Marker operation, Row marker operation, Row unit operation – Great Plains PD8070 Operator Manual User Manual
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PD8070
Great Plains Manufacturing, Inc.
401-479M
2014-07-23
Marker Operation
Overhead Crushing Sharp Object Hazard:
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. A moving marker can cause
serious injury or death.
Dual markers are equipped with an automatic sequence
valve that controls which side activates, as well as
marker deployment.
Folding speed of dual markers is adjusted via set screws
on the sequence valve body. Excessive folding speed
may damage markers. See “Marker Folding Speed” on
page 41.
Row Marker Operation
To alternate which side is marked:
1.
Move the tractor’s circuit control to Retract. Hold until
marker is folded.
2.
Move the tractor’s circuit control to Extend. Hold until
the new side’s marker is fully unfolded.
3.
Return tractor control to neutral/off.
Markers can be raised simultaneously but must be
lowered one at a time. If both markers are required down
at the same time, run one marker down, momentarily
start to raise it, reverse the hydraulic lever and lower the
opposite marker.
Note: Holding the lever down will force both markers
down.
On a tractor where the oil flow cannot be controlled, the
rate of flow of oil from the tractor may be greater than the
rate at which the marker cylinder can accept it. Hold the
the tractor hydraulic control lever until the cylinder
reaches the end of its stroke. This occurs most often on
tractors with an open-center hydraulic system.
On tractors with a closed-center hydraulic system, the
tractor’s hydraulic flow control can be set so the tractor’s
detent will function properly.
Row Unit Operation
Never back up with row units in ground. If you do, check
all openers to be sure none are clogged. Always lift
planter out of ground when turning at row ends and for
other short-radius turns.
For information on planting-depth and down-pressure,
see “Row Implement Adjustments” on page 42.