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Troubleshooting
Table 2 - Troubleshooting Automatic Shutdown Conditions
HIGH COOLANT
TEMPERATURE SHUTDOWN
OVERCRANK SHUTDOWN
OVERSPEED OR UNDER-
SPEED SHUTDOWN
44
1. Check coolant level in the overflow jug.
2. Restart engine and read the coolant temperature to verify a high
coolant temperature shutdown. Stop engine immediately if cool-
ant temperature is 230°F (110°C) or more.
3. Allow engine to cool. Add coolant to the overflow jug if it is low
and check the level of coolant in the radiator. To access the
radiator cap, remove the access panel from the top of the enclo-
sure directly above the radiator. Add coolant until it is 3/4 in. (2
cm) below the filler neck. Secure the radiator cap back into its
original position.
4. Check radiator shroud and ducting for blockage and remove any
foreign matter.
5. Inspect coolant hoses, engine block and water pump for visible
leaks.
6. Check tension of serpentine drive belt for the water pump.
7. If no other problems are found, remove load on the generator and
restart engine. Check coolant temperature and shut engine down
immediately if it starts to overheat. See the engine operator's
manual for additional information on engine overheating.
1. Check fuel level in the tank.
2. Check for proper operation of the fuel pump.
3. Check the air filter for blockage.
4. If engine will not start, see the engine operator's manual for
additional information on troubleshooting starting problems.
1. Disconnect all loads and restart the generator. Read the frequency
(Hz) on the LCD display. With no loads on the generator, the
frequency should read 60.0 Hz.
2. If the frequency is above or below 60.0 Hz, the engine speed will
have to be adjusted. See the engine operator's manual for throttle
adjustments on mechanically governed units and see the elec-
tronic governor manual for electronically controlled units.
MMG330DI4-480DI4 Operating Manual
33797 C
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