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If the excavator does not show the desired performance, or when trouble arises, refer to the
table below and undertake appropriate measures.
TROUBLESHOOTING
Trouble Cause
Fuel is too viscous
Air or water in the fuel
system
Oil viscosity is too high
the engine runs
sluggishly in winter
Battery is almost dead;
insufficient
compression
Starting
difficulties
Low fuel level
Clogged air cleaner
Poor fuel
Too much engine oil
Worn or torn fan belt
Coolant level too low
Corroded coolant pipes
Engine oil level too low
Use of poor fuel
Radiator grill or fins
are clogged
Defective radiator cap
(Evaporation)
Continuous operation
under full load
Coolant is
contaminated with rust
from the cylinder head
or crank case
Low fuel level
Insufficient
engine power
Abnormal
exhaust gas
colour
Water
temperature
in red zone
(Overheating)
Engine
suddenly stops
Countermeasure
* Check fuel tank and filter
* Remove impurities and water
* If necessary, replace filter
* Remove water from the fuel tank
* Check fuel pipe joint bolts and nuts for
looseness
* Purging of the fuel system (for fuel filter and
injection pump, see "PURGING OF THE FUEL
SYSTEM" in "OTHER ADJUSTMENTS AND
REPLACEMENTS".)
* Pour hot water over the radiator
* Use oils of different viscosities depending on
the ambient temprature. (Use SAE10W,
SAE10W-30 or SAE10W-40)
* Recharge battery
* Check fuel and add if necessary
* Clean the air filter element
* Use high quality fuel
* Drain engine oil to prescribed oil level
* Adjust or replace
Thermostat is defect * Replace
Defective seal of the water pump
* Replace
* Fill to prescribed level
* Clean
* Fill to prescribed level
* Use prescribed fuel
Cylinder head gasket is
damaged (Coolant loss)
Maladjustment of fuel injection
* Replace
* Readjust ignition timing
* Clean
* Replace
* Reduce load
* Replace coolant fluid and add anti-rust
* Check fuel and add if necessary
* Purge the fuel system
Engine
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