Hydraulic fluid coming from breather tube

[greg_g]

You should use UTF in tractor that are engineered to use UTF. The owners manuals will specify the use of UTF. Jinmas were not manufactured to use UTF, the Jinma manuals do not specify the use of UTF. UTF may also contain additives that could be harmful to any yellow metals (brass/bronze/copper) used in construction.

UTF has a viscosity equivalency to 20 weight engine oil; too thin for your gear boxes and too thick for your hydraulics. In cold to moderate climates, Jinma gear boxes and differentials works best with 80W90 gear oil (~30 weight). In warmer climates, 85W140 is preferred (~50 weight). I switched to 85W140 after finding 80W90 too thin for heavy loads and long hours in the heat of July/August here. If you use UTF in a Florida Jinma, you'll find out real quick where all the leaks are.

Uncontaminated UTF residuals will ordinarily mix just fine with gear oil and hydraulic fluid. But if what's in there now is contaminated with water or dirt, by all means flush before putting in new fluids. Don't expend a whole lotta work on the foaming issue, until you actually have the right fluids in that tractor.

//greg//

 

[Dave_Lilly]

How long have you owned this tractor?

 

[gmurrill]

There are several things that will cause this and the fluid will not be one of them. First as one of the other guys stated before it is normally a loose fitting or a blown o-ring. Second look where your return line comes out of the hydraulic housing. The base that attaches to your hydraulic housing may have a crack, next clean and inspect the return line itself sometimes they will have or get a pinhole in it usually where the lines have been bent. Also if you have a tiny fraction of blowby on your loader cylinders, steering cylinder, diverter valve or steering box this can also cause this to happen. If you still need help call me tomorrow @ 225-279-1596 between 9:00 and noon and I will be glad to help you out