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Reply to "hot hydraulic oil in excavator"

As given above, I'd agree that oil analysis is needed to check oil condition - typically viscosity, oxidation and TAN will give an indication to how much thickening the oil has suffered. At 4200hrs - this is about 6 months or so on oil - again the oil analysis may indicate if the oil is being over extended.

Also check what oil is being used and if this is the right one to use.
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