10.41
ELECTRICAL
10
9923412 - 2012 Sportsman 400/500 and EFI Tractor Service Manual
© Copyright 2011 Polaris Sales Inc.
3. Remove brush plate and brushes. Measure length of
brushes and replace if worn past the service limit.
Replace springs if they are discolored or have
inadequate tension.
NOTE: The electrical input post must stay with the
f
ield coil housing.
4. Inspect surface of commutator for wear or
d
iscoloration. See Steps 3-6 of ‘Armature Testing’.
Brush Inspection
1. Measure length of each car
bon brush. Replace
brush assembly when worn to 5/16” (8 mm) or less.
The brushes must slide freely in their holders.
Brush Replacement
1. Install a new carbon brush assembly in the brush
h
ousing. NOTE: Be sure that the terminal bolt
insulating washer is properly seated in the housing,
and the tab on the brush plate engages the notch in
the brush plate housing.
2. Place a wrap of electrical ta
pe on the threads of the
terminal bolt to prevent O-Ring damage during
reinstallation.
3. Install the O-Ring over the
bolt. Make sure the O-ring
is fully seated.
4. Remove the electrical tape and reinstall the two small
phenolic washers, the large
phenolic washer, flat
washer, and nut.
Armature Testing
1. Remove armature from starter casing.
NOTE: No
te order of shims on drive end for reassembly.
2. Inspect surface of commu
tator. Replace if
excessively worn or damaged.
3. Using a digital multitester, mea
sure the resistance
between each of the commutator segments. The
reading should be .3 ohms or less.
4. Measure the resistance b
etween each commutator
segment and the armature shaft. The reading should
be infinite (no continuity).
5. Check commutator bars for discoloration. Bars
d
iscolored in pairs indicate shorted coils, requiring
replacement of the starter motor.
6. Place armature in a growler. Turn growler on and
p
osition a hacksaw blade or feeler gauge lengthwise
1/8” (.3 cm) above armature coil laminates. Rotate
armature 360
°. If hacksaw blade is drawn to armature
on any pole, the armature is shorted and must be
replaced.
Limit 5/16” (8 mm)
Brush Length
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