Great Plains 3S-4000HDF Operator Manual - Manual (Page 47)

Great Plains Manufacturing, Inc. Table of Contents Index Operating Instructions 43
2013-06-13 Table of Contents Index 195-067M
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 Marker Hydraulics” on page 79.
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 68.
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 66.
Figure 38
Fold / Marker Selector
15550
1
2
1 2