ARMY TM 9-6115-454-34
AIR FORCE TO 35C2-3-445-2
NAVY NAVFAC P-8-624-34
(6) Inspect housing and frames for cracks, corrosion, and distortion. Replace defective parts.
(7) Inspect bushings for wear, galling, and scores. Replace defective parts.
(8) Test armature for grounding as follows:
(a) Connect one lead of a test light to the armature core.
(b) Touch the other test lead to each commutator riser.
(c) If test light glows, armature is grounded and must be replaced.
(9) Test armature for short circuits as follows:
(a) Place armature on a growler fixture.
(b) Activate the fixture and slowly rotate armature while touching armature Iightly with a steel strip.
(c) Strip will vibrat agains armature over a shorted area.
(d) Replace armature if a short is indicated.
(10) Turn down armature if scored or out of round. Under cut mica to a depth of 0.025 to 0.032 inch below
surface of commutator. Use care to avoid widening commutator slots.
Check diameter of commutator after removing material. Diameter shall not be less than
(11) Use an ohmmeter to check field coils for insulation breakdown as follows:
(a) Attach one lead to field housing and the other lead to field coil terminal.
(b) Replace field coil if a reading of less than 1 megohm is indicated.
Inspect drive assembly for badly worn or broken teeth. Check internal spline for wear and damage.
Replace drive assembly if defective.
Inspect brushholders and support for cracks, corrosion. and other damage. Replace defective parts.
Measure brush length. Replace brushes if length is 5/16 inch or less.
Test brush spring tension with a spring tester. Tension shall be 36 ounces to 40 ounces. Replace
brush springs if tension is less than specified.
Inspect all threaded parts for crossed, stripped or penned threads. Replace damaged parts.
Using an ohmmeter, test for continuity across terminals of solenoid frame assembly. There shall be
no sign of open circuit.
Check solenoid frame assembly for grounding by touching one lead of ohmmeter to either lead and
the other to the frame casing. There shall be no sign of continuity.
Smooth scratches, burrs, and nicks on any machined surfaces using a fine file. Remove all fillings
Repair minor thread damage using thread chasers, taps and dies. Clean threads to remove metal
Remove minor rough spots, scores, and scratches from bushings using fine crocus cloth or a fine
stone dipped in cleaning solvent. Wash the bushings thoroughly in cleaning solvent to remove all grit
and metal particles.