Figure 17. Generator belt guard, removal and
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
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.
adjustment must be made with the voltage regulator off
the unit. Adjust the voltage regulator as shown by figure
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.
In the following procedures, the
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.
Do not adjust the setting of the
current regulator unit above the