Hitachi ZAXIS 120-3 class, Operator'S Manual

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TROUBLESHOOTING
11-5
ENGINE
Problem Cause Solution
Exhaust Gas is White Wrong fuel Drain tank. Use correct fuel.
Cold engine Run engine until warm.
Thermostat faulty or too “cool” See your authorized dealer.
Injection pump out of time See your authorized dealer.
Coolant leakage into engine cylinder See your authorized dealer.
Turbocharger Excessively
Noisy or Vibrates
Bearings not lubricated Insufficient oil pressure.
Check for restricted turbocharger oil line.
Worn bearings See your authorized dealer.
Air leak in engine, intake or exhaust
manifold
Inspect, repair.
Improper clearance between turbine
wheel and turbine housing
See your authorized dealer.
Broken blades on turbine Remove exhaust elbow and air inlet hose
and inspect.
Oil Dripping from
Turbocharger Adapter
Damaged or worn bearings and/or
worn seals
See your authorized dealer.
Inspect and clean air cleaner.
Check for proper engine service intervals
or dirt enter into engine.
Excessive crankcase pressure Check vent tube to ensure tube is not
plugged.
Clean.
Turbocharger oil return line carbon
build up where line passes exhaust
manifold
Remove line.
Inspect, clean.
Excessive Drag in
Turbocharger Rotating
Members
Carbon build-up behind turbine wheel
caused by combustion deposits
Inspect, clean.
Dirt build-up behind compressor wheel
caused by air intake leaks
Inspect, clean.
Bearing seizure or dirty or worn bear-
ings, caused by excessive temperature,
unbalanced wheel, dirty oil, oil starva-
tion, or insufficient lubrication
See your authorized dealer.