This left-side drive eccentric transmits motion from the seed-drill metering mechanism to the feed system on the threshing unit. It is mounted on the left side of the assembly and rotates to produce the oscillating movement that drives the seed drill. A worn or bent eccentric causes irregular seed delivery, leading to uneven crop distribution behind the combine. The part is manufactured to match the original geometry so that the mounting holes align with the drive flange without modification. On reinstallation, ensure the eccentric is seated fully on the shaft and that all fasteners are tightened to the specified torque.