horsch Maestro 12.45 CV, Operating Instructions Manual

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Troubleshooting
Fault Possible cause Remedy
Too many missed seeds Working speed too high Reduce working speed.
Required grain frequency (grains/s)
too high
Reduce working speed.
Vacuum too low • Increase overpressure.
• Check lines and connections for
leaks.
Grain feed gate set incorrectly Set the grain feed gate correctly.
Adjustments in both directions may
produce improvements.
• First set the gate valve upward
(greater number).
• Set the gate valve down (smaller
number) if no improvement is
produced.
• Check filling level of the metering
disc, see Section Metering unit
Metering disc too small Switch to larger metering disc.
Wrong scraper Replace the scraper.
Air supply grille soiled Clean air supply grille.
Grain sensor dirty Clean downpipe with the supplied
brush.
Grain geometry misshapen or
inhomogeneous
• Reduce working speed.
• Increase the vacuum.
• Use homogeneous batch.
Separating units and metering discs
soiled by deposits (dressing, dust)
Clean dirty parts.
Too many double seeds Vacuum too high • Reduce the vacuum.
• Reduce the fan speed.
Metering disc too large Switch to smaller metering disc.
Variation coefficient too high
(display in E-Manager)
Required grain frequency (grains/s)
too high
Reduce working speed.
Vacuum incorrectly adjusted Adapt the fan speed.
Too many missing/double seeds • Check area of grain dispensing in
the metering unit and downpipe for
sharp edges.
• Check bristles on the brush.
Separating units and metering discs
soiled by deposits (dressing, dust)
Clean dirty parts.
MF 107