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Polyurethane Primer Coatings Polyurethol tested in these solutions for 14 months. Coatings Polyurethol containing a hardener retained good adhesion to St3 steel. Coatings Polyurethol without hardener lost adhesion in solutions of potassium chloride, borofoska, diammofoska and nitrophoska. The effect of a borofoska solution on the electrical conductivity (from 1 nA) and resistance (up to 10 GΩ) of Polyurethol and Raptor coatings was studied using the IKS-1 measuring kit. Coatings were applied by spraying and brushing, in one and several coats, with and without hardener. The electrical resistance of a two-layer coating of Polyurethol was 130 MΩ, a single-layer coating was 17 MΩ after a year of atmospheric testing. The electrical resistance of the Raptor coating in three layers with a thickness of 300 microns decreased from 130 to 22 MΩ after 200 days of testing in a solution of borofoska. The insulating power of 1 coat of Polyurethol when applied by spray is equal to the insulating power of 2 coats of Raptor when applied by brush. It has been established that polyurethane coatings Polyurethol and Raptor are suitable for anticorrosion protection of low-carbon steels from the action of mineral fertilizer solutions. The insulating power of 1 coat of Polyurethol when applied by spray is equal to the insulating power of 2 coats of Raptor when applied by brush. It was established that polyurethane coatings Polyurethol and Raptor are suitable for anticorrosion protection of low-carbon steels from the action of mineral fertilizer solutions.

Tractor domestic generator G1000V was chosen as a mobile power source for heating viscous protective materials during conservation of agricultural machines. Generator drive from tractor PTO with the reverse rotation of the shaft to the left negatively affects the ventilation and cooling of its body, and leads to a decrease in power. Studies of the thermal mode of operation of the generator under a load of 620 W showed that during normal (right) rotation of the fan wheel, the generator housing heats up by 10 °C. The wheel casing heats up to 60 °C during reverse (left) rotation, and the power is reduced by 4%. P The cooling efficiency of the generator with radial blades is practically the same as cooling with forward inclined blades in reverse application. Changes in the configuration and parameters of the impeller with radial blades are made in reverse application to improve the cooling of the G1000V generator housing. Cutting the wheel ribs by 1/3 of the height and the protrusions on the periphery of the flange with the blades bent by 20° to the left made it possible to reduce the generator heating temperature by 13°C. The backward bending of the ends of the radial blades at an angle of 40-45° to the radius of the wheel contributed to a decrease in the temperature of the generator housing by 18°C. The parameters of the rational configuration of the fan wheel for the G1000V generator were obtained as a result of the research. The use of such a wheel provided a 2.8-fold reduction in the thermal load on the generator during reverse use on a mounted conservation unit.

The problem of choosing a telescopic propeller shaft in the design of an attachment drive with a lateral displacement of the power receiving shaft is considered. Dependences are obtained for determining the length of the propeller shaft and its working angle of deviation from the PTO axis of the tractor. These dependencies are tied to the parameters of the tractor hitch and aggregated attachments. A rational way to reduce the length of the propeller shaft to the desired size is proposed.

Influence of outflow of oil on its heating and decrease of useful capacity of the pump in hydraulic system of a tractor at work with the hydro motor is shown. The system of stabilization of temperature of hydraulic oil is necessary for steady work of the hydro motor.