6-4. STARTER - REPAIR (Contd)
1. BRUSH COMPONENTS.
a. Check brush (19) lengths against
length of new brush. Brushes that
are less than two-thirds the length
of a new brush must be replaced.
b. An oil soaked brush must also be
c. Check to ensure that brushes fit
well in holders (13 and 14), but
d. Inspect brush springs (15) for
distortion or discoloration.
Do not turn down commutator nor undercut
insulation between commutator bars.
Replace armature if commutator cannot be
restored satisfactorily in STEP 2, below.
2. CHECK CONDITION OF COMMUTATOR, AND
CLEAN, IF NECESSARY, USING NO. 240
GRIT EMERY PAPER.
3. CHECK FOR SHORT CIRCUITS IN ARMATURE
USING A GROWLER AND STEEL STRIP.
a. Rotate armature in growler.
b. Hold steel strip (e.g., hacksaw
blade) across armature slots as
armature rotates. Steel strip will
vibrate as slot between shorted
bars passes under steel strip.
c. If short circuit is detected, check
for build up of copper dust or
other conductive material between