Trailed plows.
Even though the mounted plows are more economical and more future-proof, they did not completely displace the trailed plows. The possibilities of using larger mounted plows are limited by the weight of these plows. Attaching too large plows to the rear of the tractor causes so much relief from the front axle of the tractor, that the steered wheels of this axle lose contact with the ground under certain terrain conditions. This makes it difficult to control the tractor, and it often threatens to overturn the tractor. For this reason, plows with large working widths and heavy plows for deep and very deep plows are usually built as tractor-mounted frame plows.. The frame of each of these plows rests on three wheels. These are: furrow wheel, which runs in the furrow from the previous pass, a field wheel rolling in the field and a rear support wheel, also called thrust, rolling in the furrow behind the last plow body. The wheel axles are properly bent, thanks to which, by changing their position in relation to the frame, it is possible to raise or lower the frame with the plow bodies attached to it. The position of the wheels is changed manually by means of crank spindles, and in newer designs by means of hydraulic cylinders. There is a hitch in the front part of the plow. The hitch hook cooperates with a spring fuse, which in case of excessive resistance of the plow disconnects it from the hitch of the tractor.