Great Plains YP2425A Operator Manual - Manual (Page 41)

Great Plains Manufacturing, Inc. Table of Contents Index Operating Instructions 37
2014-02-10 Table of Contents Index 401-626M
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 36.
Before operating markers, make sure cylinders are
properly bled. See “Bleeding Hydraulics” on page 105.
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 54
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 55.
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 56.
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
26042