Field Coils; Brush Holders - Piper Navajo PA-31 Service Manual

PIPER NAVAJO SERVICE MANUAL
376
377
STARTING MOTOR
Figure 1 1-42. Testing Motor
Fields for Grounds
Figure 11-43. No Load Test
Hook -Up
11-67. FIELD COILS.
a. Check the field coils for grounds (Refer
to Figure 11-42 .) by placing
one
test probe on the frame and the other on the starter
terminal.
Be sure the brushes
are not accidentally
touching the frame.
If the lamp lights, the fields are ground-
ed. Repair or replace.
b. Inspect
all connections to make sure they are clean and tight and inspect
insulation
for deterioration.
11-68.
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.
11-69. GEAR AND PINION HOUSING. Inspect housings for cracks and bearings
for excessive
wear. Remove rust,
paint or grease
from mounting surfaces.
Reissued: 10/12/79
ELECTRICAL SYSTEM
4C21