Lift lock troubleshooting – Great Plains NTA2007 Operator Manual User Manual
Page 109
Great Plains Manufacturing, Inc.
Troubleshooting
105
2012-01-05
166-372M
Lift Lock Troubleshooting
Front of openers
dropping too low in
hard or minimum-till
conditions
Coulters set too deep
Raise opener frame (page 86).
Pressure gauges show
pressure when
openers are raised
Hydraulic hoses not routed correctly
between pressure control valves and opener
lift cylinders.
See hose routing diagrams beginning on
page 158.
Hydraulic marker
functioning improperly
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.
Marker disc does not
mark
Marker counterbalance spring set too high,
and not allowing disc to drop into field
depressions (or mark on flat ground at
extreme spring settings)
Reduce counterbalance spring force.
Disc orientation not ideal for conditions
Reverse marker disc to pull or throw dirt.
Chain Skipping or
Excess Wear
Debris/no retainer clip
Be sure retainer clip is facing in opposite
direction of chain travel (page 111).
Excess slack
Adjust chain slack (page 111)
Sprockets not aligned
Adjust sprockets on shafts.
Problem
Causes
Solutions
Pawl Engaged After
Unfold
Lock cylinder not retracted.
Perform an unfold operation (page 36) to
retract lock cylinder.
Pawl held by lift lug.
Perform a lift operation (page 41) to move
lug and free pawl.
Pilot-operated check valve not activated.
1.
Extend Lift circuit.
2.
Extend Fold circuit.
3.
Temporarily increase pressure in both
down-pressure and weight transfer
circuits.
Implement Lowered
After Folding; Pawl Not
Engaged
Implement was not fully raised prior to
lowering
Problem
Causes
Solutions