Great Plains YP1625 Operator Manual - Manual (Page 29)

7/12/2005 401-182M
27 Operating Instructions
Row-Unit Operation
IMPORTANT: Do not back up with row-units in
the ground. To do so will cause severe dam-
age and row-unit plugging.
For information on row-unit adjustments, refer to
“Row-Unit Adjustments,” page 33. For more infor-
mation on troubleshooting row-unit problems, see
“Troubleshooting”, page 54.
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 15.
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 46.
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 46.
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 the other marker is lowered.