LeeBoy 8616B - Hydraulic Cut-Off Gates; Sonic Auger

Hydraulic Cut-Off Gates
The cut-off gates are another important function of the
paver. The cut-off gates are used primarily to control
the ow of asphalt to the screed. (Figure 4-18)
Cut-O 
Gate
Figure 4-18. Cut-Off Gate
Cut-offs can be used to limit material ow when making
narrow passes at the beginning and ending of each
pass or pull.
NEVER backup with the cut-off gates
open. The cut-off gates are designed to break away
from cylinders when hitting a manhole or other
object when forward, but not in reverse.
• The right and left cut-off switches on the operator
control panel open and close the cut-off gates.
• Holding the switch in the OPEN positions increases
asphalt ow to the screed. Holding the switch in
the CLOSED position decreases asphalt ow to the
screed.
Sonic Auger
The sonic auger controls the amount of material owing
to the endgates, gauging the amount of paving material
in the extensions. An operator can operate the sonic
auger from either side of the paver. (Figure 4-19)
A sonic auger sensor connects from the paver to the
screed. It detects the pile height and controls the
conveyor and auger speed by regulating the hydraulic
pump output.
The sonic auger sensors are most often used when
paving widths of nine to 15 feet (2.7 - 4.6 meters).
Sonic
Auger
Sensor
Auger
Figure 4-19. Sonic Auger Sensor
• The right and left auger dials on the screed control
box (Page 3-8) controls pile height. Turning
the dials clockwise increases pile height while
counterclockwise decreases pile height.
• When the pile height moves into the sonic range,
the auger speed will slow down proportionately
and turn off. It will turn back on when the material
level drops.
• The sonic auger sensors are not used in the
manual mode.
NOTE: Auger speed is adjusted only in the
manual mode. Conveyors can be adjusted
separately in both manual or auto modes.
4
Operation
LeeBoy 8616B Conveyor Paver 4-15