Kubota SQ-1120, Operator'S Manual, Page: 57 / 63

TROUBLESHOOTING 42
B
When Engine must be Stopped
Immediately
B
When Engine Overheats
Cause Countermeasures
Engine
revolution
suddenly
decreases or
increases. *Check the adjustments, injection
timing and the fuel system.
Unusual sound
is heard
suddenly. *Check all moving parts carefully.
Color of exhaust
suddenly turns
dark. *Check the fuel injection system,
especially the fuel injection nozzle.
*Check for overload condition.
Bearing parts
are overheated. *Check the lubricating system.
Oil lamp lights
up during
operation.
*Check the lubricating system.
*Check, if the engine bearing
clearances are within factory specs.
*Check the function of the relieve
valve in the lubricating system.
*Check pressure switch.
*Check filter base gasket.
Cause Countermeasures
Engine oil
insufficient *Check oil level. Replenish oil as
required.
Fan belt broken
or elongated *Check all moving parts carefully.
Coolant
insufficient *Replenish coolant.
Excessive
concentration of
antifreeze *Add water only or change to coolant
with the specified mixing ratio.
Radiator net or
radiator fin
clogged with
dust *Clean net or fin carefully.
Inside of
radiator or
coolant flow
route corroded *Clean or replace radiator and parts.
Fan or radiator
or radiator cap
defective *Replace defective parts.
Thermostat
defective *Check thermostat and replace if
necessary.
Temperature
gauge or sensor
defective *Check temperature with
thermometer and replace if
necessary.
Overload
running *Reduce load.
Head gasket
defective or
water leakage *Replace parts.
Incorrect
injection timing *Adjust to proper timing.
Unsuitable fuel
used *Use the specified fuel.
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