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 08-25-2009, 16:01 Post: 165259
SnaykeByte



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 air in steering

1st post, glad to be here. We have a 520 tractor that blew a return line on the power steering unit last year. We replaced the line and ever since then the steering gets all stupid and wobbly in anything above 7th gear on the road. We have a service manual, but it says nothing about bleeding the system. On looking at it closer, we noticed the lines going to the assist cylinder both go in the bottom so would that not allow an air pocket to enter when most of the oil left? There is no bleeder port on it anywhere that we have found, any help would be appreciated.......-Curtis.






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 08-25-2009, 20:11 Post: 165265
earthwrks

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If the system is anything like I'm used to, it sounds like a bad steering valve to me. When they start to go bad, they require a lot of input to keep them steady. Mainly what happens is the reaction or torque rod inside goes bad.
The service manual should have detailed diagnosis and testing procedures. If not you'll need to take it to a dealer or the very least a competent hydraulics shop that specializes in hydraulic steering valves like hi-los have.
10 years ago my mid-sized backhoe cost $700 to rebuild it.






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 08-25-2009, 20:15 Post: 165266
SnaykeByte



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Thank you for the reply and I would agree with you, but until we blew the return line it drove perfectly fine in ninth gear???






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 08-26-2009, 14:45 Post: 165290
SnaykeByte



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Nobody knows how to get it out?






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 08-26-2009, 16:29 Post: 165293
Murf

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Standard hydraulic bleeding of lines, same as fuel injectors or brakes.

Find the highest point in the circuit where there's a fitting and with pressure applied to one side bleed the return line, repeat until nothing but fluid comes out, no further air bubbles.

As a note though, even if there is air in the system, it will self-bleed during repeated cycling. With the engine at a fast idle steer it from fully turned one way, to fully turned the other way repeatedly. Air is less viscous than hydraulic fluid and will be displaced quite quickly by pressurized fluid. In some cases you need to take the weight off the front wheels in order to reduce the hydraulic back-pressure, but that's not the norm.


CAUTION: Live hydraulic lines can release enough pressure to seriously injure a person. Do the bleeding with extreme caution and be sure to wrap a thick rag or something around the fitting and wrench to contain the spray safely.

Best of luck.






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 08-27-2009, 09:59 Post: 165302
SnaykeByte



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That is EXACTLY my problem, there are NO fittings to bleed it at. The lines both go into the bottom of the cylinder. I am aware of how to bleed hydraulics, but there is no where to bleed it.






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 08-27-2009, 13:09 Post: 165310
Murf

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Quote:
Originally Posted by SnaykeByte | view 165302
That is EXACTLY my problem, there are NO fittings to bleed it at. The lines both go into the bottom of the cylinder.



Maybe I'm missing something, how can it have lines but no fittings?

You say you blew a line and replaced it, so there must be fittings at both ends of the lines.

Best of luck.






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 08-27-2009, 13:57 Post: 165312
SnaykeByte



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If I can figure out how to post a pic on this board I will. The two lines on the little hydraulic cylinder most certainly do have lines on it, but the lines are on the BOTTOM of the cylinder, ie, there are NO fittings that I can use to bleed the air out of this cylinder.






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 08-27-2009, 14:18 Post: 165313
Murf

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Quote:
Originally Posted by SnaykeByte | view 165302
I am aware of how to bleed hydraulics, but there is no where to bleed it.



Ah, got it now, sorry, I was mislead by your earlier comment.

Although it might work better higher up, like the other end of those lines, the lowest place in the system will still work just fine.

Air will always move before, and faster, than more viscous liquids like hydraulic fluid.

All you need to do is get enough of an opening in the system that the air gets forced out.

Best of luck.






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 08-27-2009, 15:04 Post: 165314
SnaykeByte



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Air won't do that in this shop. That's why bleeders in calipers and wheel cylinders are always in the top. You can have air in the high parts of a hydraulic brake system and unless you bleed it out it will be in there for the life of the vehicle, Air will NOT move down and flow out the bottom of this horizontally mounted cylinder unless we turn the tractor upside down.






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