Buell XB 2010 Service Manual page 496

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7. Locate the two brushes attached to the field coil winding.
Pushing on inboard side of one brush, grasp free end of
brush spring on outboard side with the hooked end of a
suitable pick. Raise end of brush spring only as far as
necessary to free brush from brush holder. Repeat step
to release second brush and then remove brush holder
from field coil.
Inspection
1. For testing procedures, see the ELECTRICAL DIA-
GNOSTIC MANUAL.
2. Inspect two O-rings in field coil bore for cuts, tears or signs
of deterioration.
3. Place armature in lathe or truing stand and check runout
of commutator. Commutators with more than 0.015 in.
(0.38 mm) of runout should be replaced or machined on
a lathe. Commutators should be replaced when diameter
is less than 1.141 in. (29.98 mm).
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1. Segments
2. Mica
3. Incorrect (Mica must not be left with a thin edge next to segments)
4. Correct (Mica must be cut away clean between segments)
5. Starting groove in mica with 3 cornered file
6. Undercutting mica with piece of hacksaw blade
7. Commutator
6-22 2010 XB Service: Electrical
4.
5.
6.
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Figure 6-22. Undercutting Mica Separators
Check depth of mica on commutator. If undercut is less
than 0.008 in. (0.20 mm), use an undercutting machine to
undercut the mica to 1/32 in. (0.79 mm) deep. The slots
should then be cleaned to remove any dirt or copper dust.
NOTES
See Figure 6-22. If an undercutting machine is not avail-
able, undercutting can be done satisfactorily using a thin
hacksaw blade. After undercutting, lightly sand the arma-
ture with crocus cloth to remove any burrs.
Do not use sandpaper or emery cloth on commutator. The
abrasive grit may remain on commutator segments and
could cause excessive brush wear.
Inspect armature roller bearings. Bearings must rotate
freely without drag or sticking. Replace the bearings if
pitted or grooved.
Replace brush springs if bent or distorted.
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