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

Fig. 3. Sectional View of Starting Motor with Heavy Duty Sprag Clutch

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. 4. Sectional View of Starting Motor with DR-250 Heavy Duty Drive Regardless of the construction, never operate the starting motor more than 3( seconds at a time without pausing to allow it to cool for at least 2 minutes Overheating caused by excessive cranking will seriously damage the motor. For the most part a volt-ampere test (SE-2283) will be used in performing the starter tests and the instruction manual supplied with the tester will pro-vide the detailed instructions using the volt-ampere tester. NOTE: All illustrations of starting motor and circuit tests show leads connected for NEGATIVE grounded system. Reverse the positions of the leads when testing a POSITIVE grounded system. Make sure the volt se- lector switch on the volt-ampere tester is positioned properly for the voltage system being inspected. Test No 1 - Cranking Voltage Test This test tells us the overall condition of battery, starter, cables or switches to determine if sufficient volt-age is available to operate ignition sys-tem when starter is in operation. Connect voltmeter leads at the starter observing the polarity, Fig. 5. Disconnect secondary coil lead to prevent engine from starting. Crank engine noting voltmeter reading (should be 9.6 volts or better with 12- volt electrical system). If a reading of less than 9.6 volts is found, proceed to the next test. . CGES-230 - Page 5 PRINTED IN UNITED STATES OF AMERICA

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