Kubota zd 331, Manual

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79 TROUBLESHOOTING
TROUBLESHOOTING
ENGINE TROUBLESHOOTING
If something is wrong with the engine, refer to the table below for the cause and its corrective measure.
If you have any questions, contact your local KUBOTA Dealer.
Trouble Cause Countermeasure
Engine is difficult to start or
won't start
A
No fuel flow.
A
Check the fuel valve position.
A
Check the fuel tank and the fuel filter.
Replace filter if necessary.
A
Air or water is in the fuel system.
A
Check to see if the fuel line coupler bolt and
nut are tight.
A
Bleed the fuel system. (See "SERVICE AS
REQUIRED" in "PERIODIC SERVICE"
section.)
A
In winter, oil viscosity increases,
and engine revolution is slow.
A
Use oils of different viscosities, depending on
ambient temperatures.
A Battery becomes weak and the
engine does not turn over quick
enough. A Clean battery cables and terminals.
A
Charge the battery.
A
In cold weather, always remove the battery
from the engine, charge and store it indoors.
Install it on the machine only when the
machine is going to be used.
Insufficient engine power.
A
Insufficient or dirty fuel.
A
The air cleaner is clogged.
A
Check the fuel valve position.
A
Check the fuel system.
A Clean the element.
Engine stops suddenly.
A
Insufficient fuel.
A
Check the fuel valve position.
A
Refuel.
A
Bleed the fuel system if necessary.
Exhaust fumes are
colored.
Black
A Fuel quality is poor.
A
Too much oil.
A
Engine is overloaded.
A Change the fuel and fuel filter.
A
Check the proper amount of oil.
A
Reduce engine load.
Blue
white
A
The inside of exhaust muffler is
dumped with fuel.
A
Injection nozzle trouble.
A
Fuel quality is poor.
A
Heat the muffler by applying load to the
engine.
A
Check the injection nozzle.
A
Change the fuel and fuel filter.
Engine overheats.
A
Engine overloaded.
A
Lower speed or reduce load.
A Low coolant level. A Fill cooling system to the correct level;
check radiator and hoses for loose
connections or leaks.
A
Loose or defective fan belt.
A
Adjust or replace fan belt.
A Dirty radiator core or grille
screens. A Remove all trash.
A
Coolant flow route corroded.
A
Flush cooling system.