Recently running my 304.5 mini excavator and within a 2 hour span my hydraulic oil changed from a transparent honey color to a dark grey/ black color. I recently purchased, so it may just be that it took that long for any newly added oil to mix with whatever old oil was already in the system but I have not been able to find anyone with any ideas as to what steps I should take next. Upon opening the hydraulic tank I did not witness any cream from water intrusion or bubbles. So at this time...
Hydraulic oil from honey color to almost black
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