Troubleshooting - Kubota Z482-E Operator's Manual

22 TROUBLESHOOTING
TROUBLESHOOTING
If the engine does not function properly, use the following chart to identify and correct the cause.
• When it is difficult to start the engine • When output is insufficient
Cause Countermeasures Cause Countermeasures
*Check the fuel tank and fuel filter. *Clean orifice and needle valve, being
*Remove water, dirt and other Impurities. Carbon stuck very careful not to damage the nozzle
Fuel is thick and *As all fuel will be filtered by the filter, if around orifice of orifice.
doesn't now. there should be water or other foreign nozzle piece "Check nozzle to see if good. If not
matters on the filter, clean the filter with replace with new parts.
kerosene.
*If air Is in the fuel filter or injection lines,
the fuel pump will not work properly. To
attain proper fuel Injection pressure,
Compression is
*Bad valve and excessive wear of rings.
insufficient.
pistons and liners cause insufficient
Leaking valves
compression. Replace with new parts.
*Grind valves.
Air or water mixed check carefully for loosened fuel line
in fuel system coupling, loose cap nut, etc.
Fuel is insufficient. "Check fuel system.
*loosen air vent screws stop fuel filter
and fuel injection pump to eliminate all
the air in the fuel system.
*Check lubricating oil system.
"Check to see if lubricating oil filter is
working properly.
*This is caused when water or dirt is
mixed In the fuel. Clean the nozzle
Thick carbon injection piece, being careful not to
deposits on orifice damage the orifice.
of injection nozzle. *Check to see if nozzle is working
properly or nol If not. install a new
nozzle.
*Filter element deposited with impurities
Overheating of
would cause poor lubrication. Change
element.
moving parts
*Check the clearance of bearing are
within factory specs.
*Check injection timing.
*Adjust timing 0.366 rad(20°) before top
dead center.
Valve clearance Is
•Adjust valve clearance to 0. 145-
0.185mm(0.0057-0.0072in) when the
wrong.
engine is cold.
Valve clearance is
"Adjust to proper valve clearance of
wrong.
0.145 to 0.185 mm(0.0057 to 0.0072 in.)
with engine cold.
Leaking valves "Grind valve.
Fuel injection timing
•Adjust injection timing
•The injection timing Is 0.366 rad(20")
is wrong.
before top dead center.
Air cleaner is dirty
*Clean the element every 100 hours of
operation.
Fuel injection •Adjust to proper pressure. 13. 7Mpa
pressure Is wrong. (140 kgf/cm'; 1991 psi)
Engine oll becomes
thick in cold *Change grade of oil according to the
weather and engine weather (temperature.)
cranks slow.
*Do not use poor quality fuel for It will
cause wear of the pump. Only use No.
Injection pump 2-D diesel fuel.
wear
*Check the fuel injection pump element
*Bad valve or excessive wear of rings,
and delivery valve assembly and
Low compression pistons and liners cause insufficient
replace as necessary.
compression. Replace with new parts.
Battery is "Charge battery.
discharged and the *In winter, always remove battery from
engine will not machine, charge fully and keep indoors.
crank. Install in machine at time of use.
NOTE:
• If the cause of trouble can not be found, contact your KUBOTA dealer.