Row unit for a seed-planting implement having a furrow depth adjustment system

A seed-planting implement, comprising:

• a toolbar;
• and
• a plurality of row units coupled to the toolbar, each row unit comprising:
• a frame;
• a disk opener rotatably coupled to the frame, the disk opener configured to form a furrow within a field across which the seed-planting implement is traveling;
• a gauge wheel arm pivotably coupled to the frame;
• a gauge wheel rotatably coupled to the gauge wheel arm, the gauge wheel configured to roll along a surface of the field;
• a wobble bracket configured to engage the gauge wheel arm;
• a linkage arm coupled to the wobble bracket;
• a pivot arm including a stem, the pivot arm being coupled to the linkage arm and pivotably coupled to the frame;
• an actuator configured to move the linkage arm relative to the frame in a manner that adjusts a position of the gauge wheel relative to the frame;
• a gearbox coupled to the actuator;
• a threaded shaft coupled to the gearbox;
• and
• an actuation arm including a first end and a second end opposed to the first end, the first end of the actuation arm defining a cavity receiving at least a portion of the stem such that the first end of the actuation arm directly engages the stem, the second end of the actuation arm coupled to the threaded shaft such that the actuation arm transmits rotation of the threaded shaft into linear motion of the linkage arm.