USER MANUAL Tractor semitrailers PTL 21 reverse until the hole of the hitch loop of the tractor coincides with the hole of the drawbar loopof the semi-trailer; insert a pin and fasten; raise the hitch loop of the tractor to the required height; pull up the hand-brake of the tractor; raise the support of the semi-trailer to the required height; connect the hydraulic and pneumatic systems of the semi-trailer with the respective systems ofthe tractor; connect the light signalling cable of the semi-trailer to the electricity system of the tractor; check the operation of the hydraulic cylinders of the semi-trailer and tightness of the system; check the operation of the brakes of the semi-trailer and tightness of the system; check the operation of the light signalling of the semi-trailer; before driving, make sure that the parking brake of the semi-trailer is released.Repeat these actions every time when attaching the semi-trailer.ATTENTION!Any unauthorized persons are prohibited to stay between the tractor and semi-trailer whenattaching the semi-trailer!6.2. Loading of a semitrailer’s tipping bodyThe semi-trailer may be loaded only when it is attached to the tractor and stands on a horizontal surface.Before starting the loading operation, make sure that the tailgate and discharge port of the semi-trailerare fully closed.If the body is covered with a canopy, uncover it.When loading, it is necessary to distribute the load evenly throughout the body. When transportingmaterials that act the bottom of the body with a concentrated mass (e.g. large stones), cover the bottom ofthe body with wood boards.Do not overload in order to prevent spillage.If necessary, cover the load with a canopy. Secure the canopy reliably.If the items being transported project beyond the dimensions of the semi-trailer, follow therequirements of the traffic rules.While marking of the load and ensuring safety on the road.ATTENTION!It is prohibited to to exceed the maximum permissible total weight of the semi-trailer! In orderto avoid overloading, refer to the densities of the main materials to be transported set out in TableMaterial Density, kg/m3 Material Density, kg/m3Winter wheat 650-830 Fertilizers:Spring wheat 620-800 Granulated ammonium nitrate 800-1000Rye 650-790 Potassium salt, 30-40% 1000-1200Barley 580-750 Superphosphate 950-1100Maize 700-750 Lime powder 1500-1700Oat 390-500 Earth (soil) 1600-1800Buckwheat 640-700 Coal 1200-1600Pea 780-800 Construction waste 1400-1850Clover (seeds) 780-840 Concrete 1800-2800Rapeseed 700-750 Sand, gravel 1500-1900Sugar beets 570-700 Dry wood 500-800Potatoes 640-770 Bricks 1800-1900Combined Feed 480-690 Glass 2500-2700Chopped maize silage 200-250 Cement, rubber 1600-1700