TY JOUR TI THE WORK OF THE EXCAVATOR HYDRAULIC SYSTEM IN THE EXTREMELY HIGH TEMPERATURE CONDITIONS KW hydraulic machines KW hydraulic drive work efficiency KW temperature mode stabilization KW efficiency KW heater KW single-bucket excavator JO Bulletin of KSAU AU Kaverzina, A.A. AU Mokhammad, A.A. PY 2014 IS PB Krasnoyarsk State Agrarian University