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9.8.4 Irregular sowing pattern
If the seed flow rate has been set correctly, the seed on the overseeded surface should be
hardly visible. The seed visible in the grooves should have constant density along the entire work
width. If you notice an irregular seeding pattern whilst working, i.e. no seed in some places and
lots of seed in others, then this be the result of the following cause:
• The seed dispensed from the seed container is guided into the groove through outlets, using
air injection.
• Sometimes, one or more outlets get blocked because of dirt, moisture or a blocked scattering
slot, and they will no longer be able to scatter seeds. These blockages will usually dissolve
automatically, and the seed that was obstructed in the outlet(s) will be scattered in one go,
causing an abundance of seed in places. This will obviously be visible in the lawn once the
seed germinates. As soon as any irregularities are detected, the problem outlets should be
inspected.
Reoccurring seed flow irregularities across the work width could be the result of the following:
• To ensure a continuous seed flow, a jack is fitted at the bottom of the seed container. This is
driven by a chain and runs synchronously with the machine’s operating speed. A failing drive
will result in a slow and irregular seed flow. Possible causes of failure:
o
Broken chain.
o
Dislocated chain.
o
Locking pin on the sprocket of the jack axis failed.
o
Sprocket on roller came loose.
o
Locking pins of the jack on the driving axis came loose.
9.8.5 A trail of damage to the lawn
Whilst overseeding, one could suddenly inflict an abnormal trail of damage in a worked lane. This
damage could be caused by the following:
• Since the blades do the ground work, they will be the first to be examined. Presumably, one
or more blades struck an object in the ground, causing it to become bent and carve out wide,
unsightly grooves. Read § “11.4.8
Checking the blades” on page 65
• It is possible that an object has become wrapped around the blade axle and causes a damage
trail apart from the blades themselves.
9.8.7 Undesired activation from transport or operation mode.
If ever during operation or overseeding, the machine suddenly switches from operation mode to
transport mode or vice versa, then the following problems could arise as a result:
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