Marker operation (option) s/n, Before operating markers, Marker unfold (one side) – Great Plains YP825A3P Operator Manual User Manual
Page 38: Row marker operation, Marker controls
Great Plains Manufacturing, Inc.
Marker Operation (Option) S/N+
THIS PAGE APPLIES ONLY TO MODELS:
(YP3P425A s/n B1005M+)
(YP3P625A s/n B1007P+) (YP3P825A s/n B1008R+)
Before Operating Markers
• Make sure cylinders are properly bled. See “Marker
• This section presumes correct marker extension for
your pass spacing. If this has not been set, or needs to
be changed, see “Marker Extension” on page 114.
• Markers are equipped with an automatic sequence
valve that controls which side activates, as well as
marker deployment speed. Marker folding speed is
adjusted via set screws on the sequence valve body.
Excessive folding speed may damage markers. Set
speed prior to first field operations. See “Marker
Speed Adjustment” on page 113.
Marker Unfold (one side)
Move tractor hydraulic control (lever or switch) for the
marker circuit (typically to Extend). Hold until marker
is completely unfolded. Do not leave tractor control in
If the marker side operating is not the desired side,
let it unfold part way, and move the tractor’s circuit
control to Retract. When the marker is folded, move
the circuit control to Extend to activate the other side.
Row Marker Operation
To alternate which side is marked:
Move the tractor’s circuit control to Retract. Hold until
marker is folded.
Move the tractor’s circuit control to Extend. Hold until
the new side’s marker is fully unfolded.
Return tractor control to neutral/off.
The marker controls are in circuit with the lift controls.
The markers raise and lower with the planter.
When the planter is lowered:
• One side marker will unfold.
• Hold the hydraulic control until marker is fully
When the planter is raised:
• The marker will fold up.
• Hold the hydraulic control until the marker is fully
The next time the planter is lowered the opposite side
marker will unfold.
Overhead, Crushing and Sharp Object Hazards:
Do not allow anyone to stand near or beyond the end of the
wings during marker operations. There is risk of serious injury
or death for anyone in the path of a marker. Marker arms are
heavy, are under tremendous hydraulic power, and may move
suddenly if the hydraulic system is damaged or needs bleeding.
Marker discs may be sharp.