Yanmar Lx410 Operator's Manual page 154

The problem is:
The engine runs
roughly or stalls
frequently
Lx410/450/490 Operator's Manual
17. TROUBLESHOOTING
The possible cause(s) are:
1. A problem in the electrical
2. A problem in the fuel
3. A problem in the cooling
4. A problem in the engine mechanical
Remedy:
1. Electrical system
• Check whether the battery is fully
charged.
• charge the battery
• Check for loose or corroded the
battery terminals and battery cables.
• tighten the loose battery terminals
• clean the corroded battery
terminals and battery cables
2. Fuel system
• Check whether the fuel level is
sufficient.
• add specified fuel
• Check whether the used fuel
specification is correct.
• use correct fuel specification
• Check whether there is water in the
sediment bowl.
• remove the water and clean the
sediment bowl
• Check whether the fuel filter is
clogged.
• replace the fuel filter
• Check whether air is present in the
fuel system.
• bleed air from the fuel system
• Check whether there is leak or bent
in the fuel line.
• contact YOUR LOCAL YANMAR
TRACTOR DEALER
• Check whether the fuel injection
pump is out of timing.
• contact YOUR LOCAL YANMAR
TRACTOR DEALER
3. Cooling system
• Check whether the air intake system
is clogged.
• clean the air intake system
• Check whether coolant temperature
is too low.
• contact YOUR LOCAL YANMAR
TRACTOR DEALER
4. Engine mechanical system
• Check whether the engine idle speed
is too low.
• Check whether the valve clearance is
correct.
• contact YOUR LOCAL YANMAR
TRACTOR DEALER
17-3