Field Coils Check; Brush Holders Check; Bendix Drive; Starting Motor Assembly - Piper PA-24 Comanche Service Manual

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PIPER COMANCHE SERVICE MANUAL
FIGURE 9·29b. TURNING STARTING
MOTOR COMMUTATOR
PIGURE 9·29c. TESTING MOTOR
ARMATURE FOR SHORTS
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9-83. Fi.ld Coils.
a.
~eck
the field coils for groWlds (Refer to
Fipr~
9-29d)
by
placing cae test probe
01'1
the fraIDe and the other on the starter tenDieal. Be sure the brushes are nex accidentally touching
the frame. If the lamp U&hts, the fields are &rOUilded. Repair or replace.
b. Inspect all ccanections to make sure they are dean and ti&ht and iespect insulation for
deted oration.
9-84. Brush Hold.".
a. To test brush holders, touch one test probe to the brush plate and the other to each brush
holder.
b. The test
lamp
should Uiht
_Ium
the Itouftded brush holders
are
touched and should not
light when the insulated brush holders ate touched.
9-85. <Mar And PiniOft H_lin,. Icspect housU1gS for cracks and bearings for excessive wear.
Remove
rust,
paint or grease from mountinl surfaces.
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9-86. B.ndix
Drive.
The Bendix Drive should
FIGURE 9·29d. TESTING MOTOR
FIELDS FOR GROUNDS
be
wiped clean with a dry cloth. The pmllJl'l
should tum smoothly in one directioo and
should lock in the other direction. Replace
drive if it fails to check
as above
or if the
PWOIl teeth
are
excessively wom or damaled.
9-87. A.....Dly.
a. When a.sembling the startina motor.
always uae all arbor press and the proper
beariac
arbor for insta1linl If8phitized bronze
and
roller bearil1ls. The Bendix shaft should
have a thin film of Lubriplate :77i or equiva-
lent on the Bendix portion of the shaft. End
ELECTRICAL SYSTFlIt
ISSUED: 8/18/72
3
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