Great Plains PD8070 Operator Manual User Manual
Page 64
60
PD8070
Great Plains Manufacturing, Inc.
401-479M
2014-07-23
Opener disks and side
gauge wheels
plugging
Adjust gap between opener disks and side gauge wheels. See “Row-Unit Opener
Adjustments” on page 49.
Planter will not lower
Check that pressure and return hoses are fully engaged in SCV outlets.
Planter frame raises
or lowers slowly
Lower tractor hydraulic pressure. Tractor operating pressure must be a minimum of
10 340 kPa (1500 psi).
Operate tractor with flow control lever in the unrestricted position. Refer to your tractor
operator’s manual.
Erratic or uneven lift
Check for air in hydraulic system. Bleed system of air if necessary.
Planter will not raise
Tractor hydraulic system bypassing oil. Readjust tractor’s hydraulic lever linkage.
Refer to your tractor operator’s manual.
Markers not
alternating
Marker hoses not connected to marker valve correctly.
Check for air in marker valve. Bleed marker hydraulic system.
Marker valve defective. Replace valve. See your Great Plains dealer.
Marker floats off
ground
Air in hydraulic system. Bleed marker lift cylinder.
Alternator valve defective. Replace valve. See your Great Plains dealer.
Check for leaks in tractor hydraulic remote.
Marker cylinder not dropping down into J-slot. (Hose loop too short.) Lengthen
marker hydraulic hose loops.
Hydraulic marker
functioning
improperly
Check all hose fittings and connections for air and oil leaks.
Check tractor hydraulic oil level.
Check all bolts and fasteners.
If markers do not alternate: check tractor flow controls and set to maximum oil flow. If
problem still exists, disassemble valve and check for contamination or spool damage.
Blade does not mark
The maximum marker down float is limited by the slot in the pivot link. If the blade
does not drop down to follow depressions in the field, make sure the marker cylinder
is fully extended.
The blade may be reversed to pull dirt in or throw dirt out depending on soil
conditions.
Problem
Possible Cause and Solution