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Cat 226D dual auto self leveling

Hi how can I adjust the dual auto leveling in my machine? At the moment it only level when its raised about the middle heigh of the cab and when its lowered to its lowest position its in an up angle ant not parallel to.the ground, how do I adjust it to stay parallel all the way from the lowest point meaning the ground level and up to the highest point the end point of the parallel arms.
Thank you