Dozer controls and setup CAT D6T 

so im on a d6t today with trimble the ground is on grade and as soon as you press auto the blade just starts bouncing up and down side to side out of control ? never used trimble on a cat before only on a komatsu any ideas cos cant seem to get any answers at work - basically im grading up the best i can using the light bars really could do with auto but it seems to have a mind of its own when engaged

Hi just wondering do you have to de Accelerate when you change from forwards to backwards when working the machine thanks

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