TROUBLESHOOTING
138
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 cleaner
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
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