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Case Tractors Discussion Forum
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580 c Backhoe Hydraulic Questions

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Gregg Blair

07-24-2004 18:01:23




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I have a 580 c backhoe that seems to have some hydraulic problems. When I try to work two sticks or levers together, only one will operate. You cant work two levers at the same time. Its like there is not enough hyd. pressure to run both. I have checked the pressure and it is at 2000 psi. Is this normal? Also I have been told that when the engine is at idle speed and you try to raise the backhoe with the boom or bucket it should kill the engine or at least almost kill it. Well if this is true, I have another problem because there is no change in rpms when I try to lift the backhoe. Any one have any suggestions as to what the problem is?
Please dont hesitate to post them.
Thanks

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Dennis/Ohio

07-27-2004 18:44:44




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 Re: 580 c Backhoe Hydraulic Questions in reply to Gregg Blair, 07-24-2004 18:01:23  
Hi Gregg,
At an idle if you lift your tractor off the ground with the hoe. It will stall or nearly stall the engine. I think you misunderstood what they were saying. Best wishes, Dennis.....



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Max

07-25-2004 08:05:04




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 Re: 580 c Backhoe Hydraulic Questions in reply to Gregg Blair, 07-24-2004 18:01:23  
Compare the psi at 2000 rpm and 1200 rpm. The pressure should be within 500 psi of each other. If not, its possible the pump is starting to wear out, the hydraulic oil is breaking down, or the oring on the power beyond fitting is starting to leak. How does the loader work? Will the bucket dump circuit lift the tractor? If the loader has better pressure that those from above, its the power beyond oring. The power beyond oring is located on the elbow fitting coming out of loader control valve that continues on towards the backhoe.

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robert

07-24-2004 22:13:29




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 Re: 580 c Backhoe Hydraulic Questions in reply to Gregg Blair, 07-24-2004 18:01:23  
Sounds like it is ok to me. 2000 psi is good or pretty close.Depend on RPM. Your not suppose to pull two levers at one time think your talking to the wrong people.That is my thinking.The control valve is open center system if you pull two levers the frist in line will get the pressure.



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Dennis/Ohio

07-27-2004 18:32:35




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 Re: Re: 580 c Backhoe Hydraulic Questions in reply to robert, 07-24-2004 22:13:29  
Hi Robert,
I think the last spool in the the line will receive the most pressure at first. You have no pressure until the flow is restricted. The pressure would start at the last spool and work its way back. After the pressure has equalized on both spools you can share the volume between the spools. Thats what I think but I've been wrong before.
Best Wishes, Dennis.....



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Joe (Wa)

07-24-2004 23:19:49




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 Re: Re: 580 c Backhoe Hydraulic Questions in reply to robert, 07-24-2004 22:13:29  
The 2000 psi is good if the gpm is there. Do you have a view of the gauge during operational functions of the hoe?

I have no experience with the 580c but I've never operated a backhoe that didn't have simultaneous functions.

Perhaps you have a back pressure problem, plugged return filter?

Joe



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Gregg Blair

07-25-2004 08:23:27




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 Re: Re: Re: 580 c Backhoe Hydraulic Questions in reply to Joe (Wa), 07-24-2004 23:19:49  
Thanks guys for the suggestions I will see if the filter is plugged.



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