Great Plains 2525A Operator Manual - Manual (Page 32)

28 2025A/2525A Table of Contents Index Great Plains Manufacturing, Inc.
118-999M Table of Contents Index 2013-06-04
Marker Operation (Option)
Optional marker attachments are available from your
Great Plains dealer.
The operating procedure is different, depending on
whether dual-circuit independent markers or single-cir-
cuit sequenced markers are installed.
When fully extended or folded during operations or trans-
port, leave circuit control in Neutral. Set circuit to Float
only for unhitching.
Before operating markers, make sure hydraulics are
properly bled as described under “Bleeding Marker
Hydraulics” on page 76, and markers are operating at a
safe speed, per “Marker Speed Adjustment” on
page 98.
This section presumes correct marker length for your
pass spacing. If this has not been set, or needs to be
changed, see “Marker Extension” on page 100.
This section presumes correct marker chain slack. If your
chain has been replaced, repaired or stretched, adjust
the links to the correct slack length. see “Marker Chain
Adjustment” on page 99.
Independent Marker Operation
Each marker is on a dedicated tractor hydraulic circuit.
Either or both may be extended or retracted indepen-
dently by operating the circuit for that marker.
Single-Circuit Sequenced Marker Operation
Dual markers equipped with a sequence valve are pow-
ered by the same hydraulic circuit. Starting with both
markers folded, the folding sequence is:
Activate lever - Right unfolds; left stays folded.
Reverse lever - Right folds; left stays folded.
Activate lever - Left unfolds; right stays folded.
Reverse lever - Left folds up; right stays folded.
Sequence repeats.
Both Sides Unfolded (with Sequence Valve)
With both markers in their cradles:
Unfold either side, and when completely deployed-
Move lever/switch to Retract momentarily, and return to
Extend to deploy other side.
Electrocution Hazard:
Beware of overhead electrical lines. If the markers contact
lines, the tractor, raised drill and any cart can become “hot”
with no indication. A person standing on the ground and
touching equipment can complete the circuit. Serious injury or
death is likely. At higher voltages electrocution can occur
without direct contact.
Overhead Crushing and 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. Serious injury or death is possible.
Equipment Damage / Low Population Risks:
Folding markers at high speed can damage markers, and
starve seed meters of pressurization air. Refer to “Marker
Speed Adjustment” on page 98, and adjust folding speed to a
safe rate.
Note: If one or both markers are extended, they may
drag or shove if left extended during drill raise or
lower operations. To avoid this, fold markers prior
to raise or lower.