Fig. 5. Cranking Voltage test

Fig. 4. Sectional View of Starting Motor with DR-250 Heavy Duty Drive

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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ENGINE DIVISION SERVICE MANUAL ELECTRICAL Fig. 5. Cranking Voltage test Test No 2 - Battery Capacity Test The battery capacity test is per-formed to determine if the battery is in satisfactory condition. See "Battery" Section B. If the battery passes this test, continue the next test. Test No 3 - Voltage Drop Test Generally, the starting or cranking circuit is a series circuit from the battery insulated post to the starting motor solenoid, to the motor, to ground (chassis) and return to the battery ground post, Fig. 6. In the cranking circuit we also have a cranking control circuit, Fig. 6. In this circuit the solenoid is controlled or operated by closing an ignition switch or push button starting switch at the instrument panel. In this cranking control circuit there are frequently some safety switches such as transmission "neutral safety switch" and/or vacuum-operated cutout switch. CGES-230 - Page 6 PRINTED IN UNITED STATES OF AMERICA

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