Fig. 9. No Load Test Hookup

Fig. 10. Removing retainer from Snap Ring

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. 9. No Load Test Hookup Test No 4 - No Load Test Before performing the "No Load Test" look the motor over. The pinion should be checked to be sure it is free by turning it on the screw shaft. The armature should be checked so that it is free to rotate by prying the pinion with a screw driver. Tight bearing, bent armature shaft or loose pole shoe screws could cause the armature not to turn freely. The motor should be disassembled if the armature does not turn freely. However, if the armature will rotate freely, the next step is to give the motor a no load test before disassembly. Connect the starting motor in series with a fully charged battery of the specified voltage, an ammeter capable of reading several hundred amperes, and a variable resistance. Also connect a voltmeter as illustrated in Fig. 9 from the motor terminal to the motor frame. An R.P.M. indicator is necessary to measure armature speed. Obtain the specified voltage by varying the re-sistance unit, then read the current draw and the armature speed and com-pare these readings with the values listed in the specifications. CGES-230 - Page 10 PRINTED IN UNITED STATES OF AMERICA

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