Great Plains 3N-4025P Operator Manual - Manual (Page 40)

36 3N-40P Table of Contents Index Great Plains Manufacturing, Inc.
196-538M Table of Contents Index 2014-01-29
Marker Operation (Option)
Markers are on a separate hydraulic circuit on the drill.
Before operating markers, make sure they are properly
bled as described in “Bleeding Markers” on page 147.
Dual markers are equipped with a sequence valve to
control lift sequence. Starting with both markers up, the
sequence is:
1. Activate tractor hydraulic lever; right marker lowers
while left marker stays up.
2. Reverse hydraulic lever; right marker raises while left
marker stays up.
3. Activate hydraulic lever; left marker lowers while right
marker stays up.
4. Reverse hydraulic lever; left marker raises while right
marker stays up.
5. Pattern repeats.
Folding speed of dual markers is adjusted with
adjustment screws on sequence valve body. Because
excessive folding speed may damage markers, adjust
markers to a safe folding speed according to “Marker
Speed” on page 147.
Note: To get both markers in the lowered position at the
same time, activate hydraulic lever to lower one
marker. After marker is lowered, move lever to
opposite position then quickly reverse lever and
hold until other marker is lowered.