Vaderstad Rapid RDA 400S, Original Instructions Manual

Page: 118 / 138

Troubleshooting
118 27.06.2011
ver. 2
The drill is sinking, i.e. it drills
deeper than the set drilling
depth! - Is the O-ring on the master ram's cut-off valve dam-
aged or missing? See
”5.14 Changing the valve seals
on the lifting ram” on page 103.
- Does the stop bolt touch the bottom at the rod's upper
end? In this case the spring has been compressed or is
damaged.
The discs do not rotate properly! - Are the seed boxes exposed to undue stress? The seed
boxes should sit very lightly.
- Is the soil very soft? It may be necessary to compact
the soil using a roller.
- Is the sowing depth too shallow?
- Have the seed boxes been installed too low? The discs
afford better traction if the seed boxes are raised one
notch.
- Are discs excessively worn?
- Does the soil surface contain a lot of plant scrubs?
- Are the tines of the front implement set too hard re-
sulting in soil that is too loose?
The drill does not place seed at
the bottom of the furrow! - Are the seed boxes excessively worn?
- Are the seed boxes set one notch too high? The drill
will place the seed more precisely if the boxes are set
low. This does not normally need to be changed for
different soil types.
Irregular fan speed! - Replace the hydraulic filter.
Irregular output seed amount ! - Replace the proportional valve in the fan unit.