Brush Holders; Assembly - Piper SENECA II Service Manual

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PIPER SENECA II SERVICE MANUAL
Figure
11-18.
Testing Motor
Fields for Grounds
CARBON PILE
IATTERY
!TARTING MOTOR
TYPICAL TE_ST SET-UP
Figure
11-19.
No-Load Test Hookup
11-36.
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.
11-37. ASSEMBLY.
a. When assembling the starting motor always use an arbor press and the proper bearing arbor for
installing graphitized bronze bearings.
b. Soak new absorbent bronze bearings in SAE 20 oil before installation. Saturate the felt oiling pad
in the commutator end head with SAE 20 oil. Allow excess oil to drain out before installing end head on
motor. Put a light film of Lubriplate 777 on the drive end of the armature shaft before and after installing
the drive end head.
c. New brushes should be properly seated when installing by wrapping a strip of 00 sandpaper
around the commutator (with the sanding side out) 1-1/4 to 1-1/2 times maximum. Drop brushes on
sandpaper covered commutator and tum the armature slowly in the direction of rotation. Dust should be
blown out of the motor after sanding.
Reissued: 10/11/79
NOTE
The spring tension is 32 to 40 ounces with new brushes. This
tension is measured with the scale hooked under the brush spring
near the brush and the reading is taken at right angles to the line
of force exerted by the brush spring.
ELECTRICAL SYSTEM
2G19