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Case Tractors Discussion Forum
:

case 680 backhoe

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A.M.

08-19-2006 21:42:02




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I just purchase a late 60's Case 680 ck loader with a model 34 backhoe to clear my lot. The loader works fine, yet the backhoe doesnt operate at all just a little hydraulic fluid weeping out of the control valve where the control rods connects to the spools. I have been told it could be a relief valve or a regeneration check valve. Anyone have any ideas on this problem because I can't even lower the stabilizers to separate the backhoe from the tractor. Also does anyone know what other model backhoe will fit this loader. thanks Tony M.

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Roger (Mi)

08-20-2006 04:56:33




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 Re: O-ring in the loader control valve in reply to A.M., 08-19-2006 21:42:02  
There is an O-ring in the loader control valve in the "power beyond" fitting. When the loader works and the backhoe doesn't, the problem will likely be that O-ring. Remove the line that goes to the backhoe at the loader valve, remove the fitting going into the valve and inspect the O-ring on that fitting. More than likely, it's defective. Good luck.



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Tony M2

08-21-2006 14:58:54




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 Re: O-ring in the loader control valve in reply to Roger (Mi), 08-20-2006 04:56:33  
Thanks Roger. I removed that fitting and the o-ring was gone, making me wonder where it is now in the hydraulic system. I have the o-ring dimensions and will try to get it locally and post my results later. Thank you again for the info. Tony M.



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