horsch Tiger AS Series Operating Instructions Manual page 72

Maintenance
The function and operability of fine seed rollers
must be checked every day.
There should be no gap between the cell
¾
discs. If the gap is too big, additional shims
must be added.
The cell discs must be light turning. Dressing
¾
or similar materials must not block cell discs
or bearings.
The safety clips must be in place and correctly
¾
assembled to avoid the formation of a gap.
Assembly note
Cell discs and spacers are assembled with
shims to keep the roller assembly tight, thus
ensuring that no seed will enter between cell
discs and spacers.
Roller for fine seeds
The spacers are equipped with bearings.
Depending on the manufacturing tolerance
shims are added to avoid any friction between
cell discs and spacers.
After the assembly of all parts the remaining gap
to the lock washer is filled up with shims.
Finally assemble the lock washer.
64
With the roller correctly assembled the cell discs
between the spacers can just be freely turned.
The parts should not rub against one another,
but the clearance should be as small as possible.
When checking against a light source the gap
should just be visible.
Function test
After installing a new roller the function and
concentricity of the new roller must be checked.
For this purpose switch on the roller as described
in the section "Calibration test".
The drive motor must run "smoothly". No stiff
¾
points should be recognizable.
Untrue running causes inaccurate me-
tering and may overload the motor.
If possible locate the stiff point.
¾
Rework damaged parts (by machining ...) or
¾
replace.
Loosen the screws on the side covers for drive
¾
motor and roller bearing and realign the side
covers to release tension.
If the drive shaft has been bent, realign or
¾
replace it.
Remove any foreign bodies that may have
¾
been jammed between roller and housing.
If dust or dressing in the roller has entered
¾
between cell discs and spacers dismantle and
clean the roller.