Atlas Copco DYNAPAC Svedala Demag DF 115 C, Operation & Maintenance Manual

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D 1.4 11
D_1
.4_0
1_G
B.
fm
1
1
-2
2
Item Designation Brief description
20
Screed position
A Lift the screed.
B Lock the screed (the position appropriate for inserting the
transportation safeguard of the screed)
C Lower the screed and set it to „Floating position“
m
During paving, the screed must always be in the float-
ing position. The same applies to temporary stops and
the case of changing trucks.
21
Screed control
in case of stopped
paver finisher
With this function the hydraulic unit of the screed can be con-
trolled to prevent the lowering of the screed, when the paver
finisher is stopped (temporary stopping).
A automatic- if the drivearm (9) is in central position, in case
of stopping the paver finisher, the screed is controlled by
about 20 bar preliminary pressure.
- Position C can be used for setting the paver finisher, posi-
tion A can be used for paving.
C: switched off- if the drivearm (9) is in central position, in
case of stopping the paver finisher, the screed is only main-
tained in floating position / controlled.
f
In case of transportation or maintenance operations al-
ways insert the mechanical transportation safeguard of
the screed.
22
Screed loading/
offloading
The screed can be thus loaded or offloaded to change the
traction force or compacting.
A: Relieving (screed ‘lighter’)
B: Function Off
C: Charging (screed ‘heavier’)
- With the help of pressure regulating valve (93) the height of
loading and offloading must be adjusted.
- For the function „Stop screed with prestressing“ select posi-
tion A (see switch (21b) and pressure regulator valve
(93a)).
23
Starter switch
„Temporary pres-
sure load when
laying is started“
To start the screed with preselected pressure load.
-
The time limit can be set between 0.5 and 30 sec.
A
This function prevents the floating of the screed, e.g. in
case of temporary stopping or changing trucks.
After the expiry of the preset delay time of the pressure load,
the machine automatically switches to floating position.
A
B
C
A
C
A
B
C