TY JOUR TI EXPERIMENTAL RESERCH RESULTS ON THE INFLUENCE OF THE COUPLING WEIGHT CHANGE ON THE TRACTOR CLASS 1,4 POWER BALANCE KW coupling weight KW slipping KW power balance JO Bulletin of KSAU AU Spiridanchuk, A.B. AU Shchitov, S.V. AU Spiridanchuk, N.V. PY 2013 IS PB Krasnoyarsk State Agrarian University