New Holland 555E Rear Controls not working

[mmcfall35]

Morning,

I borrowed my Brother-in-laws backhoe this weekend and got in a soft area and buried one of the rear tires. I was using the rear bucket to get the backend out of the rut and suddenly the boom stopped responding to the controls. The FEL and outriggers still work, but the boom does not. I moved the tractor about 6-8 feet before it quit responding so the front tires have dropped into the rut and the front axle is touching the ground. I do not see any loose hoses. Any ideas or assistance will be very greatly appreciated. Thanks.

 

[J_J]

Check the pin that holds the lever on to the spool for the boom.

See if the boom spool can move in and out equally.

If everything looks OK, then shift one of the other spools hoses to the boom and see if there is any action.

If the piston nut came off the cyl piston, the boom would do nothing.

Check all the QD's if you have them.

 

[EddieWalker]

Is the linkage intact? if not that, then you might have a kinked or damages supply line that isn't allowing the hydraulic fluid to get to the area where the linkage controls the lines. If you look at the back of the backhoe, right under the control arms for the backhoe, you will see where all the hoses come out of the same spot. Crack a line and make sure you are getting fluid through those lines. If not, there is a hose from the pump that goes there that is probably damaged and not allowing fluid to get through it.

Eddie

 

[mmcfall35]

Guys,

Thank you for the replies. I am going to check both of these after church. Gonna do some extra praying while I am here too.

 

[J_J]

Is the linkage intact? if not that, then you might have a kinked or damages supply line that isn't allowing the hydraulic fluid to get to the area where the linkage controls the lines. If you look at the back of the backhoe, right under the control arms for the backhoe, you will see where all the hoses come out of the same spot. Crack a line and make sure you are getting fluid through those lines. If not, there is a hose from the pump that goes there that is probably damaged and not allowing fluid to get through it.

Eddie

He did not say if the BH had it's own pmp.

In an open center hyd system, there has to be flow at all times the engine is running or something will be damaged.

He has flow to his other BH functions.

No boom problem has to be either a bad cyl, bad spool, or QD not connected correctly.

He can switch spools and verify the cyl or the spool is bad.

Just reset all the QD's.

A hyd gage would help in this situation.

 

[Leejohn]

Kind of hard to switch hoses on a back hoe.

 

[J_J]

What do you mean, the hoses on my Case BH is right there in your face.

You switch hoses at the valve.

Just a picture, not mine.

http://www.usfarmer.com/fetch_file/?id=1339158

 

[Leejohn]

I think his are all hard lines at the valve.

 

[EddieWalker]

I have a 555E and it has one pump, which is right behind the engine. The hoses from it go to the loader control and the backhoe control, where the handles are. If the front end is working, then the pump is fine. If the back end isn't working, then I'm thinking the hose supplying the hydraulic fluid to that valve assembly is damaged, kinked, or bent in such a way as to not allow the fluid to get into the valve assembly, where all the hoses then lead to the cylinders in the backhoe.

It's not hard to crack a hose on a cylinder on the backhoe where it's easy to reach and see if fluid comes out under pressure.

Eddie

 

[J_J]

The BH is getting flow as the stabilizers are working.

A 3000 hyd gage will tell the story. Install the hyd gage in a tee in the IN port of the BH valve.

Max out each of the cyl. and you will see a weak cyl or one that is by passing.

Some cyl might have a relief valve across the cyl and could be stuck open, bleeding off the potential pressure.

To test the boom spool, put a gage on the cyl hose and momentary flip the lever. Good pressure = good spool. NO pressure or little pressure = bad spool.

Compare the other cyl, each one could be different.