Great Plains 3S-3000HDF Operator Manual v2 - Manual (Page 46)

42 3S-3000HD Table of Contents Index Great Plains Manufacturing, Inc.
195-068M Table of Contents Index 2014-02-11
Marker Operation
Optional markers are equipped with a double-selector
valve, on the tongue near the hitch, to combine the
box-fold circuit with the marker circuit. On a 2-outlet
tractor, there is a second selector valve, for the lift
circuits, mounted above the marker/fold selector.
Refer to Figure 38
After drill is unfolded for field operation, move
double-selector valve handle from forward fold position
to marker circuit (back ). Before operating markers,
make sure they are properly bled as described in
“Bleeding Hydraulics” on page 69.
Single Marker Operations
To operate a single marker, activate tractor remote
hydraulic lever to move marker in desired direction.
Single markers are equipped with a needle valve to
control marker folding speed. Excessive folding speed
can damage markers, so adjust needle valve to a safe
operating speed as described under “Marker Speed” on
page 62.
Dual Marker Operations
Dual markers are equipped with an automatic sequence
valve to control lift sequence. Starting with both markers
up, the sequence is:
• Activate hydraulic lever; right marker lowers while left
marker stays up.
• Reverse hydraulic lever; right marker raises while left
marker stays up.
• Activate hydraulic lever; left marker lowers while right
marker stays up.
• Reverse hydraulic lever; left marker raises while right
marker stays up.
Pattern repeats.
Folding speed of dual markers is adjusted with
adjustment screws on sequence-valve body. Excessive
folding speed can damage markers, so adjust markers to
a safe folding speed as described under “Marker
Adjustments” on page 59.
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Figure 38
Fold / Marker Selector
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