Hi ,

I pressure at the back end SCV vhave a JD 6400 with hydraulic problems. The pressure at the back end SCV valves is measuring 2200 psi when it should be 2900 psi. The steering is also effected. When the engine is revved the steering improves but the back end pressure does not. The filter has been changed and pick up gauze / screen has been cleaned.

I am thinking that it is possibly the charge pump or the main hydraulic pump. Is there a way to test the charge pump pressure?

Any other ideas what the problem might be