Great Plains 2525P Operator Manual - Manual (Page 25)

Great Plains Manufacturing, Inc. Operating Instructions 21
2013-05-10 118-231M
Marker Operation
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
transport, leave circuit control in neutral. Set circuit to
float only for unhitching.
Before operating markers, make sure hydraulics are
properly bled as described under “Marker Mainte-
nance” on page 56.
This section presumes correct marker length for your
pass spacing. If this has not been set, or needs to be
changed, see “Marker Width” on page 25
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 26.
You can adjust marker folding speed. Refer to “Marker
Speed” on page 27, and adjust folding speed to a safe
rate. Folding markers at high speed can damage mark-
ers.
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.
Dual-Circuit 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:
1. Activate lever - Right unfolds; left stays folded.
2. Reverse lever - Right folds; left stays folded.
3. Activate lever - Left unfolds; right stays folded.
4. Reverse lever - Left folds up; right stays folded.
5. Sequence repeats.
Both Sides Unfolded (with Sequence Valve)
With both markers in their cradles:
1. Unfold either side, and when completely deployed…
2. Move lever/switch to Retract momentarily, and
return to Extend to deploy other side.