Great Plains YP1220 Operator Manual - Manual (Page 57)

Great Plains Manufacturing, Inc. Troubleshooting 53
03/14/2012 401-506M
Hydraulic
marker
functioning
improperly Air or oil leaks in hose fittings or con-
nections. 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 plugged. Open needle valve, cycle markers slowly and reset needle
valve, refer to page 41.
Needle valve(s) in sequence valve
plugged. Open needle valves, cycle markers slowly and reset needle
valves, refer to page 41.
Marker disk
does not
mark Marker folding linkage does not have
enough slack to allow marker disk 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 41.
Reverse marker disk to pull or throw dirt.
Planter does
not fold or
unfold fully Fold cylinders out of phase. Re-phase cylinders, refer to page 32
Bleed fold circuit, refer to page 17
Problem Cause Solution