Table 2-2. Generator Set, Troubleshooting - Continued
TEST OR INSPECTION
Disconnect linkage between throttle arm (of fuel injection pump) and hydraulic governor. Set throttle arm
to mid-position and start engine. Adjust the throttle arm for correct generator output frequency.
If it is possible to adjust throttle for correct frequency, hydraulic governor should be tested and repaired
6. GENERATOR OUTPUT VOLTAGE INCORRECT OR FLUCTUATING.
Inspect motor-operated potentiometer B5 (4, figure 4-10) according to paragraph 4-21 and refer to
paragraph 4-23 for testing and replacement procedures.
Shut down engine. Disconnect and tag exciter field leads from F- and F+ terminals of voltage regulator
VR101. Observing polarity, connect exciter field leads to DC power supply (adjustable from 0 to 20 volts
and capable of delivering 2 amperes). Start engine. Adjust power supply for required generator output
voltage (as indicated on generator control panel).
If it is possible to obtain correct generator output voltage, proceed to next step.
If generator output voltage is still incorrect, generator should be tested and repaired as required. (see
Check PM generator output terminals 3 and 4 of VR1; voltage should be 135V AC + 15 percent.
If voltage is out of tolerance, disconnect leads from terminals 3 and 4 and recheck voltage at open leads
coming from generator.
If voltage is within tolerance, voltage regulator VR101 should be tested and repaired as required (see
Chapter 4, Section V).
If voltage is still out of tolerance, PM generator (part of main generator G1) should be tested and
repaired as required (see Chapter 11).
Section IV. REMOVAL AND INSTALLATION OF MAJOR COMPONENTS
2-12. GENERAL. This section contains procedures for the removal and installation of major components. Major
components include the control cubicle, AC-DC control box assembly, external power box assembly, radiator assembly,
generator, and the engine.
2-13. CONTROL CUBICLE. The control cubicle, figure 2-1, is mounted on four brackets attached on one side to the
AC-DC control box assembly, and on the other side, to the external power box assembly.