EF393T OM
66
TROUBLESHOOTING
If abnormal operations are found, stop the engine and found a problem by referring to the following table.
1. Engine
PROBLEM CAUSE
REMEDY
Engine hard
to start or
not start
Starter motor
runs.
No fuel or improper fuel
Fill fuel.
Drain wrong fuel and fill proper fuel.
Water, dirt, or air in fuel system
Drain, flush & bleed fuel system.
Clogged fuel filter
Clean or replace fuel filter.
Fuel shut-off valve closed
Open fuel shut-off valve.
Accelerator lever not pulled
Pull throttle lever.
Engine oil too heavy
Use oil of proper viscosity.
Starter motor
doesn’t run.
Reverser lever is not set to “N”.
Set the lever to neutral.
PTO shift lever is not set to “N”.
Set the lever to neutral.
Low voltage
Charge battery.
Slow blow fuse blown
Replace slow blow fuse.
Engine runs irregularly or
stalls frequently
Vent in fuel tank cap clogged
Clean cap in solvent and blow dry.
Fuel filter clogged
Clean or replace fuel filter.
Water, dirt, or air in fuel system
Drain, flush & bleed fuel system.
Dirty or faulty injection nozzles
See your YANMAR dealer.
Improper type of fuel
Use proper fuel.
Engine solenoid linkage out of
adjustment
See your YANMAR dealer.
Insufficient oil
Add oil
Engine knocks
Engine overheating
See "Engine overheats".
Idle speed too slow
Check idle speed.
Improper type of fuel
Use proper fuel.
Lack of engine power
Engine overloaded
Reduce load or shift to lower gear.
Air cleaner element clogged
Clean air cleaner element.
Clogged fuel filter
Clean or replace fuel filter.
Improper type of fuel
Use proper fuel.
Engine overheating
See "Engine overheats".
Improper ballast
Adjust ballast to load.
Hydraulic stop valve closed
Open stop valve.
Improper implement mounted
Check required horsepower for
implement.