4-28 LeeBoy 8515D Conveyor Paver
Operation
Setting the Crown
The screed can also be set to control the pavement
slope, or crown. A pavement crown is the elevation of
the middle in relation to the edges, and insures proper
drainage of the pavement.
To adjust the crown:
1. Loosen the lock-down bolts in slotted bars before
adjusting crown and valley mechanism. (Figure
4-51)
Figure 4-51. Loosen Lock-Down Bolts
2. Remove the crown handle and insert into adjuster.
(Figure 4-52)
3. For increased positive crown push down on
adjuster.
4. For increased negative crown pull up on adjuster.
5. Use the gauge at the center of the screed above the
standing platform. If the needle is above the zero,
you will have positive crown. If the needle is below
the zero, you will have negative crown.
6. To get exact crown or valley, measure the distance
between a at level surface to the center bottom
portion of screed. Make adjustments with crown and
valley control.
NOTE: Maximum crown is two inches.
9. When the material starts moving into the sonic
range, the sonic auger will automatically regulate
the auger operation.
NOTE: The material height must be set to the highest
point when the endgates are closed. When
the endgates are open, the material height will
lower to prevent material from pushing in front
of the endgates.
10. Begin paving, moving slowly at rst to adjust the
screed if needed.
11. Make a paving pass until the asphalt level in the
hopper is low.
Never back up with cut-off gates open.
NOTE: To prevent excessive handwork, set the left
and right conveyor conveyor switches to the
OFF position and set both cut-off switches to
the CLOSE position about three feet from the
end of the pull to prevent excessive handwork.
12. Return paver back to starting position to begin the
next pull.
13. Position and set the screed endgate on the joint
side back to “0” feet, or ush with bottom of the
screed.
14. Repeat these steps as you continue to pave.
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