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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

1970 CK680 backhoe

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N.W.Co.Hittman

09-24-2005 13:29:19




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I just bought this tractor 5 months ago, the year of manufacture is a guess, I had a mechanic go through the machine, adj. valves, clean fuel lift pump on back side of injection pump, replace fuel lines and change fluids. He pulled off the arm, bucket curl and the left outrigger hydraulic cylinders. Well I brought the hoe home and used it for about four to five small projects and noticed the the arm cylinder was doing the same as before, it would bleed down when arm was lifted. The left outrigger cylinder is doing some bypassing, but I wanted to take care of arm cylinder first.
I removed arm cylinder and sent in in for warranty work, at the rebuild shop they came back and said the rod was bent. They said the machine needs line bored. I took the hoe to a local machine shop for line boring and the machinist said that no boring needs done and that all measurements are within specs and pins are tight. When the cylinder was first sent in for repair it had to be retubed. The old cylinder was totally gutted. My point here is the rebuild shop used the origional rod in the rebuilt tube. Now that every thing on the hoe checks out ok, how did the rod get bent? Is it the fault of the rebuid shop for using the old rod from the gutted out cylinder or is it from something on the hoe? I here these are somewhat indestructable. I'd appreciate any kind information to help me figure out what's at fault, so when I use this hoe again I don't end up with another bent rod to the arm cylinder. Sorry for such a long post, but it's a long story. Thanks; Larry

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Roy Suomi

09-24-2005 21:31:26




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 Re: 1970 CK680 backhoe in reply to N.W.Co.Hittman, 09-24-2005 13:29:19  
I don't think the rod is at fault. Is there a possibility that when unloading the machine from a trailer the backhoe bucket jammed into the ground?. I've also seen a trackhoe crowd cylinder bend from prying out stumps while traveling with the tracks. I don't know about indestructable , but they are a tough tractor.You might also check the circuit relief valve in the control valve for a possible locked up condition. It should relieve pressure that is over and above rated capacity..

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N.W.Co.Hittman

09-25-2005 15:02:54




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 Re: 1970 CK680 backhoe in reply to Roy Suomi, 09-24-2005 21:31:26  
That hasn't happened, but the cylinder would be at it's weakest point. I guess I will move on and learn from this. I am kind of with you that it's not the rod's fault. I will be careful and keep an eye on the machine to see anything changes in the future. Thanks Larry



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