TY JOUR TI MINIMIZATION OF FUEL LEAKS IN WASTE PLUNGER ELEMENTS BY DISPLACEMENT OF WEAR ZONES KW plunger elements KW local areas of wear KW fuel leaks KW hydraulic characteristics JO Vestnik of Kazan State Agrarian University AU Gavrilov, V.N. AU Novikov, A.M. AU Semenov, A.V. AU Ivanov, V.A. PY 2020 IS PB Kazan state agrarian University