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Case Tractors Discussion Forum
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Case 530 Swing Cylinder Malfunction

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Ed's 530

03-19-2007 09:23:22




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I recently rebuilt both swing cylinder on my 530. Everything was going well until yesterday when the boom started to fade to the left. It also would not go all the way to the right, it stopped short by about 30�s. I shut it down and when I restarted it an hour later it was fading to the right very slightly and then finally settled in the center. With the boom all the way up and the dipper in, I was able to very easily push the hoe through out its range of swing.

Since it worked for several hours on previous occasions since the rebuild I can"t imagine it is a bad or improper cylinder packing.

The hoe is a model 42 with swing cylinders that protrude out the back(the old style).

Any ideas what I can look at to fix this problem are greatly appreciated.

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Roger (Mi)

03-20-2007 05:34:32




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 Look at swing cylinders again in reply to Ed's 530, 03-19-2007 09:23:22  
Since the swing cylinders were the last items being worked over, better check there first. Damaged seal during assembly? Loose piston rod nut? There are criss-cross reliefs on the swing cylinders that allow oil to transfer from one side of the hydraulic cylinders to the other. Because the boom is so heavy (especially loaded with dirt), those reliefs open on sudden hydraulic stops to prevent system damage. Unless there is some foreign matter preventing those reliefs from operating properly, your problem will likely be found in the cylinders.

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Ed's 530

03-21-2007 09:20:48




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 Re: Look at swing cylinders again in reply to Roger (Mi), 03-20-2007 05:34:32  
I found the problem. The stud at the end of the rod cracked just where the threads start. Do you think this is from the nut being too tight? When I rebuild how tight should the nut be? Thanks



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Roger (Mi)

03-24-2007 05:21:02




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 Hydraulic cylinder piston rod stud torque in reply to Ed's 530, 03-21-2007 09:20:48  
There are charts available listing the proper amount of torque a nut or stud should have given its size and hardness. Example: 5/8 stud with grade 8 hardness should have 200 to 240 foot pounds of torque.



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