Great Plains 3S-4010HDF Operator Manual - Manual (Page 75)

Great Plains Manufacturing, Inc. Maintenance and Lubrication 71
03/28/2012 196-522M
Height Switch
The height switch turns the seed metering on and off as
the drill is lowered and raised. The switch
is mounted
between the parallel arms on the left rear wheel assem-
bly.
When the drill is lowered, the lower parallel arm contacts
the flexible switch arm extension (whisker)
and oper-
ates the switch.
If the switch is otherwise operating properly, but metering
is not stopping when raised, or not resuming when low-
ered, the switch may need some adjustment.
The whisker should extend over the lower parallel arm
enough so that the whisker cannot slip off the arm when
the drill is lowered, but not so far that it bends severely.
To adjust, loosen the screws
attaching the switch to
the bracket and slide the switch left or right as needed
and re-tighten.
The whisker should operate (enable seeding) whenever
the openers are just beginning to contact the ground.
To adjust:
1. Lower the implement until at a height where seeding
should start (usually just above ground).
2. Turn off the tractor and remove the key.
3. Securely support implement frame at this height with
jack stands or blocks.
4. Loosen switch bracket bolts .
5. Slide switch down until the flexible switch toggle is
just past the point at which the switch clicks (the
turn-on-seeding state).
6. Tighten the bolts.
FigureSpacer:
Figure 84
Implement Height Switch
29225
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