
TROUBLESHOOTING
84 JH Series Operation Manual
Engine is not running smoothly
Operation failure of injection
valve
Nozzle operation failure Replace
Broken fuel valve spring Replace
Uneven fuel injection quantities Clogged fuel filter Replace
Faulty operation of regulator valve Replace
Air trapped in fuel injection system Bleed air from system and prime system
Faulty operation of fuel supply pump Repair
Other Overload operation Reduce load
Moving parts seized Disassemble, inspect and conduct servicing
Slippage of gear box Inspect and repair
Engine stops suddenly
No fuel feed Fuel level in fuel tank is low Add fuel and prime
Air trapped in fuel system or fuel
injection
Bleed air
Water trapped in fuel tank Drain water from drain cock and fuel pipe, conduct
priming
Fuel cock closed Inspect and repair as necessary
Clogged fuel filter Replace
Broken fuel pipe Replace
Failure of fuel supply pump Replace
Other Moving parts seized Disassemble and repair, or replace
Controller defects system error Inspect DTC and conduct servicing
Abnormal smoke color
Failure of fuel injector Clogged injection nozzle Replace
Sticking needle valve Replace
Reduction in injection pressure Replace
Poor atomization Replace
Carbon deposit Clean
Turbo-charger failure
(If equipped)
Clogged air filter Clean
Dirty compressor side Clean
Clogged turbine side Clean
Damaged bearing Replace
Other Overload operation Reduce load
Lubricant level too high Lower the oil level
Accumulated carbon deposit at
intake/exhaust valve
Clean
Dirty air cooler (If equipped) Clean
Improper fuel Replace with proper fuel
Clogged intake/exhaust valve Clean
Symptom Probable Cause Measure
Insufficient output
Symptom Probable Cause Measure
4JH45_4JH57_4JH80_4JH110_EN_OPM.book 84 ページ 2013年10月8日 火曜日 午後3時58分
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