Figure 80-5. No-Load Test Hook-up Figure 80-6. Stall-Torque Hook-up
ASSEMBLY OF STARTING MOTOR
1. When assembling starting motor, always use an arbor press and proper bearing arbor for installing
graphitized bronze and roller bearings. The Bendix shaft should have a thin film of Lubriplate #777 or
equivalent on Bendix portion of shaft.
2. 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 turn armature slowly in direction of rotation. Dust should be blown out of the
motor after sanding.
—NOTE—
The spring tension is 32 to 40 ounces with new brush. This
tension is measured with scale hooked under brush spring near
brush and reading is taken at right angles to line of forc e
exerted by brush spring.
3. Check position of pinion to be sure unit will mesh properly with flywheel ring gear. See specifications
for unit for correct dimensions. (Refer to Starting Motor Starting Test Specifications.)
80 - 12 - 00
Page 80 - 08
Reissued: August 1, 1986
2L4
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
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