ptsg
Super Member
With mechanical self leveling loaders, you'll need a relief valve in the curl/dump circuit. Usually a dual pressure relief valve, but Kubota seems to kinda cut corners and used a single relief valve.
The reason for the need of an relief valve tied into the curl/dump circuit is because, let's say you fully dumped the bucket lower to the ground. Once you start lifting the loader, the self leveling linkage will try to push the bucket ever further, which won't go because it already hit the stops. If there was no relief valve, something would break or bent. With the relief valve, it simply gives away by revealing the pressure.
Same principle applies if you're at max height, fully curled and try to lower the loader. Something has to give and that's where the relief valve comes into play.
I hope that makes sense.
The reason for the need of an relief valve tied into the curl/dump circuit is because, let's say you fully dumped the bucket lower to the ground. Once you start lifting the loader, the self leveling linkage will try to push the bucket ever further, which won't go because it already hit the stops. If there was no relief valve, something would break or bent. With the relief valve, it simply gives away by revealing the pressure.
Same principle applies if you're at max height, fully curled and try to lower the loader. Something has to give and that's where the relief valve comes into play.
I hope that makes sense.