Air in hydraulics?

[Pelican]

Ford NAA. Hyd started working slowly. Checked fluid and it was milky. Found that the fiber gasket on the filler cap was cracked in two places so water intruded. Drained. Added 2 quart of fluid and ran it to flush. Drained with it running to clear pump. Filled with fresh fluid and now it barely lifts. Will not pick bushhog off ground. Fluid on dip stick is full of air bubbles. Is this my problem or is the pump going out? If it's the air how do I clear it? Thanks for any help, Pelican

 

[ZANE]

If it has the replacement round piston pump you can bleed the pump by removing the front plug in the head of the pump and start the tractor and run at idle till no air bubbles come out with the oil that will pump out.

If it's the vane pump original and it's working just keep running it and the air should eventually come out.

Zane

 

[Pelican]

Thanks. I believe it is the original pump. Will keep trying.

Pel

 

[Bill Rowles]

I would check to see if you have a small leak between the pump and the oil reservoir (on the suction line)where air is getting sucked in continually when the pump is running. Maybe a dab of grease applied around any suspect area would identify the problem or temporarily stop the air leaking in long enough to give you a clue on the location.

 

[souNdguy]

square pump?