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Page Title:
FIGURE 439. REMOVING OR INSTALLING ARMATURE BALL BEARINGS. |
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 worn excessively, replace armature.
e. Armature and Ball Bearings.
Turning down armature and under-
cutting mica is not recommended when
(1) Test armature for grounds. Test the
commutator is damaged. Clean the in-
armature (UU) for grounds as shown in
sulation between commutator bars by
carefully running a sharp knife blade
and contact one lead to end of armature
between the bars. Cleaning grooves
shaft. Touch each commutator bar in
will remove any possible brush carbon
turn with the other lead. When test lamp
or metal filings which would possibly
lights, as one individual bar is connected,
short out bars. Remove two ball bear-
a short circuit exists in the armature in-
ings (CC) and spacer (TT), to replace
sulation between armature shaft and
a damaged or defective armature.
commutator bar. Replace armature
when bars are short- circuited.
(b) Remove ball bearings as follows. Fig-
ure 439. (A) Remove front ball bearing
using a suitable bearing puller. (B)
Remove rear ball bearing using a suit-
able bearing puller. (C) Remove rear
ball bearing spacer.
Note. Install new ball bearings by
pushing them onto armature shaft, by
hand, until tight against shoulder on
shaft. If necessary, use a small hollow
tube, with inside diameter a little
larger than armature shaft diameter,
to butt against ball. bearing inner race
to tap bearings into position.
GROUNDS USING TEST LAMP.
(3) Ball bearings. Inspect the ball bearing
(CC) on each end of armature shaft for
(2) Check armature commutator bar and
roughness or uneven rolling action.
clean mica insulation.
When ball bearings are unserviceable,
replace both ball bearings (fig. 439).
(a) Check brush contact area on commu-
tator bars for excessive wear. When
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