Great Plains 3N-4025P Operator Manual - Manual (Page 29)

4/23/2010 196-286M
27 Operating Instructions
Marker Operation
Optional markers are available through your
Great Plains dealer.
Before operating markers, make sure they are
properly bled as described in “Bleeding the Hy-
draulics”, page 17.
To operate a single marker, activate tractor re-
mote 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 un-
der “Marker Adjustments”, page 57.
Dual markers are equipped with a sequence valve
to control lift sequence. Starting with both mark-
ers up, the sequence is:
1. Activate 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 ad-
justment screws on sequence-valve body.
Excessive folding speed can damage markers, so
adjust markers to a safe folding speed as de-
scribed under “Marker Adjustments”, page 57.
Note: To get both markers in the lowered posi-
tion 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 the other marker is
lowered.