Komatsu WA250-6 Shop Manual

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

Komatsu WA250-6 Specifications

General

Brand	Komatsu
Model	WA250-6
Category	Compact Loader
Language	English