9-7
TABLE 9-1. TROUBLESHOOTING GENSET FAULTS (CONT.)
Some genset service procedures present hazards that can result in severe personal
injury or death. Only trained and experienced service personnel with knowledge of fuels, electricity,
and machinery hazards should perform genset service. See Safety Precautions.
Accidental or remote starting can cause severe personal injury or death. Before removing a panel or
access door, disconnect the negative (−) cable from the battery to prevent the engine from starting.
WARNING
LOW AC FREQUENCY—CODE NO. 15
(During normal operation Frequency fell to less than 90% of nominal for more than 8 seconds)
Corrective Action:
1. Push the genset line circuit breaker OFF and de-energize the PTO clutch, if so equipped. If the
genset now runs, reduce the number of electrical and mechanical (PTO) loads, especially those with
high motor starting loads, such as air conditioners.
2. Check the fuel tank and fill as necessary. (Note: The arrangement of pickup tubes in the fuel supply
tank probably is such that the genset will run out of fuel before the propulsion engines.)
3. Prime the engine fuel system for at least 30 seconds (p. 3-3).
4. Remove combustion air or exhaust system blockages.
5. Check all fuel fittings for fuel and air leaks and tighten as necessary. (Air bubbles can disrupt fre-
quency.)
6. Replace fuel filters (p. 4-6).
7. Check for contaminated fuel by connecting to a source of known fuel quality.
8. Conduct a fuel pump test and replace if necessary (p. 6-4).
9. Check for proper operation of the governor actuator and replace if necessary (Page 5-9).
10. Check compression and cylinder leak down and service a worn engine. See Table 6-1 for the ap-
propriate engine workshop manual.
11. Service the fuel injectors. See Table 6-1 for the appropriate engine workshop manual.
12. Check for proper operation of the internal governor mechanism. See Table 6-1 for the appropriate
engine workshop manual.
13. Replace the genset controller (p. 5-1).
Redistribution or publication of this document,
by any means, is strictly prohibited.
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