Great Plains YP4425A Operator Manual User Manual
Page 92
88
YP4425A
Great Plains Manufacturing, Inc.
401-805M
2012-02-23
Skips and
Bare Spots
After Turns
Fan was turned off at turns
Leave fan running. Meter Pressurization must be maintained
during turns, or seed will fall out of disc pockets.
Insufficient hydraulic flow to keep
fan running at speed required to
maintain meter pressurization
Check tractor capability against requirements (page 134).
If sufficient:
• Fold markers before engaging lift.
• Use a less aggressive lift rate.
• Monitor fan rpm during end-of-pass operations.
Unable to
adjust air
pressure low
enough.
Lower limit reached in
DICKEY-john
®
software.
At User Level 2, reduce the controlled air lower limit in the
software.
Fan speed too high, vane rotated
to maximum.
Reduce the fan speed.
Seed too
shallow or
scattered on
ground from a
single row
Bottom of seed tube damaged.
Replace seed tube. Avoid setting planter straight down. Use
forward motion when lowering.
Row not penetrating in tire tracks. Increase down force on parallel arm springs.
Opener depth too shallow.
Change side depth wheel setting.
System is
unable to
automatically
control air
meter
pressure.
Signal from air pressure sensor
lost. (failed sensor or wiring)
Air pressure may be controlled manually, consult
DICKEY-john
®
Planter/Drill Control manual, User Level 2/3.
Population Related
Problem
Cause
Solution
Seed Delivery Troubleshooting
Problem
Cause
Solution
Single row doesn’t fill or keep up with
other rows.
Y tube is bent/angled off feed
pipe.
Loosen pipe and spin so the bend is
straight down and Y-tube is not
pointing to front or rear of air pipe.
Drop tube to meter is too long,
causing seed to pool and plug
hose or Y-tube.
Shorten hose (with planter raised, but
row units lowered, to ensure hose is
not too short).
Both rows on one meter outlet low or
not keeping up with other rows.
Blockage in air slot in top of
airbox.
Clear by using a long skinny tool and
taking hose off through hose outlet.
It may be necessary to take top off
airbox or use side access doors to
clear junk from slot.
Bad hose routing between
delivery hose and airbox on wing.
Correct hose routing.
Multiple rows fail for lack of seed.
Fan speed too high/too low.
Check/adjust fan speed.
Out of seed.
Add seed.