420 Crawler Milky Hydraulic leAK

420C-Mike · Apr 27, 2015

Got my "new" 420 Crawler home and looking at all the future rebuilds and improvements. starts and runs well . All seems functional. Undercarriage is in much better shape than expected, before I tackle the many overhaul projects- I have one significant issue. I have a milky fluid leak coming from the underside of the hydraulic valve body mounted on top the hydraulic reservoir. Hydraulics work (lift and lower blade) , hydraulic fluid does not appear contaminated. Appreciate any help on my new toy !

Tx Jim · Apr 28, 2015

Milky hyd oil is normally caused by water contamination or possibly air from leak of inlet to pump

Dave H · Apr 28, 2015

If you got the time, you can catch some of that milk and let it set. It will separate and you can see if it was water or not. Foam from air of course will not separate out any water.

Tx Jim · Apr 28, 2015

One can perform a crackle test to determine if oil is contaminated with water by CAREFULLY dropping a drop or two oil on a hot skillet. If water is present the liquid will crackle/sizzle.

420 Crawler Milky Hydraulic leAK

420C-Mike

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Tx Jim

Well-known Member

Dave H

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Tx Jim

Well-known Member

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