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- By the way of creating pressure between the disks: spring,
           centrifugal, lever, electric, combined.
               You need to know the advantages and disadvantages of each
           design and scope of its use.
                   Find out the cause of torsional oscillations  in  powertrains
           ATV and how they are extinguished. The friction-type fluctuation
           is due to the friction of the friction rings on the flask of the hub of
           the  driven  disc,  and  not  because  of  the  compression  of
           tangentially-marked  springs,  which  are  mounted  between  the
           driven disc and its hub.
               It  is  necessary  to  pay  attention,  how  to  prevent  the  springs
           from  overheating  during  "coupling"  of  the  clutch  and  what
           methods provide a heat dissipation from the surfaces of friction.
               Considering work of the clutch in the process of inclusion it is
           recommended to show the arrows on the diagram of the direction
           of forces acting on the details of the mechanism and drive, and to
           find out whether or not the effort is transmitted under the pedal on
           the crankshaft of the engine.
               It  is  necessary  to  master  the  structure  and  operation  of  the
           clutch,  to  find  the  adjusting  devices  in  the  mechanism  and  the
           drive,  to  clarify  its  purpose  and  the  sequence  of  conducting
           regulatory operations.
               It  is  necessary  to  know  in  what  sequence  the  assemblage  is
           assembled and disassembled.
               The gearbox  is a part of the power transmission of the car.
               Gearboxes are classified:
               - by way of changing the transfer number: step by step,
           continuous, combined;
               - by the method of torque conversion: mechanical, hydraulic,
           electric and combined;
               - by way of regulation: self-adjusting with internal automatics,
           with forced adjustment due to external action, with a combined
           control method.
               On modern vehicles, the most popular step-by-step gearboxes.
           They  represent  gear  reducers  and  are  characterized  by  a  large
           number of different designs.
               When studying gearbox and distribution boxes it is necessary
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