Posted by NCWayne on January 13, 2015 at 19:20:36 from (173.188.169.54):
In Reply to: Hydraulic oil smells posted by Geo-TH,In on January 13, 2015 at 10:48:43:
Based on what your saying, I've got to agree that it definitely sounds like the oil is overheating. That said, what oil are you running in it, as the parts manual is calling for a 15w40 engine oil for outside temps above 40 degrees. Running the wrong weight of an oil can cause problems so I'd check that. The typical temp you'll want to see on a hydraulic system is below 210, but the very maximum you'll want to see is 250 degrees. Once you get that hot, your burning and breaking down the oil, so the cooler the better.
Looking at the manual ((the link below)) it recommends changing the oil every 250 hours, or every month and a half, if using it 8 hours a day. Like I said, I've seen hydraulic systems with thousands of hours on them, with no problems, so this quick of an oil change schedule on a system tells me that there is something not right, and they are trying to compensate for it by changing the oil -vs- fixing the problem.
That said, in my opinion, your best bet would be to install a small hydraulic cooler in the return line, and drive the cooling air with an 12v DC fan. Ditchwitch uses this design on many of their smaller pieces of equipment, like cable plows, that have a small hydraulic system, but use a lot of flow to both drive the machine as well as operate the various functions. If you could find the cooler off of a 255 cable plow, or something similar, and get it tied in, I think you'd see a world of difference. Good luck.
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