Komatsu WA250-6 Shop Manual

SEN03850-00
40-600 20 WA250, 250PZ-6
600 Troubleshooting of engine (S-mode)
S-13 Oil level rises (Entry of coolant or fuel)
S-13 Oil level rises (Entry of coolant or fuel) 1
General causes why oil level rises
q Coolant in oil (milky)
q Fuel in oil (smells diluted diesel fuel)
a If oil is in coolant, carry out troubleshooting for “S-11 Oil is in coolant”
Causes
Broken cylinder head, head gasket Broken injector, O-ring Cracks inside cylinder block Holes caused by pitting Worn, damaged rear oil seal Broken oil cooler core, O-ring Defects in supply pump Defective seal of auxiliary equipment (pump, compressor)
Questions
Confirm recent repair history
Degree of use of machine Operated for long period EEE E
Fuel must be added more frequently ww
Coolant must be added more frequently QQ
There is oil in coolant QQQQ w
Oil smells of diesel fuel ww
Oil is milky QQ
When engine is started, drops of water come from muffler Q
Check items
When radiator cap is removed and engine is run at low idle, an abnormal number of bubbles appears,
or coolant spurts back
wQ
Exhaust smoke is white Q
Oil level in damper chamber is low w
Oil level in hydraulic tank of machine is low w
Troubleshooting
When compression pressure is measured, it is found to be low q
Remove injector and inspect O-ring. q
Inspect cylinder block directly qq
Inspect rear oil seal directly q
Pressure-tightness test of oil cooler shows there is leakage q
Remove and inspect supply pump directly q
Inspect seal of auxiliary equipment directly q
Remedy
Replace Replace Replace Replace
Correct
Replace Replace Replace

Komatsu WA250-6 Specifications

General

Brand	Komatsu
Model	WA250-6
Category	Compact Loader
Language	English