Fuel Consumption Is Excessive - Komatsu 114E-3 Series Shop Manual

40 Troubleshooting
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
Torque converter stall speed or pump relief speed is high
Exhaust smoke color
Remove head cover and inspect inside directly
Inspect feed pump oil seal directly
Carry out troubleshooting according to "No-pressure feed by supply pump (*1)" in E-mode
When a cylinder is cut out for reduced cylinder mode operation, engine speed does not
change
If spill hose from injector is disconnected, much fuel spills
Carry out troubleshooting according to "Abnormality in coolant temperature sensor (*2)" in
E-mode
Confirm with INSITE or with monitoring function on applicable machine side
*1: Code [559/CA559] and code [2249/CA2249] in E-mode
*2: Code [144/CA144] and code [145/CA145] in E-mode
114E-3 Series
Operated for long period
More than for other machines of same model
Gradually increased
Suddenly increased
Black
White
SEN00458-01
Causes
E E
Q
Q
Q Q
w
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Q Q
Q
q
q
q
q
Remedy
1
E
Q Q
Q
w
w
Q
Q
Q
q
q
q
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