LeeBoy 8608 - Mat Texture Adjustment

• For increased positive crown push down on
adjuster.
• For increased negative crown pull up on adjuster.
3. 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.
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 4-76)
• Negative crown is the lower in the center of
the screed plate, often used in an alley where
drainage is necessary. (Figure 4-7)
Figure 4-76. 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
There are three adjusters in each screed extension,
however the adjusters at each end are preset by the
dealer and do not need adjustment.
Adjust the mat texture using the Angle-of-Attack (AOA)
adjustment screw in the center to produce a smoother
or coarser mat texture. (Figure 4-77)
• The screed extension should be hot before making
any adjustments.
• Spray the bottom of the screed with cleaning
solvent BEFORE heating the screed.
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.
AOA
Figure 4-77. 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 wearplate and cause poor material
compaction, resulting in a poor nish.
44
Operation
8608 Commercial Paver 4-37