TROUBLESHOOTING
ENGINE TROUBLESHOOTING
If something is wrong with the engine, refer to the following table for the cause and its corrective measure.
Symptom (if)
Cause
Remedy
The engine is difficult to start or will not start.
•
No fuel flow.
•
Check the fuel tank and the fuel filter.
Replace filter if necessary.
•
Check the fuel valve position.
•
Air or water is in the fuel system.
•
Check to see if the fuel line coupler bolt
and nut are tight.
•
Bleed the fuel system. (See SERVICE
AS REQUIRED on page 84.)
•
In winter, oil viscosity increases, and en-
gine revolution is slow.
•
Use oils of different viscosities, depend-
ing on ambient temperatures.
•
The battery becomes weak and the en-
gine does not turn over quick enough.
•
Clean battery cables and terminals.
•
Charge the battery.
•
In cold weather, always remove the bat-
tery 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.
•
Insufficient or dirty fuel.
•
Check the fuel valve position.
•
Check the fuel system.
•
Air cleaner clogged.
•
Clean the element.
The engine stops suddenly.
•
Insufficient fuel.
•
Check the fuel valve position.
•
Refuel.
•
Bleed the fuel system if necessary.
Exhaust fumes are colored.
Black
•
Fuel quality is poor.
•
Too much oil.
•
Engine is overloaded.
•
Change the fuel and fuel filter.
•
Check the proper amount of oil.
•
Reduce engine load.
Blue white
•
The inside of exhaust muffler is damp
from fuel.
•
Injection nozzle trouble.
•
Fuel quality is poor.
•
Heat the muffler by applying load to the
engine.
•
Check the injection nozzle.
•
Change the fuel and fuel filter.
Engine overheats.
•
Engine overloaded.
•
Lower speed or reduce load.
•
Low coolant level.
•
Fill cooling system to the correct level;
check radiator and hoses for loose con-
nections or leaks.
•
Loose or damaged fan belt.
•
Adjust or replace fan belt.
•
Dirty radiator core or grille screens.
•
Remove all trash.
•
Coolant flow route corroded.
•
Flush cooling system.
Engine does not stop when key switch is
turned
“OFF”
.
•
Fuse blown (20 A)
•
Replace the fuse.
If you have any questions, contact your local KUBOTA dealer.
TROUBLESHOOTING
ENGINE TROUBLESHOOTING
96
ZD1211,ZD1221
