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1967 Case 580 CK loose backhoe assembly


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Preface: I have a comprehensive set of manuals.

I got this machine not long ago. Upon first use it was apparent that the entire backhoe assembly is really loose. If you put downpressure on the bucket, the entire control tower and everything comes back towards the operator. At first I thought it was the two vertical tension rods. I kept digging. I removed a rear wheel yesterday and noticed a large bolt going into some sort of frame. My wife observed the frame and bolt move as I pushed and released downpressure. I notice some odd looking welding that has cracked and also the bolt head has been welded in place. On the other side is a nut. I believe this is a rod that goes from one side to the other on the machine. I'm going through my manual but I don't know the name of this part. All I can find are exploded views of the backhoe assembly itself. I'm guessing it's called the back hoe sub frame. All I can find online are images of the loader subframe. Can anyone point me in the right direction? I know where the majority of the problem is but I want to study up on it before I tear into it. I bought this machine for myself, not for money, but I do have a few small jobs that I could take. I don't want to beat the heck out of it anymore. I know I'll be doing some welding and machining to get it right but that's just another day to me. It's not the part where the big pins go in. It's more towards the front. If you want to take the bolt out it sure looks like you'll be taking at least one wheel off. Looks to me you may as well take both off to get proper access to where it goes through. I hope these pics will help. It's tight in there with the rear wheels on.1006201837.thumb.jpg.505ef36b9e498e61c5938ae7f4aa03dd.jpg1006201837a.thumb.jpg.aacfa6d97a8e4e2073c1fdba18c76393.jpg

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You might have lots of boss/bushing wear there??

Case make very informative manuals for their Backhoe-Loaders.

I wonder if you need the manual dedicated to the Backhoe section itself. There were 25 & 35 series Backhoe attachments ,plus others.

I know there were dedicated manuals for them.

Talk to a specialist wrecker or supplier.They would know the issuue on this very common machine.

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Let me see if i can get my hands on my manuals , I have same machine . Be a day or three

Should be model 33 backhoe

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I have some through bolts in the dozer mainframe that attach the hard nose to the back, as big as they are there has been some prior welding on the nuts, sounds like a similar issue but those parts don’t have movement like a boom and hoe, might be accumulated wear at a few points

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42 minutes ago, hardtail said:

I have some through bolts in the dozer mainframe that attach the hard nose to the back, as big as they are there has been some prior welding on the nuts, sounds like a similar issue but those parts don’t have movement like a boom and hoe, might be accumulated wear at a few points

I'm sure the rest of it is pretty beaten up all along the line. This is the worst place though so if I fix it, ought to take care of a lot of it.

 

1 hour ago, Kevingweq said:

Let me see if i can get my hands on my manuals , I have same machine . Be a day or three

Should be model 33 backhoe

I'd appreciate that!

2 hours ago, JimInOz said:

You might have lots of boss/bushing wear there??

Case make very informative manuals for their Backhoe-Loaders.

I wonder if you need the manual dedicated to the Backhoe section itself. There were 25 & 35 series Backhoe attachments ,plus others.

I know there were dedicated manuals for them.

Talk to a specialist wrecker or supplier.They would know the issuue on this very common machine.

I'm sure it's going to be badly wallered out right there. I have the tractor loader backhoe manual, can't even find an image of the subframe though.

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4 hours ago, mmi said:

cant see exact piece in relation ,if bolted on both ends then it needs weld repair to it self alone

nothing is welded to tractor as they are semi quick detach

 

https://www.mycnhistore.com/us/en/casece/na/light-equipment/loader-backhoes/backhoe/backhoe-for-580ck/complete-machine/cn/D8CD6496-EFBE-E111-9FCE-005056875BD6_00_COMPLETE_MACHINE

I'm not sure it's exact, but I think it's equivalent. It'd be #5 and #6 on the diagram. I can't find a picture like this anywhere in the manual but this is closer than I was yesterday. Thanks! I was thinking maybe it was welded on and the bolt was a failsafe but I still don't know. I think I might have to raise the cab to get it properly.

https://www.mycnhistore.com/us/en/casece/na/light-equipment/loader-backhoes/backhoe/backhoe-for-580ck/complete-machine/backhoe-mounting-parts-loader-sn-4200725-and-after/cn/C0B36E81-8FBF-E111-9FCE-005056875BD6

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I have 2  580ck's, both 68 models with #33 hoe's on them. The #35 hoe goes on the 580B model and has 2 boom cylinders instead of one, plus other minor diffs.

Mine also push back towards you when you pry down really hard but normal diggin they dont move. --- I know my machines were abused and not serviced during their life.

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21 hours ago, SONNY said:

I have 2  580ck's, both 68 models with #33 hoe's on them. The #35 hoe goes on the 580B model and has 2 boom cylinders instead of one, plus other minor diffs.

Mine also push back towards you when you pry down really hard but normal diggin they dont move. --- I know my machines were abused and not serviced during their life.

You ought to go over yours before they get to being like mine.

I just want to know if those support arms are supposed to be welded on. I don't think they are but they look like nice welds. I was thinking it could be factory with the bolts as a failsafe.

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