Troubleshooting - Kubota D1503-M-E3 Operator's Manual

TROUBLESHOOTING

If the engine does not function properly, use the following chart to identify and correct the cause.
B When it is difficult to start the engine
Cause
* Check the fuel tank and fuel filter.
* Remove water, dirt and other
impurities.
Fuel is thick and
* As all fuel will be filtered by the filter, if
doesn't flow.
there should be water or other foreign
matters on the filter, clean the filter
with kerosene.
* If air is in the fuel filter or injection
lines, the fuel pump will not work
properly. To attain proper fuel
injection pressure, check carefully for
loosened fuel line coupling, loose cap
nut, etc.
* Loosen joint bolt stop fuel filter and air
Air or water mixed
vent screws of fuel injection pump to
in fuel system
eliminate all the air in the fuel system.
* Clean the nozzle injection piece,
being careful not to damage the
orifice.
* Check to see if nozzle is working
properly or not. If not, install a new
nozzle.
* Adjust valve clearance to 0.18 to 0.22
Valve clearance is
mm (0.007 to 0.0087 in.) when the
not as specified.
engine is cold.
Leaking valves * Grind valve.
Fuel injection timing
* Check injection timing.
is not as specified.
Engine oil becomes
thick in cold * Change grade of oil according to the
weather and engine weather (temperature.)
cranks slow.
* Defective valve or worn-out rings,
Low compression pistons and liners cause insufficient
compression. Replace with new parts.
* Charge battery.
Battery is
* In winter, always remove battery from
discharged and the
machine, charge fully and keep
engine will not
indoors. Install in machine at time of
crank.
use.
A If the cause of trouble can not be found, contact your KUBOTA dealer.
Countermeasures
TROUBLESHOOTING
B When output is insufficient
Cause
* Defective valve or worn-out rings,
Compression is
pistons and liners cause insufficient
insufficient.
compression. Replace with new parts.
Leaking valves
* Grind valves.
Fuel is insufficient. * Refueling.
* Check lubricating oil system.
* Check to see if lubricating oil filter is
working properly.
Overheating of * Change element.
moving parts * Check the clearance of bearing are
within factory specs.
* Check injection timing.
* Adjust timing.
* Adjust to proper valve clearance of
Valve clearance is
0.18 to 0.22 mm (0.007 to 0.0087 in.)
not as specified.
with engine cold.
* Clean the element every 100 hours of
Air cleaner is dirty
operation.
Fuel injection * Adjust to proper pressure. 13.7 Mpa
pressure is wrong. (140 kgf/cm ; 1991 psi)
Injection pump * Do not use poor quality fuel. (See
wear "FUEL" in "MAINTENANCE" section.)
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Countermeasures