Great Plains 3N-4020 Operator Manual - Manual (Page 37)

Great Plains Manufacturing, Inc. Table of Contents Index Operating Instructions 33
2013-10-29 Table of Contents Index 196-359M
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 107.
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 adjust-
ment screws on sequence valve body. Because exces-
sive folding speed may damage markers, adjust markers
to a safe folding speed according to “Marker Speed” on
page 107.
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.
Shaft Monitor Operation (Option)
Refer to Figure 33
To operate the optional shaft monitor, turn the system on
via the ON-OFF
switch.
During normal movement, the indicator lamps for each
section are on steady, indicating that shaft rotation is
detected.
If the seed-cup shaft stops for 30 seconds or more, an
alarm
sounds and the lamp for the affected section
flashes.
The 30-second delay is to prevent nuisance alarms when
turning at the end of passes.
If a shaft failure does occur, remember that you have
traveled for 30 seconds without planting under the
affected section.
For installation, see:
“Shaft Monitor (Option)” on page 18.
For ordering information, see:
“Shaft Monitor” on page 121.
Figure 33
Shaft Monitor Console
18943
1
3
2
1
2
3