Older 580CK Backhoe Hydraulics instruction??

My 69 Case 580 with a 33 backhoe went Crazy Ivan on me.... the right outrigger control became very hard to move and sticks badly even if the tractor is off.

In addition the gas motor is stalling unless I operate either the loader or hoe.... then it roars off. As soon as I stop using hydraulics the engine bogs badly and dies out. Seems to be under load like the sytem is stuck in a loaded mode. That outrigger control works when running but is not right as it is sticking and very hard to use.

The filter gauge went from good to bad as soon as this happened. Of course I am going to change the filter but I am guessing the clogging or restriction is in the system due to the outrigger control? What do you think... Does this sound like the hoe has to come off to work on the system? Thanks Ralph

Also.....mEl I checked to see if the lines were all connected as you suggested in my post on the Case forum several days ago and they are. The outrigger control feels stuck and a lot harder to move than the other side and it feels that way when the unit is off as well. Where is the working part of the control valve assembly I need to check? Does the 33 hoe need to come off or is it done with it in place? Ralph

That sounds like there is somthing stuck in that spool valve,mark the two pipes and remove them and the fittings from that section of the block,with a strong light look into the ports,you may see a piece of a seal or the like,if you can"t see anything remove the spool,under the valve there is a cap held on by two 1/4 capscrews,remove the cap,inside is the spring that returns the valve to the neutral position,disconnect the lever,if there is enough room under the spool valve to remove it take it out by pushing it down and out of the block,if there is not enough room remove the spring retaining bolt the spring and the two guides,you can now pull the spool up and out,but more than likely it is jammed,turn it around while you watch through the pipe holes you might see what is jamming it,if you can"t see anything you might have to impovise a puller,a piece of threaded rod flattened and drilled at one end to fit where the lever goes and a piece of pipe that will allow the spool through,pull the spool out,clean it and the block section it fits in with compressed air,pour hyd oil into the block and put the spool back and hope it should be free,you need that spool to be free so it is returning to the neutral position and not staying open causing drag on the engine.
AJ

Thanks AJ......that detail is exactly what I need to tackle this hydraulics issue. This will be my first attempt and although I am handy at some wrenching on older trucks and tractors I have zero experience with the hydraulic valve assembly. Plus this is my first old backhoe and want to not make a mess of things. Appreciate you taking the time to set me up.

I'm quite interested in what you find, be sure to post back and let us know...sl

You can look at the parts drawing of the hoe valve on the online parts catlogue for Case machines at the link below,its not an easy site to get around,when the first page opens click on North America English,another page opens click on Parts and Service on the top bar,a drop down menu appears,click on Parts catlogue at the bottom,another page opens,a large black square appears,on the top left click on Launch Parts Catlogue,another page opens,type 33 in the box and click on search and you are at your hoe.
AJ
Case Parts

Thank AJ! I am going to try and determine if it is the valve tomorrow or Sunday and this reference is excellent. The exploded parts drawing and description is a real plus for my first try at the hoe hydraulics repair. Plus the backhoe is in Michigan (no computer) while I am home in Illinois so I printed the info and will take it with me. Being able to see that exploded view is just what I needed to boost my confidence that this can methodically troubleshot. Appreciate the assistance. Ralph

Thank AJ! I am going to try and determine if it is the valve tomorrow or Sunday and this reference is excellent. The exploded parts drawing and description is a real plus for my first try at the hoe hydraulics repair. Plus the backhoe is in Michigan (no computer) while I am home in Illinois so I printed the info and will take it with me. Being able to see that exploded view is just what I needed to boost my confidence that this can methodically troubleshot. Appreciate the assistance. Ralph

I disconnected the backhoe from the tractor and spent some time cleaning years of grease and dirt from the control assembly. The sticking stabilzer control rod had a subtle bend in it mixed with crud which was forcing the plunger down at a distressed angle and jamming the mechanism. I was able to free up the valve and get it smooth again. Everything was cleaned and the rod was straightened, hoses replaced and seems to be working good. I guess the PO used it hard and was not thinking the crud hurt or left it to hide.....

I took the opportunity while the hoe was off to pull the two swing cylinders which leak under load. My local Case dealer will get the job of rebuilding these as 750 foot pounds of torque seems like more than my garage vise and me want.

Am I correct in thinking that I can put a bypass hydraulic hose with quick disconnects on the lines coming from the loader control valve back to the hoe so I can use the loader/tractor while the repair is being done. Seems like that supply and return should keep flowing.

Hey AJ, thanks for the help. Ralph