GREAT PLAINS Yield-Pro Air-Pro YP2425A, Operator'S Manual

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YP2425A Table of Contents Index Operating Instructions
Great Plains | 401-626M | 2019-06-11 Table of Contents Index 39
Marker Operation
Overhead Hazard:
To prevent serious injury or death, 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.
If your YP2425A Planter has markers, unfolding of the
markers is performed only after unfolding the wings.
The Marker/Aux valve on the left wing must be set to
“Marker”. See “ Auxiliary Hydraulics ” on page 38.
Before operating markers, make sure cylinders are
properly bled. See “ Bleeding Hydraulics ” on page 107.
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 61
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
Length Adjustment ” on page 62.
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 “ Dual Marker Speed
Adjustment ” on page 63.
Electrocution Hazard:
Beware of overhead electrical lines. If the markers get too
near to lines, the tractor, raised planter and any cart can
become “hot” with no indication. A person standing on the
ground and near equipment can complete the circuit. Serious
injury or death is likely. At higher voltages electrocution can
occur without direct contact.
Figure 42
Marker Unfolding
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