When the tractor www.ynzhongtian sowing operations, mostly two kinds of matching situations: First, traction planter. ABQ as an 8-type seeders; two are synchronized transmission ZBG a drilling machine 6A type of rice and wheat. Planting operations occur mainly due to yaw unit in the direction of sowing rate seeding head (or opener) mounting height of inconsistency or left-right asymmetry, peeling occurs coulter configuration and installation errors or broken off, traction frame collision crooked partial deformation and so on. Due to the above reasons. Bear resistance when planting operations in the direction of sowing rate ranging produce torsional torque, resulting yaw unit. To this end, the job should be carefully examined before planting planter technology status, configuration and installation of the required coulter peeling, seeding head (or opener) should be symmetrical configuration. Ensure consistency and compliance with agronomic mounting height requirements.