ENGINE DIVISION SERVICE MANUALELECTRICALFig. 11. Testing Armature for CG-6685 Short CircuitsHeavyDutyDriveClutchMotor1.Disconnect field coil connector from solenoid motorterminal and lead from solenoid ground terminal.2.Motors which have brush inspection plates, removethe plates, then remove the brush lead screws whichdisconnect the field leads from the brush holders.3.Separate the commutator end frame from the fieldframe.4.Separate the nose housing and field frame from thelever housing.5.Remove the armature and clutch assembly fromlever housing.6.Separate solenoid from lever housing by pullingapart.INSPECTION AND REPAIR1.BrushesandBrushHolders- Inspect the brushes forwear. If they are worn down to one-half their originallength, when compared with a new brush, theyshould be replaced. Clean brush holders and besure that the brushes will not bind in the holders.The full length of the brush surface should ride onthe commutator with spring tension to provide a goodcon-tact. Inspect the brush leads and screws to be surethey are tight and clean.2.Armature- Inspect the armature to be sure there areno short circuits, open or grounds.a.Short circuits are located by turning the armaturein a growler while holding a steel strip on thearmature. The steel strip will vibrate on the areaof the short circuit, see Fig. 11.b.Opens are usually found where the conductorsare joined to the commutator. Loose or poorconnections will cause arcing and burning of thecommutator. If the bars are not burned too bad,resolder the leads in the riser bars and turn thecommutator down in a lathe. Then under cut theinsulation between the commutator bars 1/32".c.Grounds in the armature can be found using atest lamp and prods, see Fig. 12. If the lamplights when one prod is positioned on thecommutator and the other prod on the armaturecore or shaft the armature is grounded.CGES-230 - Page 12PRINTED IN UNITED STATES OF AMERICA
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business
