JLG M450 ANSI Service Manual - Manual (Page 109)

SECTION 3 - CHASSIS & TURNTABLE
3121127 – JLG Lift – 3-69
Troubleshooting
Table 3-11. Troubleshooting
Flash Code Problem Solution
- Unit Off / Disabled (engine will not
crank) Check position of selector switch.
Verify that the inhibit run is released.
Check the warning LED. Remedy fault if present and restart the RBS.
Check the start battery voltage.
Check control fuse.
Check for loose wiring or connection.
1-1 Low Oil Pressure Check oil level.
Check oil supply lines.
Refer to Kubota Workshop manual WSM OC60/80/95.
Verify correct operation of oil pressure switch with a test gauge.
1-2 High Engine Temp. Check for obstructions in the cooling airflow to the engine.
Check that the ambient temperature is within the design limits of the engine.
Verify correct operation of engine temperature sensor.
1-3 Overspeed Verify setting of governor lever. Readjust, if required.
Refer to Kubota Workshop manual WSM OC60/80/95.
1-4 Underspeed Ensure there is an adequate supply of fuel to the engine.
Ensure there is an adequate supply of combustion air to the engine. Check air
cleaner.
Verify setting of governor lever. Readjust if required.
Refer to Kubota OC60 Engine Manual.
Overcrank Check fuel level.
Check fuel connections.
Verify operation of fuel solenoid and fuel pump.
Check the start battery voltage.
If the engine exhaust contains white smoke then fuel is entering the engine but
the engine is not firing. Refer to the Kubota OC60 Engine Manual for further
checks.
If the ambient temperature is low, verify that the heater and/or glow plug are
operating.
1-5 No Speed Signal Check wiring connections.
2-1 Overvoltage Check alternator output voltage.