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MMG25I-35D-45I-55DF4 Operating Manual
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Section 5 - Troubleshooting
TROUBLESHOOTING AUTOMATIC SHUTDOWN CONDITIONS
WARNING
Allow engine to cool before performing any troubleshooting procedures. Contacting
the engine when it is hot will cause personal injury.
Low Fuel Level Shutdown
1. Check fuel level on the Liquid Crystal Display (LCD) window. Verify the unit is sitting level to ensure an accurate
reading.
2.
Check for leaks in fuel tank. The fuel tank should not run dry under normal circumstances. The engine con-
troller will shut the engine down when there is five percent of fuel remaining in the tank.
3.
If fuel level is good and no leaks are found, check the fuel level sender and the connecting wiring for dam-
age. To check for continuity between the sender and the engine controller, remove the appropriate bolts
from the control panel to access the inside of the control box. See the appropriate DC wiring diagram
for the proper path between the engine controller and the fuel level sender.
Low Oil Pressure Shutdown
1. Check engine oil level with the dipstick. The engine controller will shut the engine down when oil pressure is
less than 20 psi (138 kPa). Add oil if required.
2.
Visually inspect engine for oil leaks.
3.
If oil level is good, restart the unit and verify the loss of oil pressure. Shut the engine down immediately if the
oil pressure value does not read 5 psi (34 kPa) within five seconds.
4.
Check oil pressure sender. To identify corrective action, see the troubleshooting section of the engine oper-
ator’s manual.
Low Coolant Level Shutdown
1. Allow engine to cool.
2.
Check coolant level in the radiator. To access the radiator cap, remove the access panel from the top of the
enclosure 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.
3.
Inspect coolant hoses, engine block and water pump for visible leaks.
4.
Check engine oil to verify no coolant has mixed with it (oil will appear milky if coolant is present). For addi-
tional information, see the engine operator’s manual.
High Coolant Temperature Shutdown
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 the coolant 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 enclosure.
