Hydro steering question.

Texasmark1 · Nov 4, 2019

Best I can tell hydro steering is a 2 port hydraulic cylinder with inlet/outlets on each end. I assume that that fluid just shuttles back and forth and never gets replenished. If air or moisture invades the lines it could make for malfunctioning of the steering.

Does it make sense to crack the hyd lines on both ends of the cylinder and vent it periodically? Anybody had a reason to do that and curious as to the results.

Tx Jim · Nov 4, 2019

Not all hydro static power steering system utilize 2 way cylinders. Some utilize 2 one way cylinders. I see no advantage to loosening lines on either style steering to let any moisture escape. Hyd oil will need to be changed to remove moisture.

Texasmark1 · Nov 4, 2019

Wow that was quick. On your point, since there is a separate steering hyd. pump on my hydro steered tractors, I doubt the steering fluid would get
flushed out without breaking the lines even if the sump is changed. Comment?

Adirondack case guy · Nov 4, 2019

Those systems have a tendency to creep a bit. Air will purge it'self out. Try holding your steering wheel against relief each way and you will find the wheel continues to turn just a bit. Air also rises to highest point in the system.. -----------Loren

Steve@Advance · Nov 4, 2019

I wouldn't bother trying to flush it unless something happened, like a mechanical failure that put filings in the system, (but that would take more than just flushing) or it was submerged, large amount of water or wrong oil was used.

There is always some turnover of oil, especially if it is a single ended cylinder. The displacement of the rod causes the cylinder to need more oil to extend than to retract, so it's not always the same in, same out.

Air will find it's way up and out the reservoir.

paul · Nov 4, 2019

On the many different machines I?ve run over the years, I?ve never known air to be a problem trapped in the steering system. It finds its way out.

Paul

Texasmark1 · Nov 4, 2019

I did just as you said a few days ago and it did move a bit more in each direction. I assumed that the pressure relief valve was letting that "apparent" trapped air out becausing cycling through the limits a couple more times didn't result in any additional movement. The owner's manual states that prolonged rotation against the stop can overheat the hyd fluid. I understand that and that isn't what you suggested, nor what I did.

Texasmark1 · Nov 4, 2019

Ok guys. Appreciate the comments. Hopefully others will benefit from the information posted here as most any newish tractor has hydro steering. (assumption)....my 2007 and 2016 both do.

Hydro steering question.

Texasmark1

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Tx Jim

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Texasmark1

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Adirondack case guy

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Steve@Advance

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paul

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Texasmark1

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Texasmark1

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