Kubota SQ-1120, Руководство оператора, Страница: 56 / 63

41 TROUBLESHOOTING
B
When Output is Insufficient
B
When Engine Suddenly Stops
B
When Color of Exhaust Smoke is Black
and Excessive
Cause Countermeasures
Carbon stuck
around orifice of
nozzle piece
*Clean orifice and needle valve,
being very careful not to damage
the nozzle orifice.
*Check nozzle to see if good. If not,
replace with new parts.
Compression is
insufficient.
Leaking valves
*Bad valve and excessive wear of
rings, pistons and liners cause
insufficient compression. Replace
with new parts.
*Grind valves.
Fuel is
insufficient. *Check fuel system.
Overheating of
moving parts
*Check lubricating oil system.
*Check to see if lubricating oil filter is
working properly.
*Filter element deposited with
impurities would cause poor
lubrication. Change element.
*Check that bearing clearances are
within factory specs.
*Check injection timing.
Valve clearance
is wrong.
[Engine model : D1703-EBG,
V2203-EBG]
*Adjust valve clearance to 0.18 to
0.22 mm with the engine is cold.
[Engine model : V3300-EBG]
*Adjust valve clearance to 0.23 to
0.27 mm with the engine is cold.
Air cleaner is
dirty *Clean the element every 250 hours
of operation.
Fuel injection
pressure is
wrong. *Adjust to proper pressure.
13.7 Mpa (140 kgf/cm , 1991 psi)
Injection pump
wear
*Do not use poor quality fuel as it will
cause wear of the pump.
Only use No.2-D diesel fuel.
*Check the fuel injection pump
element and delivery valve assembly
and replace as necessary.
Cause Countermeasures
Lack of fuel
*Check the fuel tank and refill the
fuel, if necessary.
*Also check the fuel system for air or
leaks.
Bad nozzle
*If necessary, replace with a new
nozzle.
Moving parts
are overheated
due to shortage
of lubrication oil
or improper
lubrication.
*Check amount of engine oil with oil
level gauge.
*Check lubricating oil system.
*At every second oil change, oil filter
cartridge should be replaced.
*Check to see if the engine bearing
clearances are within factory specs.
Cause Countermeasures
Fuel governing
device bad *Contact dealer for repairs.
Fuel is of
extremely poor
quality. *Select good quality fuel.
Use No.2-D diesel fuel only.
Nozzle is bad.
*If necessary, replace with new
nozzle.
Combustion is
incomplete.
*Cause is poor atomization, improper
injection timing, etc.
Because of trouble in injection
system or in poor valve adjustment,
or compression
leakage, poor compression, etc.
Check for the cause.
Engine is
operating in
overload
condition. *Diagnose and eliminate reason for
overload.
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