DF9.9T/TH “K8” (’08) MODEL 12-19
DISASSEMBLY
For correct assembly, scribe an alignment mark on the field
case and brush holder.
Remove the two (2) screws 1 securing the field case 2 to the
brush holder 3.
Slide the field case upward and away from the brush holder.
Note the position of the O-ring 4 encircling the brush holder.
Remove the armature 5 from the brush holder.
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 adjacent commutator segments.
Replace armature if no continuity is indicated.
Inspect the commutator surface.
If surface is gummy or dirty, clean with 400 grit emery paper.
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.
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