S-10 Fuel Consumption Is Excessive - Komatsu WA250-6 Shop Manual

600 Troubleshooting of engine (S-mode)

S-10 Fuel consumption is excessive

S-10 Fuel consumption is excessive
General causes why fuel consumption is excessive
Leakage of fuel
q
Defective condition of fuel injection (fuel pressure, injection timing)
q
Excessive injection of fuel
q
Confirm recent repair history
Degree of use of machine
Condition of fuel
consumption
There is external leakage of fuel from engine
Combustion is irregular
Engine oil level rises and oil smells of diesel fuel
When exhaust manifold is touched immediately after starting engine, temperature of some
cylinders is low
Low idle speed is high
HST stall speed is high
Color of exhaust gas is
Remove head cover and inspect directly
Inspect fuel supply pump oil seal directly
Carry out troubleshooting according to "No-pressure feed by supply pump (*1)" in display of code
When a cylinder is cut out for reduced cylinder mode operation, engine speed does not change
Much fuel returns from the injector
Carry out troubleshooting according to "Abnormality in coolant temperature sensor (*2)" in display
of code
Confirm with monitoring function
*1: Failure codes [CA559] and [CA2249] in the display of code
*2: Failure codes [CA144] and [CA145] in the display of code
WA250, 250PZ-6
Operated for long period
More than for other machines of same model
Gradually increased
Suddenly increased
Black
White
SEN03850-00
Causes
E E
Q
Q
Q Q
w
w w
Q Q
Q
q
q
q
q
Remedy
40-600
1
E
Q Q Q
Q
w
w
Q
Q
Q Q
q
q
q
q
17