Table 4-2. Organizational Troubleshooting
Test or Inspection
Connect additional voltmeter to load terminals and take comparative readings to establish validity
of generator set voltmeter. Refer to figure 4-21 for DOD model MEP-014A, figure 4-22 for MEP-019A
and to figure 4-23 for model MEP-024A and the following instructions to replace a defective
Position LOAD ON/OFF switch (models MEP-014A and MEP-024A), or LOAD ON-OFF
FLASH switch (model MEP-019A) in OFF position.
Close fuel shutoff valve by rotating clockwise to shutoff fuel.
Place ignition switch in OFF position.
Disconnect power source.
Tag and disconnect leads from rheostat. (Figures 4-21, 4-22 or 4-23).
I.oosen setscrew securing rheostat knob on shaft and remove rheostat knob. (Figs 4-21,4-22
Remove nut securing rheostat to control panel and remove defective rheostat and discard.
Install a new rheostat on control panel and secure with nut.
Place rheostat knob over end of shaft and secure by tightening setscrew.
(10) Reconnect leads to rheostat.
(11) Reconnect power source.
(12) Place LOAD ON-OFF-FLASH switch (model MEP-019A), and LOAD ON/OFF switch (models
MEP-014A and MEP-024A), in OFF position.
(13) Rotate rheostat counterclockwise as far as it will go.
(14) Open fuel shutoff valve. Close the choke (move choke control lever away from flywheel) for
starting cold engine. Open choke (move toward flywheel) gradually as engine starts and
warms until choke is fully open.
(15) Place ignition switch in ON position.
(16) Wind starter rope around starter flange in clockwise direction. Pull rope briskly to start
(17) On model MEP-019A only, place LOAD ON-OFF-FLASH switch in FLASH position. When
engine has attainted rated speed, observe panel meter for a voltage indication. Release switch
when voltage reachesa minimum value of 100 volts.
(18) If generator output voltage on
model MEP-019A fails to develop after set has attained rated
speed, and the LOAD ON-OFF-FLASH
switch has been placed in FLASH position, field flash-
ing from an external source will be required. The field is flashed by momentarily connecting
a 12-volt DC source (with resistor of 20 ohms, 5 watts connected in series to terminals 8 and
7 of TB 2 (fig. 1-8). Terminal 8 is positive with respect to terminal 7. The series resistor may
be omitted if voltage polarity is strictly observed.
Reversing field flashing polarity from that indicated above will result in the
destruction of the voltage regulator, rendering the set inoperative.
3. GENERATOR OVERHEATS
Check generator for overloaded condition,
Inspect operating area for obstructions blocking proper ventilation.
Do not allow cleaning solvent to come into contact with generator windings or
insulation. Damage to the generator may result.