TM 5-4240-5501-148PSTARTERSGear Drive 12V & 120VDISASSEMBLY OF STARTER MOTORSRemove the lockwasher, nuts and thru bolts. See Fig.116. The armature, drive cap and gear drive can now beremoved as an assembly.NOTE: THRU BOLTS AND NUTS MUST BE PLACEDIN THE SAME POSITION AS WHEN REMOVED ORINTERFERENCE MAY RESULT.(See checking starter motor drive if repair, cleaning orreplacement of drive assembly is necessary.)Fig. 116 Removing Thru BoltsCAUTION: Do not clamp the motor in a vise or strike themotor with a hammer. Some motors include twopowerful ceramic magnets which can be broken orcracked if the motor housing is deformed or dented.To remove the commutator end cap, lift the brushsprings and slide brushes out of the brush holders. The120 volt AC starter motor rectifier assembly may now beremoved by loosening the cover screw and unsolderingthe field lead attached to the rectifier assembly. See Fig.117.Fig. 117 Removing RectifierClean all dirt or corrosion accumulations from thearmature, commutator end cap, drive end cap, etc. Thebearings, housing and armature should not be soaked ina cleaning solution. The armature commutator may becleaned with a fine sand paper. Do not use emery cloth,as emery will embed in the commutator and cause rapidbrush wear. If it is suspected that the armature, field coilor motor housing is defective, new parts should be triedin the motor. If proper testing equipment is available,check the suspected armature or field coil to determine ifit is defective. The brushes should be checked forproper seating, weak brush spring, dirt, oil or corrosion.Brush spring pressure should measure from 4 to 6ounces when pressed to working position. Also check tobe sure brushes are not sticking in their respective brushholders. See Fig. 118.Fig. 118 Checking brushesCHECKING THE RECTIFIER ASSEMBLY 120 VOLTAC STARTER MOTORThe rectifier assembly consists of a spring loaded switch,which is in a normally "off" position, an AC three wireground receptacle and four rectifiers encapsuled in anepoxy case. The test procedure for checking the rectifieris as follows:Equipment Needed1.An AC volt meter capable of measuring 120 voltsAC.2.A DC volt meter capable of reading 100 voltsDC.3.A 10,000 ohm resistor (1 watt).34
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