Piper COMANCHE PA-24-180 Service Manual page 587

PIPER COMANCHE SERVICE MANUAL
FIGURE 9-29b. TURNING STARTING
MOTOR COMMUTATOR
FIGURE 9-29c. TESTING MOTOR
ARMATURE FOR SHORTS
9-83. Field Coils.
a. Check the field coils for grounds (Refer to Figure 9-29d) by placing one test probe
the frame and the other on the stater terminal. Be sure the brushes
re no accidentally touching
the frame. If the lamp Lights, the fields are grounded. Repair or replace.
b. Inspect all connections to make sure they are clean and tight and inspect insulation for
deterioration.
9-84. 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 gounded brush holders are touched and should not
light when the insulated brush holders are touched.
9-85. Gear And Pinion HNsing.
Inspect housings for cracks and bearings for excessive wear.
Remove rust. paint or grease from mounting surfaces.
1 ,
9-86. 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.
9-87. Assembly.
a. When assembling the starting motor,
always use an arbor press and the proper
bearing arborfor installing graphitized bronze
and roller bearings. The Bendix shaft should
have a thin film of Lubriplate ;777 or equiva-
lent on the Bendix portion of the shaft. End
ELECTRICAL SYSTFM
ISSUED: /18/72
FIGURE 9-29d. TESTING MOTOR
FIELDS FOR GROUNDS
3 C17