Great Plains NTA2007HD Operator Manual - Manual (Page 63)

Great Plains Manufacturing, Inc. Contents Index Operating Instructions 59
04/04/2011 Contents Index 166-283M
Marker Safety Information
Electrocution Hazard / Machine Damage Risk:
Never fold implement with a marker extended. Never extend a
marker with implement folded. Operate markers only with drill
completely unfolded. A marker extended when folded is a
major overhead electrocution hazard, overhead clearance haz-
ard, and may damage drill systems.
Sweep and Pinch/Crush Marker Hazards:
Do not allow anyone to stand near or beyond the end of the
wings during marker operations. A folding marker can cause
serious or fatal crushing injuries. Marker disk is sharp. A fold-
ing or unfolding marker can cause serious lacerations and
cause falls.
Marker Unfold and Fold
1. Clear the area within 4m (12ft) of marker arms on
both sides of the drill.
2. Carefully move the circuit lever to extend and
observe which marker side is extending.
Refer to Figure 55
3.
If the marker extending is not on the desired side,
reverse the lever (to retract) until the marker returns
to the cradle
. Set the control to Neutral briefly,
then to Extend again. This cycles the sequence
valve and extends the alternate marker.
4. When marker is fully extended, set circuit to Neutral.
5. To fold marker, set circuit to Retract until marker is in
cradle.
6. To extend other side, Extend once more, as at
step 3.
Special Dual-Marker Operations
Passes with same marker side:
• Retract (raise) the marker and make the turn.
• Begin to extend the opposite marker.
• Retract it, and extend the original marker.
Both markers unfolded:
• Fully extend one side.
• Momentarily Retract, then Extend to deploy opposite
side.
Null4:
Figure 56
Marker Unfolded
31178
Note: Which marker side extends at circuit activation is
somewhat unpredictable, as it depends on the
final state of the sequence valve at last use.
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