Posted by Owen Aaland on December 12, 2009 at 20:52:28 from (65.165.246.148):
In Reply to: I Need Help!! posted by Allan In NE on December 12, 2009 at 16:12:04:
Is that white line in the picture a steam of oil? If it is that will cause foaming.
If the tractor sits for a few hours to let the air separate from the oil, do you have hydraulics for a little bit and then lose them? That might indicate that the foaming is occurring somewhere other than the hydraulic pump area.
If there is air in the system immediately on start up that might point to an air leak at the filter/hydraulic pump area. Remember that the center section of the hydro is completely filled with oil in normal operation so a crack or leaking O-ring on the suction manifold will not be apparent once the housing is filled. Cold oil may be stiff enough to cause problems there that don't show up when the weather is warmer.
Another possibility would be a failure of the hydro charge pump. A failure there may allow the hydraulic pumps to suck air and if the high pressure loop of the hydro lacks charge pressure you sure aren't going to get any movement on the transmission input shaft.
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