[Jm790]

Hello everyone thanks for letting me be part off the group. I need help I have a problem with my 3 point on my jd 770. It won't go up or down. Everything was working perfect before I remove the loader Valve. I'll already try the speed nut.ajustment and nothing. Oh and I got a wining noise too. Everything else works fine on the tractor thanks.

 

[krugford]

When you say you removed the loader valve, what do you mean? Did you actually remove the selective control valve assembly for the loader hydraulics? If you removed the SCV and capped the hydraulic lines, you've dead headed the hydraulics and are running through the pressure relief, which would be a high pitched whine. I"m not familiar with the hydraulic schematics on your tractor, but the rockshaft (3 point hitch) is likely last in line for hydraulic flow. If you've removed and capped upstream hydraulic components, it's no longer hooked up, hydraulically.

 

[Jm790]

Thanks for responding. I figured out the problem this morning. I swap the scv. From the one that come without the loader control valves. And fix my issues. I call my John deere dealer to ask if I need it to do anything else. If I wanted to add a loader to a my tractor that didn't come with a controller valve and they say no or if the main scv was different and they told me that it was the same I just need it to add the loader csv. But I guess it's something different in between. Them two. I figured that when I when and mount the loader to the other tractor and there was not much pressure to lift the loader. So my last hope was swapping them. I couldn't find anything that could help me online. Sorry if this is too long hopefully this information helps any other person that runs into a similar problem.