Figure 13 - Removing Drive End Housing From Rotor Shaft.

TM-5-3820-256-24-4 Drilling System Well Rotary Truck Mounted Air Transportable 600 Feet Capacity Model LP-12 NSN 3820-01-246-4276 Manual
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Figure 13 - Removing Drive End Housing From Rotor Shaft. 16. Remove four screws and bearing retainer (Figure 14) and press bearing out of drive end housing. Figure 14 - Removing Drive End Bearing Retainer. COMPONENT TESTING Before performing these tests, carefully inspect all parts for wear, cracks, breakage, or other mechanical defects. Discard all damaged parts. DIODE TESTS These tests may be performed on heat sink assemblies without removing them from the end housing. If they are tested in this manner, remove the stator and be sure that the red and black leads are disconnected from the regulator and not touching each other. Disconnect the capacitor across the lower end of the heat sinks. Diodes are tested to insure that they only pass current in one direction. Diodes which do not allow current to flow in either direction are open while diodes passing current both ways are shorted. Diodes should be checked with a diode tester, but in emergencies where one is not available, an ohmmeter or a battery powered test light may be substituted. Positive Heat Sink Tests The positive heat sink is the one to which the positive output terminal is connected. The square hole in the terminal end of the positive heat sink is larger than the terminal hole of the negative heat sink. 1. Connect the positive lead of the diode tester, ohmmeter, or test light to the positive heat sink and touch the negative test lead to each of the three diode terminals (Test 1, Figure 15). A high resistance should be indicated and if a test light is being used, it should not light. If any of the three diodes shows a low resistance, or the test lamp lights, the diode is shorted. See IMPORTANT on next page. Figure 15 - Positive Heat Sink Tests. 2. Reverse the test leads so that the negative test lead is connected to the positive heat sink. The positive test lead should now be touched to each diode terminal (Test 2, Figure 15). A low resistance reading should be obtained. If a high resistance reading is obtained, or the test lamp fails to light, an open diode is indicated. See IMPORTANT on next page. Negative Heat Sink Tests 1. Connect the negative test lead to the negative heat sink and touch the positive test lead to each diode terminal (Test 1, Figure 16). If a low resistance reading is obtained, or if the test lamp lights, the diode is shorted. See IMPORTANT on next page. CTS-4043A - Chapter II -- Page 7

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