LeeBoy 5300B - Mat Texture Adjustment

4. 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.
• Positive crown is when the middle of the mat
is raised to permit water to drain to each side.
(Figure 4-55)
• Negative crown is the lower in the center of
the screed plate, often used in an alley where
drainage is necessary.
Figure 4-55. Crown Settings
1 - Positive (+)
2 - Zero (0)
3 - Negative (-)
NOTE: Crown may be placed in the leading edge
and/or the trailing edge of the screed plate.
Crown in the leading edge aids material ow
under the screed plate only. Trailing edge
crown puts a crown in the mat.
Example: The trailing edge crown is 0 and the
leading edge crown is 1/8 inch. There will not be
any crown in the mat, but the material ow under the
screed plate will be improved.
Mat Texture AdjustmentMat Texture Adjustment
Adjust the mat texture using the Angle-of-Attack (AOA)
adjuster (in the center of each extension) to produce a
smooth or coarse mat texture. (Figure 4-56)
• The screed extension should be hot before making
any adjustments.
• Spray the bottom of the screed with cleaning
solvent BEFORE heating the screed.
• Vertical adjusters are located on the main screed
that are preset by the factory/dealer, therefore,
need no adjustment.
NEVER spray cleaning solvent or
release agent on or near a hot screed heating or near
open ame. Cleaning solvent and release agents are
ammable and could cause serious personal injury.
NOTE: Do not allow release agent chemicals to run
onto the ground.
Figure 4-56. AOA Adjustment
To make the AOA adjustment:
1. Spray down and heat screed extension if needed.
2. Turn the AOA adjuster in the direction for desired
result:
• Turning the AOA adjuster counterclockwise
will increase the pressure on the back of the
extension, which gives a smoother, slicker
nish.
• Turning the adjusters clockwise will decrease
the pressure on the back of the extension,
resulting in a coarser nish.
NOTE: Too much pressure on the back of the
screed extension will take the weight off the
screed wear plate and cause poor material
compaction, resulting in a poor nish.
44
Operation
LeeBoy Model 5300B Compact Paver 4-45