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PIPER CHEROKEE WARRIOR SERV I C E M A N U A L
11-80. BRUSH HOLDERS.
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 light when the grounded brush holders are touched and should not light when
the insulated brush holders are touched.
11-81. GEAR AND PINION HOUSING.
Inspect the housing for cracks and bearings for excessive wear. Remove rust, paint or grease from
mounting surfaces.
11-82. BENDIX DRIVE.
The Bendix Drive should be wiped clean with a dry cloth. The pinion should turn smoothly in one
direction and should lock in the other direction. Replace drive if it fails to check as above or if the pinion teeth
are excessively worn or damaged.
11-83. ASSEMBLY OF STARTING MOTOR
a. When assembling starting motor, use an arbor press and proper bearing arbor for installing graphi-
tized bronze and roller bearings.
b. New brushes must be properly seated when installing by wrapping a strip of 00 sandpaper around
commutator (sanding side out) l-l/4 to l-l/2 times maximum. Drop brushes on sandpaper covered commutator
and turn armature slowly in direction of rotation. Dust must be blown out of motor after sanding.
Spring tension is 32 to 40 ounces with new brushes. Tension is
measured with scale hooked under brush spring at brush. Pull
on a line opposite the line of force exerted by spring and take
reading just as spring leaves brush.
c
Check position of pinion to be sure unit will mesh properly with flywheel ring gear.
11-84. BENCH TEST
a. After starting motor is assembled test to see that the no-load current at a certain voltage is per
specifications in starting motor service test specifications. To test, connect as shown in figure 11-53. lf current
is too high, check bearing alignment and end play to make sure there is no binding or interference. Two or
three sharp raps on frame with a rawhide hammer will often help to align bearings and free armature.
b. If no difficulty is indicated in the above test, conduct a torque test to see if starting motor is pro-
ducing its rated cranking power. Make test connections as shown in figure 11-54.
c. If torque and current are not within specifications, check seating of brushes and internal connec-
tions for high resistance. If found to be in good order, replace frame and field assembly and test starter.
11-85. STARTING MOTOR CONTROL CIRCUIT.
a. Inspect control circuit between battery, solenoid, and manual starting switches for breaks, poor
connections and faulty insulation. Tighten all connections and make sure solenoid is firmly mounted and
makes good ground connection.
b. Check voltage loss across switch contacts during normal starting. lf loss is in excess of 0.2 volts
per 100 amperes, solenoid must be replaced.
c. If solenoid fails to operate when manual starting switch is turned on or if it fails to release when
manual starting switch is released, it must be removed and tested to specifications. lf either opening or closing
voltages are not to specifications, replace solenoid.
Revised: February 28, 1995
NOTE
2G2
Island Enterprises
ELECTRICAL SYSTEM
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