Steering valve hissing in cab

[Flat 10]

Driving me mental. Other tractors of the same make aren’t as bad that I own. Is it likely to help if I change the transmission oil and filter?

 

[forblue]

? make and model.

 

[Phil P]

Is it a Deere, dose it go away for a few seconds if you tap the brakes?

 

[Flat 10]

Is it a Deere, dose it go away for a few seconds if you tap the brakes?

It is. Haven’t tried that. 20 series. Thanks will try next time I’m in it.

 

[Lewis821]

Had this years back on a 6920s, had a sticking valve iirc

 

[Flat 10]

Had this years back on a 6920s, had a sticking valve iirc

This is what I have

 

[Dog&stick]

Watching this with , great interest as also have this issue.

 

[AndrewB]

I had this on my 05 6920, it a sprung valve on top of the back end behind the cab, a few years ago now and don’t have the tractor now to take a pic.

 

[Flat 10]

Is it a Deere, dose it go away for a few seconds if you tap the brakes?

Louder when press on brakes. It’s a bit intermittent though but I can’t find anything that stops or starts it, except goes quiet when you are moving wheel.

 

[Phil P]

Louder when press on brakes. It’s a bit intermittent though but I can’t find anything that stops or starts it, except goes quiet when you are moving wheel.

Needs pressure testing really to make sure nothing is stuck, however you could try swapping the priority valve from one of your other tractors and see if it moves the fault. It’s the valve right on top of the back end, it’s under a T piece that has a rubber hose coming out the top and a metal pipe that goes to the trailer brake valve.
Just remember cleanliness is next to godliness when it come to hydraulic valves! Take note of which way up it came out also, you don’t need to swap the spring that’s under it but some valves do have a shim sits inside the bottom half Between the valve and the spring. The shim is usually still inside the valve when you pull it out though.

 

[Flat 10]

Needs pressure testing really to make sure nothing is stuck, however you could try swapping the priority valve from one of your other tractors and see if it moves the fault. It’s the valve right on top of the back end, it’s under a T piece that has a rubber hose coming out the top and a metal pipe that goes to the trailer brake valve.
Just remember cleanliness is next to godliness when it come to hydraulic valves! Take note of which way up it came out also, you don’t need to swap the spring that’s under it but some valves do have a shim sits inside the bottom half Between the valve and the spring. The shim is usually still inside the valve when you pull it out though.

Only other slightly odd things about this tractor are that the hydraulics pulse slightly (not as big as a judder) when weight is on and it sounds like it’s in 4wd on the road when it definitely isn’t. Just in case any of these things are related.