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Fixed... Offer still stands if anyone needs the JD790 service manual. Thanks for the help! -Adrian

Quick update, pulled the rockshaft cylinder head off, and out fell this plug 🤣. I'd bet dollars to donuts this is the "SCV plug" that sits in the bottom of that hole to prevent oil from skipping the loader. The threads were even staked, but it still backed out. So back in with red loctite and...

Thank you for your help. If anyone wants the manual for this tractor I'll gladly share it. I'm currently pulling the rockshaft cylinder head off. The manual mentions something about either the relief bypassing, or the "SCV plug" bypassing if there's no pressure at the loader connections. Bad...

The manual I have (almost more confusing than helpful) shows the pressure line connecting on the rearward side above the T port, it calls the line going from the front side of the valve and back into the front of the rockshaft as a return...

The loader will only function if the 3ph is trying to raise. If I hold back on the loader, nothing happens unril I move the 3ph handle, the the loader will rise until I let go of the loader control, and then the 3ph comes up to wherever I left it's handle. It's like the system relief isn't...

Pump to rockshaft Rockshaft to loader front Rockshaft to loader rear To loader quick connects And there's another one coming off the rear of the loader valve under the inlet going to the trans housing

I got it at a reduced price because of the problem, so it's been like this. There are 7 hoses. The line from the pump goes to the rockshaft housing, and there are two going from the rockshaft housing to the loader valve

From what I could tell from the parts diagram the lines look right, they're all steel until the quick-connects... -Adrian

Hello everyone, I recently acquired a JD 790 with a 300 loader on it. It runs great, tires aren't bad, but there is one glaring issue: The loader only moves when the 3PH is being raised. I've checked both relief valves on the rockshaft cover and now I'm out of ideas... Any help would be...