horsch Focus 4 TD, Operating Instructions Manual, Page: 81 / 108

Metering unit | 10
60059040 • 02 • 07/2021 • en 81
Function test Ø
After installing a new rotor its function and concentricity must be checked.
Ø
For this purpose switch on the rotor as described in the section "Calibration
test".
The drive motor must run "smoothly". No stiff points should be recognizable.
Ø
Check the motor for smooth running. Untrue running causes inaccurate meter-
ing and may overload the motor.
Ø
If possible locate the stiff point.
Ø
Rework damaged parts (by machining ...) or replace.
Ø Loosen the screws on the side covers for drive motor and rotor bearing and re-
align the side covers to release any tensions.
Ø
If the drive shaft has been bent, realign or replace it.
Ø
Remove any foreign bodies that may have been jammed between roller and
housing.
Ø If dust or dressing in the rotor has entered between cell discs and spacers dis-
mantle and clean the rotor.
10.1.6 Rape brushes
The rape brushes clean the cell discs in the rotors for fine seeds.
Before sowing fine seeds the rape brushes must be installed in the side cover and
their function must be checked.
Rape brushes assembled
Ø
Check concentricity and fastening.
Ø Check condition and cleaning effect of brushes.
Ø
Install the side cover with the brushes into the metering unit.
Ø
The brushes must firmly rest against the cell discs and should rotate with the
rotor.
Sticking cell discs cause metering errors during sowing. Less seed is placed.
The side cover with the rape brushes can be removed even when the seed hopper is
full.
Sticking cell discs can then also be cleaned in assembled condition.
The rape brushes should be disassembled when sowing normal seeds. The housing
holes must be closed.