50. Generator and Adjusting Support

Figure 19. Generator and voltage regulator, on-engine testing.

TM-5-4320-215-12 Pump Centrifugal Frame Mounted 1 1/2 In. Gasoline Engine Driven Less Engine (Barnes Model 17570) NSN 4320-00-252-9466 Manual
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TM 5-4320-215-12 Figure 17. Generator belt guard, removal and installation. Figure 18. Generator drive belt, adjustment, removal, and installation. 50. Generator and Adjusting Support a. Defects in the battery-charging system are indicated by a high-charging rate when the batteries are fully charged or by a low-charging rate when the batteries are low. In the event that trouble develops in the battery-charging system, perform the on-engine testing of the generator and voltage regulator as shown by figure 19. b. Remove and install the generator belt guard and belt (par. 49). c. Remove and install the generator and adjusting support as shown by figure 20. 51. Voltage Regulator and Shield Box a. Refer to figure 19 for on-engine testing of the voltage regulator. b. Remove and install the voltage regulator and shield box as shown by figure 21. c. Clean and inspect the voltage regulator as shown by figure 22. d. Perform the voltage regulator continuity test as shown by figure 23. e. Mechanical Adjustment. Mechanical adjustment must be made with the voltage regulator off the unit. Adjust the voltage regulator as shown by figure 24. f. Electrical Adjustment. A low voltage test set including a voltmeter, ammeter, fixed and variable resistors, carbon pile, and suitable switching devices, should be used to make the electrical adjustments on the voltage regulator. Mount the voltage regulator in operating position on or near the unit. Electrically adjust the voltage regulator as shown by figure 25. Note In the following procedures, the generator frame, the voltage regulator base, and the battery ground terminal must be connected to each other or a common ground. g. Testing after Adjustment. Install the voltage regulator cover and test the operation of the three units at room temperature. Repeat adjustment procedures as necessary until the settings cease to drift. Replace the voltage regulator if it fails to respond to adjustment. Caution Do not adjust the setting of the current regulator unit above the rated output of the battery- charging generator. 36

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