You would need to get a repair or seal kit for each of your Breakaway couplers. Both ISO and JD style kits are available. In order to remove the couplers you need to remove the little lever first. You need to take out the plugs on top by turning a self tapping screw into it just far enough so that it will grab. Pull the caps out with a pair of pliers. There should be new caps in the kits. Then remove the snap ring and spring and drive the lever out to the bottom. Now you can take the coupler out of the housing towords the back. Some couplers have a coil ring inside the housing towards the back which needs to be removed before you can pull out the coupler. Be careful not loose the little balls when pulling out the coupler. Once you got it on the bench you can remove the collar and balls. Some models have a ball inside the coupler which might rust and start to leak. Replace it. You need to push down on the opposite side of the coupler and remove the little snap ring. Very tricky. Using a drill press to push can help. Replace all O-rings you can find. Put everything back together.

The reason that your lever pops out is that the little spring underneath the caps is weak or broken. Maybe too much dirt in there. I would replace them as well. They might not be in the kit and neither is the ball. If you have O-rings and a packing in the coupler housing, I would replace them with the new style quad ring. Same goes for the inside of the coupler.

I hope I got everything. Someone will holler if I missed something, I'm sure.

If your couplers are leaking without any hoses plugged in, then I suspect that seals need to be replaced in the brekaway coupler as well as one or more valves in the SCV itself. There should not be any oil pressure on the couplers without moving the levers in the cab.

Parts can easily be found on the JD website.