I have a 763. Is there a manual that will explain how the aux control function. I have a broom. grapple bucket and snow plow. When using any of these the control button(top of the handle) on the right lever do not seem to have any consistent control of the accessories. The snow plow goes to the left and stays there, when I try to move it to the right it moves to the right but then goes right back to the left position.