Posted by jfharper on July 27, 2012 at 18:26:24 from (173.255.107.30):
Got a mf205 industrial and I think I'm getting air in my power steering system. Here's what happens:
1. Fill and Bleed - fill the pump while tractor is on, turning wheel back and forth, until practically no air bubbles appear. I do this using a hose attached to a funnel attached to the pump, that way I can see air come up into funnel as I work the wheel. Also, I have the front end off the ground for ease.
2. Test Drive - So I get the system bled, then test drive the tractor for 5-10 minutes turning the wheel back and forth, then as it idles for a couple minutes about a pint of fluid comes out the top of the steering column and I hear a good amount of air escape from within the steering column. So my guess is I'm getting air into the system that builds up to a point where the column seal can't take it.
I've replaced the pump and the column seal, I see no leaks at the cylinders or anywhere else. My steering shaft isn't in the greatest shape, and I don't know the integrity of the valve. If air was coming in the cylinders, wouldn't there be a leak or something indicating so?
After I bleed, the PS works great, can turn back and forth with a finger until I loose the fluid. Fluid is M-1110 equivalent.
Can anyone offer something I should try, should I rebuild my cylinders, or replace the steering shaft eventhough fluid doesn't leak until I get a gas bubble built up, or should I replace the vavle, or the o-ring at the base of the column, or ?
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