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Workman MD/MDXPage 6 -- 24Electrical System
Rework Starter/Generator (Fig. 24)
NOTE: Rework to the starter/generator must be per-
formed by a properly trained technicianusing the correct
tools and equipment for testing and reworking electrical
motors and generators. It may be more economically
feasible to replace the starter/generator than have it re-
worked.
Detail
Specification
Minimum commutator diameter 1.575 inches (40 mm)
Commutator c oncentricity to the shaft 0.0003 inch (0.008 mm)
Commutator machining limit per cut 0.005 inch (0.127 mm)
Insulator depth between commutator bars 0.020 inch (0.5 mm)
Armature insulation resistance 0.2 Mohm at 500 VDC
Dielectric (insulation strength) 500 VDC for one minute with no insulation break down
Starter field coil resistance 2.38 to 2.44 ohms at 20
o
C(68
o
F)
Generator field coil resistance 0.041 ohm for F1 and 0.043 ohm for F2 at 20
o
C(68
o
F)