listed (except when malfunction and cause are
obvious), or is not corrected by listed corrective
actions, you should notify higher level mainte-
b. Table 3% lists the common malfunctions that
you may find during the operation or mainte-
nance of the generator sets or their components.
You should perform the tests/inspections and cor-
rective actions in the order listed.
Before you use this table, be sure you have per-
formed all normal operational checks. If you have
a malfunction which is not listed in this table,
notify the next higher level of maintenance.
Air Force users may perform maintenance within
the scope of their capabilities.
Table 3-3. TROUBLESHOOTING
TEST OR INSPECTION
1. ENGINE FAILS TO START OR MAL-
Check the fuel tank (figs. 4-12 and 4-I4) for
the proper fuel level..
Fill the fuel tank (figs. 4-12 and 4-14) only to
within one inch of the top to allow
expansion of the fuel.
Visually inspect the position of the fuel selec-
tor valve (fig. 2-1).
Place the fuel selector valve in the correct
position which can be determined by reading
the instruction plate (fig. 21) located on the
right side of the generator set.
Check the auxiliary fuel hose for an air leak.
Tighten any loose connections.
Inspect the auxiliary fuel supply valve for the
Position the auxiliary fuel supply valve in the
Inspect the fuel filter for dirt.
Clean the fuel filter. Refer to Appendix A for
the appropriate service document.
Table 3-3. TROUBLESHOOTINGContinued
TEST OR INSPECTION
2. NO POWER AT LOAD
Check the load lines for improper connections
Connect load lines properly or if broken,
repair by replacing as follows:
a. Model MEP015A (AC Unit). Use cable
with a minimum wire size of No. 12 AWG.
b. Model MEP025A (DC Unit). Use, as a
minimum size, cable of No. 4 AWG for
distances up to 25 ft. For longer distances,
No. .3, No. 2, or No. 1 AWG sizes should be
Step 2. Check the circuit breaker (B, fig. 2-3) or load
switch (A, fig. 2-3) to see if it is in the OFF
Place the circuit breaker or load switch in
the ON position. If the circuit breaker will
not stay in the ON position, refer the mal-
function to the next higher maintenance
3. OUTPUT VOLTAGE HIGH OR LOW
Check to see if the variable resistor (fig. 2-3)
is correctly adjusted. The voltmeter reading
will change as the variable resistor knob is
Turn the variable resistor knob (labeled ad-
just volts and increase volts) until the
required voltage is attained.
Inspect the total load, it may be too large for
Reduce the load and see if the malfunction is
corrected. If not, refer to next highter level of
4. UNIT CAUSES RADIO INTERFERENCE
Inspect the load lines far loose connections.
Tighten all load lines connections securely.
Step .2. Inspect established ground for loose connec-
Tighten all ground connections securely.
Section V. MAINTENANCE PROCEDURES
stopped. Failure to observe this safety
This section contains information on the main-
precaution could result in severe elec-
tenance of the equipment that is the responsibil-
trical shock or death by electrocution.
ity of the operator.
3-8. Fuel Strainer, Fuel Filterr and Air
Before servicing any part of the genera-
a. General. The fuel tank is equipped with a
tor set, make certain that the engine is
removable strainer (5, fig. 4-16) that will strain