8-12 POWER TRIM AND TILT
PTT MOTOR INSPECTION
Armature and Commutator
1. Inspect continuity between commutator and armature
core / shaft.
If continuity exists, replace armature.
\ 09930-99320 : Digital tester
T Tester range :
@@
@@
@ (Continuity)
2. Inspect continuity between adjacent commutator segments.
If no continuity exists, replace armature.
3. Inspect commutator surface for gum or dirt.
Clean with #500 grit emery paper if necessary.
Measure commutator outside diameter.
\ 09900-20101 : Vernier calipers
Commutator outside diameter :
Standard : 22.0 mm (0.87 in.)
Service limit : 21.0 mm (0.83 in.)
If measurement exceeds service limit, replace armature.
4. Measure commutator undercut (depth) between mica
(insulator) and segments.
Commutator undercut
11
11
1 (depth) :
Standard : 1.6 – 1.9 mm (0.06 – 0.07 in.)
Service limit : 1.3 mm (0.05 in.)
If measurement exceeds service limit, cut mica to specified
depth.
NOTE:
Remove all particles of mica and metal using compressed air.
#
Wear safety grasses when using compressed air.
SEGMENT
MICA
1
1 Commutator undercut
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