Great Plains NTA3007HD Operator Manual - Manual (Page 66)

62 NTA907HD or NTA3007HD
166-207M 04/04/2011
Before Operating Markers
Marker circuits must be fully charged with oil and free of
air before operation. Prior to first use, or after mainte-
nance, perform “Marker Hydraulic Bleeding” on page
131.
Dual Marker Operation
Dual markers are on circuit which contains an adjustable
automatic sequence valve. This valve is on a hydraulic
circuit shared with Fold and Tilt cylinders.
1. To prevent unexpected marker movement when
enabling the marker solenoid valve, set the shared
circuit to Neutral or Float before operating the
switches.
2. Enable markers at the CFM switch. Set Fold and Tilt
off, then Marker on.
3. Clear the area within 5m (15ft) of marker arms on
both sides of the drill.
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.
4. Carefully move the circuit lever to extend and
observe which marker side is extending.
5. 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.
6. When marker is fully extended, set circuit to Neutral.
7. To fold marker, set circuit to Retract until marker is in
cradle.
8. To extend other side, Extend once more, as at
step 5.
Null4:
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:
Marker Enable: Hydraulic Circuit Operation
Lift
Fan,
Auger
Fold, Tilt,
Marker
Transport
Hooks
Neutral Neutral Neutral Neutral
Null4:
Figure 69
CFM Marker Enable
29380
Null4:
Marker Extend: Hydraulic Circuit Operation
Lift
Fan,
Auger
Fold, Tilt,
Marker
Transport
Hooks
Neutral Neutral Extend Neutral
Null4:
Marker Fold: Hydraulic Circuit Operation
Lift
Fan,
Auger
Fold, Tilt,
Marker
Transport
Hooks
Neutral Neutral Retract Neutral