1.12.8. Screed Vibrators

TM 5-3895-373-20 1.12.8. Screed Vibrators. Screed vibrators are located on the main screed and left and right extension screeds. The vibrators are eccentric weighted shafts driven by hydraulic motors. Rotation of the eccentric shaft causes the screed to vibrate. The vibrator motors are turned on and off at the operator switch panel. When the switch is placed up, "AUTO" position, the vibrators run only when the paving machine is travelling forward. An adjustable flow control is used to adjust vibration frequency. The vibrators are used to compact the paving material passing underneath the screed plates. 1.12.9. Relay and Circuit Breaker Panel. A relay and circuit breaker panel is located inside the operator control panel. The relay and breaker panel is equipped with four relays and ten circuit breakers. Two relays turn separate voltages on and off to the neutral start and engine induction heater relays located on the voltage transformer panel. The other two relays control automatic functions of the screed vibration and auger/conveyor drives. There are seven manual reset circuit breakers and three breakers that automatically reset 10 seconds after an overload condition is removed. 1-13