STARTER TESTING AND REPAIR.
This task covers:
c. Cleaning and Inspection
One fiber washer
500 amp test stand
Two electrical parts kits
Dry cleaning solvent (Item 23, Appendix B)
Grease (Item 36, Appendix B)
Sealing compound (Item 60, Appendix B)
General Safety Instructions
Compressed air used for cleaning purposes should never exceed 30 psi (207 kPa).
Dry cleaning solvent is flammable and must not be used near open flame. Use only in a
Turn pinion on screw shaft to check for freedom of operation, Check armature for freedom of
rotation by prying on pinion with screwdriver.
If pinion does not operate freely, or if armature does not rotate freely, repair starter. If pinion
and armature are good, test starter.
Mount starter on 500 amp test stand as shown. Supply starter with 24 volts, and
record amperage and starter rpm.
Readings should be 40-80 amps and 8000-12500 rpm, If readings are not correct, repair
starter using guidelines in steps 5-9.
If there is low rpm and high amperage, check for:
(a) Tight, dirty, or worn bearings
(b) Bent or shorted armature
(c) Grounded armature or fields
If there is high amperage and starter does not operate, check for direct ground in terminal or
If there is no amperage and starter does not operate, check for:
(a) Open field circuit; check connections through field with test light.
(b) Open armature coils; inspect commutator for badly burned bars.
(c) Broken brush springs, worn brushes, high insulation between commutator bars, or other
conditions that would prevent good contact between brushes and commutator.
If there is low rpm and low amperage, check for poor connections, defective leads, or dirty