Svedala-Demag DF 115 C, Руководство по эксплуатации, Страница: 114 / 178

D 74
D
D_DF1
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G
B
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. 74-
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02-
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3
Screed stop
The „screed stop” function is used to block the screed hydraulics to prevent the
screed from lowering when the paver finisher stops during paving.
The switches (34) have to be switched off
- Automatic screed stop when the drive
lever is in the center position
- To lift the screed press button (45A)
- To lower the screed press 1.5 sec.
button (45B)
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The screed block function is not sufficient as a safeguard during transport or mainte-
nance work!
In such a case, the screed transport safeguard must be inserted.
Screed stop with pretensioning
As for charging/relieving, a pressure of 2-50 bar can be individually applied to the
screed lifting cylinders. This pressure can neutralize the weight of the screed to pre-
vent the screed from sinking into the freshly laid material, thus supporting the screed
stop function, especially in those situation where the screed relieving function is used.
The pressure to be applied depends on the load-bearing capacity of the material. If
necessary, the pressure must be readjusted or changed as required during the first
stops until the lower edge of the screed no longer leaves any marks when the finisher
moves on again.
A pressure greater than 10-15 bar neutralizes the screed weight, thus preventing the
screed from sinking into the material.
When combining the ”screed stop” and ”screed relieving” functions, make sure that
the pressure difference between the two functions does not exceed 10-15 bar.
Especially in those cases where the ”screed relieving” function is only briefly used as
a start-up aid, there is a danger of uncontrolled floating when starting up again.
Do not use the ”screed stop with pretensioning” function while paving with the ”screed
stop” function.
Bohlensch.Tif
34
B
A
45