OPERATION TROUBLES AND ACTIONS When the cutting edge of the bucket is lowered to the ground surface, the depth display does not become 0.0 m (0.0 in). The depth display changes according to the position of the bucket. The boom stops before the point set for the depth mode. (This happens particularly when the boom is lowered slowly.) In cold weather, the stop position changes when the inter- ference prevention device and automatic control device are actuated. (This returns to normal when the hydraulic oil is warmed up.) 3-97