Case 580B 1974 - hoe boom keeps dropping

[elmartinfarm]

Hello. With the radiator replaced, on to the next problem.

The hoe boom will not stay in position. All of the other hydraulics are behaving.

The hoe boom has power, it just will not stay in position, just sinks until the hoe is resting on the ground. Figured before I tear into things I'd ask what are the most likely candidates and what to do about checking each one.

Still have 40-plus cedar stumps left in Aunties drive. Great stump digging weather too.

 

[SupplyPartsLLC]

Each circuit has an overload relief so if something drops on the boom it will go down instead of breaking. could be orings in the overload or some trash in it. Try backing it all the way off then power down, might blow the trash out first other wise either swap it with another one to see if the problem moves with it. Check your down pressure on power down, low pressure could be the over load.

 

[elmartinfarm]

68 Case 580K, I haven't noticed leaks around the tower. Photos of the tower controls.

 

[elmartinfarm]

 

[elmartinfarm]

I'm very much the noob on these machines. Can you walk me through what you're saying to try here. What does 'backing it all the way off" mean?

So if you look at the photo I posted, you're saying I could swap the boom lines with the dipper lines on the tower and see if the problem stay with the boom or goes to the dipper. I'll give that a shot.

 

[cycle_gator]

I have a 1968 580 ck with exactly the same issue. I have been using a "device" keep the boom cylinder retracted when using the front loader. Too much to do right now to play with it. it is definitely a PITA when digging as you have to hold constant pressure on the boom valve to keep it from going too deep. Once I finally get it fixed I wont't know how to run it anymore

It is one of three things

1. The boom cylinder is bypassing which would be bad as I just had it rebuilt less than 20 hours ago
2. The pressure relief is gummed up
3. The load check is gummed up.

I am also going to swap out the valve section to see if it is the valve or the cylinder.

Unlike your condition, my control valve leaks a quart per hour of operation.