ARMY TM 9-6115-604-12
NAVY NAVFAC P-8-633-12
SECTION IV. TROUBLESHOOTING
a. Table 3-3 contains troubleshooting information for locating and correcting operating troubles which may develop
in the generator set. Each malfunction for an individual component, unit, or system is followed by a list of
inspections or tests which will help you to determine probable causes and corrective actions to take You should
perform the Inspections/tests and corrective actions In the order listed.
b. This manual does not list all malfunctions that may occur, nor all Inspections or tests and corrective actions. If
a malfunction is not listed or cannot be corrected by listed corrective actions, notify your supervisor.
Before you use Table 3-3, be sure you have performed all applicable PMCS operating checks.
Table 3-3. Operator Troubleshooting
TEST OR INSPECTION
1. ENGINE FAILS TO CRANK.
Check annunciator panel for any alarms
With utility power available, check BATTERY CHRG AMPS and BATTERY CHRG VOLTS meters on
battery charger. Current and voltage reading should be within 0 and 5 amperes and 26 to 28 V dc,
If readings are not within limits indicated, proceed to Step 3, Step 4, and Step 5, as required
Check for defective, corroded, or loose battery cables and battery terminals
If cables or terminals are defective, refer to paragraph 3-9 for service or replacement procedures.
Check electrolyte level of batteries Level should be 3/8 Inch above the plates.
If necessary, add distilled or clean water to required level.
Test the batteries In accordance with paragraph 3-10.
Service or replace batteries, as required, in accordance with paragraph 3-10.
Test speed switch in accordance with paragraph 4-28
Replace switch If defective.
2. ENGINE CRANKS BUT WILL NOT START.
Check air control valve to ensure lever Is set to open.
If lever Is in closed position, reset to open position and try to start engine.
Check air restriction Indicator.
If indicator shows amber or red, service filters In accordance with paragraph 3-15.
Test batteries In accordance with paragraph 3-10.