A depth control system for a frame mounted to a movement system is provided. The frame is mounted such that the frame can be raised and lowered in relation to the movement system by a height adjustment mechanism. The depth control system includes a depth control arm connected to the movement system, a height adjustment mechanism, and a mechanical stop. The height adjustment mechanism is configured to engage with the depth control arm to adjust the height of the frame. The mechanical stop is configured to engage with the depth control arm to prevent the frame from moving in at least one direction with respect to the movement system and disengage from the depth control arm when the height of the frame is being adjusted.