Bf300a loader question

[501nmc]

Hello everyone, have a question about a loader not lifting or lowering under hydraulic power. Bucket works fine both curl and return as well as the 3 point lift. Boom cylinders don’t lift or power down to lift the tractor. My setup has three quick connects, one from the pump to the valve, one from the return side of the valve and one on the pipe that goes to the 3 point lift. Fel had been working with the exception of being able to lift the front tires off the ground using the boom function. I was trying to resolve this and now it won’t lift or lower at all but everything else works fine with decent pressure. After reading a few other threads about loaders, I’m thinking the quick connects that go to the return to tank may be bad but I’m not 100% sure. It is the original 2 spool kubota valve with the float function. The spool and the float function are intact and look fairly new, the check valves in the valve appear to be in good shape as well. I cannot find a hydraulic schematic on the unit to troubleshoot, only a component diagram. Any ideas?

 

[North Idaho Wolfman]

Swap the lines from lift to roll and see what it does.
If it doesn't lift it's a cylinder issue.
If it will lift then it's not a cylinder issue.
Then look at the other disconnects, But that's not likely because the three point works.