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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

milky hydraulic fluid

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case5801979

01-29-2005 09:05:22




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this is a re post, i am still trying ti work this one out!
the hydraulic fluid (in my 1979 case580 ck Transmission) goes a creamy color after just a few hours of use.
i have drained the fluid using both drain plugs under the transmission and re filled with 32 weight fluid and i have also tried 46 weight.
there is no loss of coolant from the radiant
could the fluid be breaking down from heat?
i thought it may be rain getting in somewhere but it happened again this week and no rain
is it possible that i am not draining all of the fluid out?
is there some simple explaination?

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John Newman

02-16-2005 02:38:20




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 Re: milky hydraulic fluid in reply to case5801979, 01-29-2005 09:05:22  
Does the milky colour go away after the machine has been parked for a long period? If so, check for airation of the oil. Take a sample and leave standing in a clear glass jar. If over a period, the cloudiness clears from the bottom, it indicates air in the oil. If so, check your hydraulic pump's intake for poor joints, bad seals, hard / damaged flexible hoses or restriction. Listen to the pump - does it run smoothly or sound if it is pumping marbles!! If it is noisy, air could be being sucked in or it is cavitating which is the formation and collapsing of tiny air bubbles in the oil as the pump operates.

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GLewis

01-31-2005 04:48:24




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 Re: milky hydraulic fluid in reply to case5801979, 01-29-2005 09:05:22  
Have seen this many times before. Case uses the bottom of the radiator as an oil cooler just like the trans oil coolers on many cars. I suspect you have radiator coolant leaking into your hydraulic system via the cooler. Pull the radiator and put a pressure test on the cooler tank. That should tell you if that is the problem. Water will give your converter and reverser fits if you do not get it out of there.

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Chris Brown

01-30-2005 06:16:26




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 Re: milky hydraulic fluid in reply to case5801979, 01-29-2005 09:05:22  
I have a 560 IH loader tractor that I fought for years getting water in the hyd fluid. It is sitting out right now ,wont do nothing because of ice crystals in the hydraulic filter. I have changed the fluid several times and theres no good way to get ity all out of the cylinders,getting it all out of the tractor is no problem,open it all up and flush it out with diesel and a pump up sprayer. I keep it in a dry barn and it still gets milky. I give up.

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chvet73

01-29-2005 11:40:28




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 Re: milky hydraulic fluid in reply to case5801979, 01-29-2005 09:05:22  
I have a Bobcat that I bought after it was in a flood. One new engine later I'm still dealing with water in the hydraulics. After a few drain and refills I added a filter I found at my loacl hydraulics shop. It's called an 'AquaZorb'. It came with a base and is a spin on setup. I cut a return line and put it in. Seems to be finally doing the job. You will not get it all out until you circulate all the oil out of every line.

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case poor i n pa

01-29-2005 11:20:34




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 Re: milky hydraulic fluid in reply to case5801979, 01-29-2005 09:05:22  
dont know if this will do you any good.. but if i put reguler hydralic oil in my 730 trans it gets crappy to..i had to put in the case hytrans fluid ..cleared it up... hytrans was bout 36.00 a 5 gallon pail awhile ago.



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Charlie

01-29-2005 10:06:07




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 Re: milky hydraulic fluid in reply to case5801979, 01-29-2005 09:05:22  
I"m sure it"s contamination, almost certainly water. When draining the system, you need to try to get all the cylinders to drain also. For example, shut of the machine with bucket and boom up and whatever it takes so that gravity can then drain the cyliners by operating the valve afterwards. Manually swing the boom too. At this point, you could drain again, let the stuff settle and separate, and put back the clean fraction. which should still be good, after a week or so. There are other strategies too, like diverting the return line until all cylinders are flushed.

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