When Output Is Insufficient; When Engine Suddenly Stops; When Color Of Exhaust Smoke Is Black And Excessive - Kubota SQ-1120 Operator's Manual

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