An agricultural vehicle includes a coupling structure for making a tool-lessattachment between afirst connector piece and a second connector piece. The first connector piecehas at least one pin,and the second connector piece has at least one slot adapted to receive thepin in a receivingpocket that is circumferentially spaced from an axially-open inlet portion ofthe slot. The slotincludes an inlet ramp between the slot inlet portion and the receivingpocket, and the inlet rampis less steeply angled than a second ramp surface that forms a portion of thereceiving pocketadjacent the first ramp.
