TM 5-4240-501-14&PCAUTION: DO NOT clamp motor housing in a vise orstrike with a steel hammer. Starter motors contain twopowerful magnets which can be broken or cracked if themotor housing is deformed, dented or dropped.Hold the armature and commutator end cap against awork surface while sliding housing off the armature.Note: This allows the armature to remain in the end capfor inspection of brush contact to armature. Fig. 95.Fig. 95 - Removing Motor HousingRemove armature from commutator end cap.Clean all dirt or corrosion accumulations from thearmature, end cap, motor support, etc. The bearings,housing and armature should not be soaked in acleaning 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. The commutator may also be machinedwith the use of a diamond cutting tool to no less than1.23 (31.24 mm) inches outside diameter. Slots betweencommutator bars should be cleaned as shown in Fig. 96after cleaning or machining. If it is suspected that thearmature, field coil, magnets or motor housing isdefective, a new part should be tried in the motor. Ifproper testing equipment is available, check thesuspected armature or field coil to determine if it isdefective (opens or grounds).Fig. 96 - Cleaning CommutatorBriggs & Stratton- STARTERSGear Drive 12V & 120VThe brushes should be checked for poor seating, weakbrush springs, dirt, oil or corrosion. Brush springpressure should measure from 4.0 to 6.0 ounces. Ifbrushes are worn as shown in Fig. 97, replace. Checkto be sure brushes are not sticking in their holders. Useholders to retain brushes and spring during assembly.Fig. 97 - Checking BrushesCHECKING THE BRIGGS & STRATTON RECTIFIERCONTROL ASSEMBLY - 120 VOLT AC STARTERMOTORThe control assembly consists of a spring loaded switchassembly, cord assembly and rectifier assemblycontained in a housing assembly which is provided withan AC three wire ground receptacle. Fig. 98. The testprocedure for checking the rectifier control assembly isas follows:Fig. 98 - Exploded View - Control Assembly27
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