Figure 5-4. Testing Armature for Grounds

Figure 5-3. Pinion Gear Stopper Removal - TM-5-6115-584-34_63

Figure 5-8. Checking Armature Shaft Runout

TM-5-6115-584-34 Generator Set Diesel Engine Driven Tactical Skid Mtd. 30 Kw 3 Phase 4 Wire 120/208 and 240/416 Volts Manual
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TM5-6115-584-34 NAVFAC P-8-622-34 TO-35C2-456-2 (2) Testing Armature. (a) Testing Armature for grounds. Touch armature shaft and the end of each commutator bar with a pair of ohmmeter leads. There should be no continuity. If continuity is indicatd between any commutator bar and armature shaft, it indica- tes a grounded armature. Replace grounded arma- ture. See figure 5-4. (b) Testing Armature for shorted Coils. A growler is necessary to test for shorted coils. With the armature in the growler, turn the growler on and hold a thin steel strip parrallel over the armature surface. Turn qrowler on, and if the steel strip vibrates or is attracted to the armature surface, the armature is shorted or grounded. Turn off growler, rotate armature one- quarter turn and repeat test. Do this for one complete revolution of armature. See figure 5-5. If armature has a short or is grounded, replace it. (c) Testing Armature for Open Coils. Test coils for continuity with ohmmeter. Place one lead on commutator bar, other lead on the next bar. If there is discontinuity (infinite resistance), Figure 5-4. Testing Armature for Grounds Figure 5-5. Testing Armature for Shorted Coils Figure 5-6 Testing Armature for Open Coils the reading indicates open coil. See figure If armature has an open coil, replace it. 5-6. C h a n g e 7 5 - 5

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