3. HYDRAULIC FRONT AXLE SUSPENSION DESCRIPTION 3. HYDRAULIC FRONT AXLE SUSPENSION DESCRIPTION The function of the hydraulic front suspension system is to absorb impacts when travelling over rough terrain and to keep the tractor body on an even keel on the road. The system comprises swinging axle support arm (1) position sensor (2) 2 suspension cylinders (3) front suspension control valve (4) electronic control unit (5) 4 5 3 2 1 D000 4720 10-32