A field study has been conducted during the Agricultural season (2013) in the governorate of Nineveh to study the operating conditions that surround the combined harvester driver during harvesting barley. These conditions; the degree of noise of and without an ear protector, different shifts three to five hours and different types of harvesters of conditioned environments type of the harvester john deer 2054 new-Holland Bizonz110 with unconditioned environments to the harvester john deer 80.The study aims at finding the best operating conditions and the less effective ones on surface side for harvester drivers and the effect of these conditions on the efficiency of production and the components of wastage in the harvest . The results showed that the Machinery indicators of the harvester john deer 2054 with noise and ear-protector and three-hour shift outperformed gave less value of Quantitative loss. Whereas, the non-ear protector harvester new-Holland and with five-hour shift showed higher productivity .Whereas the non-ear protector harvester new-Holland with noise and with five-hour shift showed higher efficiency of the harvester. The best results for the Health Indicators the non-ear protector harvester new-holland with noise and the three-hours shift showed outperformance in giving less absolute difference in the property of body temperature and blood sugar. In comparison, also the harvester john deer 2054 with noise and without using an ear-protector outperformed in giving higher absolute difference for pulse rate.