Fayat Bomag CR 820 T Tier 4, Инструкция по эксплуатации, Инструкция по техническому обслуживанию

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7 Standard Operating Procedures
Date May 2020
Page 7-9
Operations Manual
CR 820 T
Figure 7.16 - Elevate Screed to Starting Level
Place boards or lath that equal the amount of com-
paction in the joint area.
Remember that compaction rates change due to
the thickness of the material and material design.
Place lath at the edge of the joint to elevate and
support the screed to the correct starting level.
Preheat the screed to the temperature of the mate-
rial being used.
A cold screed will not only tear the surface of the
mat being placed but will also have a tendency to
come off the joint low, creating a depression in the
mat.
Figure 7.17 - Align Screed
Back the paver up over the joint.
Align the screed so that the face or moldboard is
square with the edge of the joint.
Lower the screed onto the boards or lath.
Null the screed. See Null the Screed earlier in this
chapter for instructions.
Fill the auger chamber no more than 1/2 an auger
level.
Do not over fill the auger chamber, as this is the
most common cause of creating a bump just after
pulling off a joint. If needed, the corner areas on the
ends of the screed should be hand-filled to prevent
force feeding an excessive high head of material in
the center areas of the screed.
Move the paver forward slowly, allowing the screed
operator time to check and correct the depth if nec-
essary.
Set the feeder controls to AUTO.
Check the feed sensors.
Set the feed sensors to maintain the correct head
of material.
Check the joint after the paver has moved away
from the joint area and make sure it is ready for
rolling.
Figure 7.18 - Remove Excess Material
Remove the excess or overlap material (1). This
material cannot be compacted into a cold or exist-
ing mat (2).
Do not shovel this overlap material back onto the
fresh mat as this extra material might not be com-
pacted down to the same height as the rest of the
joint. This could create a bump.
Check the joint with a good straight edge to ensure
the thickness of the new mat is correct.
If the new mat does not have enough material thick-
ness at the joint when it is rolled, the density in the
area where the new mat joins to the old mat will be