S-5 Engine Does Not Rotate Smoothly - Komatsu WA250-6 Shop Manual

SEN03850-00

S-5 Engine does not rotate smoothly

General causes why engine does not rotate smoothly
Air in fuel system
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Defective speed sensor (Error at degree that it is not indicated)
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Confirm recent repair history
Degree of use of machine
Hunting
Replacement of filters has not been carried out according to Operation and Maintenance Manual
When fuel tank is inspected, it is found to be empty
Air breather hole of fuel tank cap is clogged
Rust and water are found when fuel tank is drained
Fuel is leaking from fuel piping
When priming pump is operated, it makes no reaction or it is heavy
When air is bled from fuel system, air comes out
Inspect fuel filter, strainer directly
When a cylinder is cut out for reduced cylinder mode operation, engine speed does not change
Carry out troubleshooting according to "Abnormality in Ne speed sensor (*1)" in display of code
Carry out troubleshooting according to "Abnormality in Bkup speed sensor (*2)" in display of code
*1: Failure code [CA689] in the display of code
*2: Failure code [CA778] in the display of code
12
40-600
Operated for long period
Occurs at a certain speed range
Occurs at low idle
Occurs even when speed is raised
Occurs on slopes
600 Troubleshooting of engine (S-mode)
S-5 Engine does not rotate smoothly
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Remedy
WA250, 250PZ-6
1
Causes
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