cover bearing for wear.
7. Inspect the brass commutator end of the armature for
any discolored spots or damage. If the commutator is
slightly discolored or damaged, the armature must be
replaced. This is a molded commutator and no attempt
to turn it down in a lathe should be attempted.
CAUTION
Do not use emery cloth to clean the commutator as
emery particles will become imbedded in the brass
commutator resulting in a short circuit. Use only #200
grit sandpaper.
8. Inspect the commutator end of the armature for
buildup in the grooves. Carefully remove any
buildup by undercutting using a thinly ground hack-
saw blade. Do not cut any deeper than the original
groove which can be seen by looking at the end of
the commutator.
9. Using a caliper, measure the undercut. Maximum
undercut groove must be as shown.
5000/9000
SNO2171
7000
SNO-382A
CAUTION
Buildup in the grooves must be removed to prevent any
chance of an electrical arc between individual sections
of the commutator.
184
10. Inspect the commutator for shorting using a multi-
meter and the following procedure.
A. Set the selector to the OHMS position.
B. Touch the black lead to the armature shaft.
C. Using the red tester lead, probe the commutator end
of the armature. The meter indicator should not
change. If the indicator shows resistance, the arma-
ture is shorted and must be replaced.
11. Inspect the armature for shorting using a "growler"
and the following procedure.
A. Place the armature in the "growler."
B. While holding a metal strip on the armature, rotate
the armature an entire revolution. If the metal strip
vibrates at any point on the armature, the armature is
shorted and must be replaced.
0725-653
12. Inspect the ground brushes to make sure they are
properly grounded. Use a multimeter and the follow-
ing procedure.
A. Set the selector to the OHMS position.
B. Touch the black tester lead to a ground brush.
C. Touch the red tester lead to the brush holder assembly.
NOTE: If no resistance is indicated, check the

ground connection for tightness and for cleanliness. If
there is still no meter indication, replace the brush
assembly.
ASSEMBLING
1. With the brush assembly secured in a vise, compress
each brush all the way into the housing; then care-
fully push the brush wire over and down to secure
the brush in the fully compressed position.