Komatsu Galeo PC138US-8 Shop Manual page 756

SEN02469-01 40 Troubleshooting
<Example of troubleshooting> Exhaust gas is black
Let us assume that a trouble of "Exhaust gas is black" occurred and we checked the [Questions] and [Check
items] and found the following 3 items to be the causal symptoms; [Exhaust gas slowly became black],
[Power slowly became weaker], and [Dust indicator is lighting red].
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PC138US, USLC-8