TROUBLESHOOTING
JH Series Operation Manual 137
TROUBLESHOOTING CHART
Symptom Probable Cause Measure
Indicators light on the
instrument panel and alarm
sounds during operation
Shift to low speed operation immediately, and check which indicator has come on. Stop the
engine and inspect. If no abnormality is identified and there is no problem with operation, return
to port at lowest speed and request repairs.
Engine does not start or starts with difficulty
Pinion gear does not engage Loose terminal of battery/engage
magnet
Tighten
Poor contact of starting switch Correct with sandpaper or replace
Open coil of magnet switch Replace
Burr at gear tooth tip Correct
Poor clearance between pinion and
ring gear
Correct
Pinion gear is engaged with
ring gear, but does not rotate
Loose battery/starter terminal Tighten
Poor contact of starting switch Correct with sandpaper or replace
Worn brush Replace
Open circuit of starter coil Replace
Slippage of starter/clutch Replace
Excessive resistance of cable
between battery and starter
Increase the cable size or shorten
Insufficient battery charge Charge
No fuel injection Incomplete priming of fuel system Carry out sufficient priming
Clogged fuel inlet filter Replace
Fuel level in fuel tank is low Add fuel
Closed cock of fuel tank Open cock
Clogged fuel pipe Clean
Failure of fuel supply pump Repair or replace
Failure of fuel injector Faulty valve seat Replace
Sticking of nozzle Replace
Worn nozzle Replace
Clogged injection hole Replace
Failure in fuel injection system Loose fuel injection pipe joint Tighten
Broken fuel injection pipe Replace
Air trapped in fuel injection pipe Bleed air from pipe
Engine compressed air leak Air leak from exhaust valve Carry out fitting of valve and seat
Faulty gasket/packing Replace
Worn upper portion of cylinder Replace
Worn piston ring Replace
Sticking piston ring Overhaul or replace
Broken valve spring Replace
No revolution indication on
Tachometer during cranking.
Poor connection of crank & cam
position sensors.
Check connection of the wire harness
Other Failure of engine system Conduct servicing
Clogged intake or exhaust pipe Clean
Controller defects system error Check DTC and conduct servicing
3JH40_4JH45_4JH57_4JH80_4JH110_EN_OPM.book 137 ページ ２０２２年９月２２日 木曜日 午後６時１７分
To Next Page
Loading...
