A coupling mechanism for coupling a crop conveyor unit 15, for creating a swath behind an agricultural machine, to a mounting structure 10 attached to an agricultural operating unit, e.g. a mower 21.. The coupling mechanism consists of tapered male 11 and female 12 elements such that the connection is self-guiding into the engaged configuration. A quick coupling method is described where the conveyor unit 15 is rolled on a trolley to locate the male element 11 underneath the female element 12. The mounting structure is raised such that the male element engages the female element and optional locking pins secure the engaged parts together before removal of the trolley. Quick de-coupling is performed by reversal of the coupling method.
