a torque limiting coupling for a driveline for driving agricultural implements has a coupling hub with first recesses which receive adjustable driving members . the coupling hub further includes second recesses which include a spring assembly . switching cams of the spring assembly load the associated driving member . a coupling sleeve is arranged around the coupling hub . covers laterally seal the unit and laterally guide the coupling hub . sealing rings are provided to render the unit oil - proof . oil at least partially fills the free space between the components . thus , the unit ensures in the case overloading occurs , the driving members , which engage a groove in the torque transmitting position , cannot return into the groove until a relatively low rotational speed has occurred . at high relative rotational speeds , the oil contained in the grooves during rotation prevents the driving members from re - entering the grooves .