Research on the effect of setting parameters for technical-operating indicators and reliability of machine-tractor units on the John Deere 8335r traktor base

Abstract

Modern trends in the compiling of machine-tractor units in Ukrainian farms are focused on increasing the share of tractors used by world-known firms. In particular, the Ukrainian market is widely represented by John Deere tractors. Compiling of machine-tractor units, with such tractors, when performing a wide range of technological operations in crop production, has its own special aspects. These aspects, in the first place, lies in the appropriate algorithm of the tractor's operational settings for work with the specific type and model of the agricultural machine. In recent years, increased attention of tractor equipment manufacturers has been paid to universal wheeled tractors with full drive, high traction power, classical 4K4a arrangement where front wheels has smaller size than the rear ones, which include John Deere 8335R tractors. The development of this componentry scheme has led to increase in the role of the front driving axle by increasing the proportion of the bulk of the tractor that falls on it, to usage of enlarged-size tires on the front wheels to improve soil adhesion.The feature of compiling the aggregates with tractors of such componentry scheme is the possibility of ballasting the tractor.This means providing a wide range of changes in tractor bulk depending on the work being done and the tools used, which results the most efficient use of traction power and fuel economy.This approach makes it possible to significantly expand the range of tractors’ traction efforts, which is limited primarily by the reliability of powertrains of tractors.Therefore, manufacturers, without limiting the width of the capture of aggregates,demand rigid conditions for the high-speed motion mode of the unit.Without counting these features, it is not possible to achieve the acceptable technical and operational performance of the machine-tractor units and its operational reliability. The article substantiates and proposes the basic algorithm for adjusting the John Deere 8335R tractor machine on the basis of its equipment, in order to improve its main technical and operational performance and reduce the wear intensity of the front axle pneumatic tires. During the study of the influence of settings on the technical and operational parameters and the reliability of machine-tractor units for the research object was taken a serial tractor such as the John Deere 8335R tractor and the John Deere 3810 plow that carried out the plowing of soil in the field after corn harvesting on grain in the Dnipropetrovsk region. As a result of the research, the appearance of a kinematic inconsistency between the rear and front axle wheels was confirmed as a result of different distribution of soil bearing reactions under different ballast variants. Estimated coefficients of kinematic inconsistency were within kn = 1.026 ... 1.065, which was reflected in the deterioration of fuel efficiency to 18%.