Harvester

A harvester comprising:

• a harvesting unit that harvests a harvested crop from a field;
• and
• a conveyance device that conveys the harvested crop harvested by the harvesting unit,
• wherein the conveyance device includes a conveyor chain, a conveyor screw, or both;
• and
• the harvester further comprises:
• a speed obtaining unit that obtains rotational speed information, the rotational speed information being information indicating a rotational speed of the conveyor chain or the conveyor screw;
• and
• a clog determining unit that determines whether or not the conveyance device is clogged on the basis of the rotational speed information obtained by the speed obtaining unit.

A harvester comprising:

• an engine;
• a harvesting unit including a cutting device that cuts planted culm in a field and an auger that is driven by power from the engine and feeds the harvested culm laterally in a lateral width direction of a harvester body;
• a conveyance device that conveys the harvested culm to toward the rear of the harvester body;
• a threshing device that receives the harvested culm conveyed by the conveyance device and carries out a threshing process;
• a rotation speed detection sensor that detects a rotation speed of the auger;
• and
• an auger state determining unit that determines a drive abnormality in the auger on the basis of a detection signal from the rotation speed detection sensor.