Komatsu PC400LC-5 Operation & Maintenance Manual page 212

24.8.3 CLEAN ENGINE BREATHER
1.
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5.
Wipe away dust around the breather.
Loosen the clamp and remove the hose.
Clean the breather body with light oil or
Remove breather 0.
cleaning oil.
Replace O-ring with new one. Coat a new O-ring with engine oil,
set it, then install breather 0.
Check the breather hose. If caked oil (sludge) adheres to the
inside, replace the hose with a new one.
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