Great Plains 2S-2600HDF Operator Manual v2 - Manual (Page 45)

Great Plains Manufacturing, Inc. Table of Contents Index Operating Instructions 41
2014-02-03 Table of Contents Index 195-069M
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 trac-
tor, there is a second selector valve, for the lift circuits,
mounted above the marker/fold selector.
Refer to Figure 40
After drill is unfolded for field operation, move dou-
ble-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 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 con-
trol marker folding speed. Excessive folding speed can
damage markers, so adjust needle valve to a safe oper-
ating speed as described under “Marker Speed” on
page 73.
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 adjust-
ment screws on sequence-valve body. Excessive folding
speed can damage markers, so adjust markers to a safe
folding speed as described under “Marker Adjust-
ments” on page 70.
Figure 40
Fold / Marker Selector
15550
1
2
1
2