Vaderstad RAPID RDA S Series, Инструкция по эксплуатации

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RDA 500-800 S
Ver.2 01.11.2002 31
3.7 Adjusting sowing depth
3.7.1 Adjusting the master and slave system
Figure 3.18
The sowing depth of the drill is controlled by three hydraulic rams connected in series in a so-
called master and slave system. Before using the drill for the first time, the rams must be bled and
their position zeroed in relation to each other thus:
Raise the drill to its topmost position so that all hydraulic rams are fully extended. Keep hold of
the hydraulic lever in this position with the tractor engine running at half speed for 15-20 seconds.
The rams have a transfer connection in the top position which means that oil can flow through the
system and flush out any remaining air. Always repeat this bleed procedure for a few seconds after
hitching on, before adjusting the drill, after unfolding and a few times during the working day.
After bleeding and zeroing the master and slave system, the sowing depth of the three sections can
be set. This must be done with the drill in working mode out in the field. Check that the folding
ram is fully extended and that the hydraulic pressure in the weight transfer system is normal, i.e.
30-50 bar. Set the required working depth using the aluminium depth stop on the piston rod of the
master ram which is located on the central section, see Position A. Drive forward and lower the
drill. Keep holding the hydraulic lever for a few seconds, for example until the bout markers un-
fold.
Check the sowing depth at the centre of each section, see
”4.1 Sowing depth” on page 68.
If nec-
essary, adjust the length of the piston rod on the relevant section. Normally, the rod of the master
ram is kept around 10 mm unscrewed and the rod lengths of the slave rams, which are on the side
sections, are adjusted instead. See Position B.
These adjustments must be made without removing any of the piston rod ends from the machine.
A Loosen the opposing nut (C)
B Turn the piston rod (B) with a spanner so that the rod end is screwed in or out. An outward
adjustment gives a shallower sowing depth.
NOTE! The piston rods may be difficult to turn
when the hydraulic rams are fully extended. Do not adjust the piston rod length beyond the dis-
tance.
C Tighten the opposing nut (C) against the end of the rod (B).
3.7.2 Setting sowing depth
After the master and slave system has been adjusted, the sowing depth can be easily set by moving
the depth stop (A) on the master ram. The scale does not show absolute sowing depths in centi-
metres but is only an index. After larger changes in sowing depth, the horizontal alignment of the
drill may require adjustment, see
”3.6 Horizontal alignment” on page 30. Zero and bleed the sys-
tem for about 5 seconds as described above on several occasions during the working day. See also
”4.1 Sowing depth” on page 68.