8-11 POWER TRIM AND TILT
Inspection
Armature and Commutator
Check for continuity between the commutator and the armature
core / shaft.
Replace armature if continuity is indicated.
09930-99320 : Digital tester
Tester range : (Continuity)
Check continuity between the adjacent commutator segments.
Replace armature if no continuity is indicated.
Inspect the commutator surface.
If surface is gummy or dirty, clean with 400 grade emery paper.
Measure commutator outside diameter.
09900-20101 : Vernier calipers
Commutator outside diameter :
Standard 22 mm (0.87 in.)
Service limit 21 mm (0.83 in.)
If measurement exceeds service limit, replace armature.
Ensure that the mica (insulator) between the segments is un-
dercut to specified depth.
Commutator undercut :
Standard 0.5 – 0.8 mm (0.02 – 0.03 in.)
Service limit 0.2 mm (0.008 in.)
If undercut is less than service limit, cut to specified depth.
NOTE:
Remove all particles of mica and metal using compressed air.
A
Wear safety grasses when using compressed air.
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SEGMENT
MICA
1
1 Commutator undercut
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