Marker operation – Great Plains 3S-4000F Operator Manual User Manual
Page 46
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3S-4000
Great Plains Manufacturing, Inc.
195-394M
2014-06-10
Marker Operation
Overhead Hazard:
To prevent serious injury or death, do not allow anyone to
stand near or beyond the end of the wings during marker
operations. Marker arms are heavy and marker discs may be
sharp.
Optional markers are equipped with a double-selector
valve to combine the box-fold circuit with the marker
circuit.
Refer to Figure 37
After drill is unfolded for field operation, shift
double-selector valve to marker circuit. Before operating
markers, make sure they are properly bled as described
in “Bleeding Hydraulics” on page 74.
To operate a single marker, activate tractor remote
hydraulic lever to move marker in desired direction.
Single markers are equipped with a needle valve to
control marker folding speed. Excessive folding speed
can damage markers, so adjust needle valve to a safe
operating speed as described under “Marker
Adjustments” on page 64.
Dual markers are equipped with a sequence valve to
control lift sequence. Starting with both markers up, the
sequence is:
1.
Activate hydraulic lever; right marker lowers while left
marker stays up.
2.
Reverse hydraulic lever; right marker raises while left
marker stays up.
3.
Activate hydraulic lever; left marker lowers while right
marker stays up.
4.
Reverse hydraulic lever; left marker raises while right
marker stays up.
5.
Pattern repeats.
Folding speed of dual markers is adjusted with
adjustment screws on sequence-valve body. Excessive
folding speed can damage markers, so adjust markers to
a safe folding speed as described under “Marker
Adjustments” on page 64.
Electrocution Hazard:
Beware of overhead electrical lines. If the markers get too
near to lines, the tractor and drill can become “hot” with no
indication. A person standing on the ground and near
equipment can complete the circuit. Serious injury or death is
likely. At higher voltages electrocution can occur without
direct contact.
Figure 37
Shifting the Double Selector Valve
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