Great Plains YP4425A Operator Manual User Manual
Page 96
92
YP4425A
Great Plains Manufacturing, Inc.
401-805M
2012-02-23
Hydraulic
marker
functioning
improperly,
or not at all
Marker/Fold switch set to Fold.
CFM Switch must be set to “Marker”. Set tractor remote
circuit to Neutral or Float before operating switch.
Marker/Aux valve set to Aux
On a planter with optional Auxiliary Hydraulics, selector valve
must be set to Marker for markers to function. Set tractor
remote circuit to Neutral or Float before changing valve.
Air or oil leaks in hose fittings or
connections.
Check all hose fittings and connections for air or oil leaks.
Low tractor hydraulic oil level.
Check tractor hydraulic oil level.
Loose or missing bolts or fasteners.
Check all bolts and fasteners.
Needle valve(s) in sequence valve
plugged.
Open needle valves, cycle markers slowly and reset needle
valves, refer to page 149.
Marker disc
does not
mark
Marker folding linkage does not have
enough slack to allow marker disc to
drop into field depressions.
Maximum down float should be limited by the slot at the rod
end of the marker cylinder, refer to page 150.
Reverse marker disc to pull or throw dirt.
Auxiliary
Hydraulics
Inoperative
Marker/Fold switch set to Fold
CFM Switch must be set to “Marker” for Aux to function. Set
tractor remote circuit to Neutral or Float before switching.
Marker/Aux valve set to Marker
Selector valve must be set to Aux. Set tractor remote circuit
to Neutral or Float before changing valve.
Hydraulic
Hitch Won’t
Stay Raised
Bypass valve is open at hitch
Close valve.
Speed
Reading
Doesn’t
Match
Tractor
Monitor speed reading will only
match tractor with planter lowered
If speeds don’t agree during planting (with planter lowered),
re-calibrate radar speed sensor with planter lowered. See
page 151.
General Troubleshooting
Problem
Cause
Solution