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102
Great Plains Manufacturing, Inc.
NTA607/2007HD
166-283M
04/09/2019
Lift Lock Troubleshooting
Null4:
Front of openers drop-
ping too low in hard or
minimum-till condi-
tions
Coulters set too deep
Raise opener frame (page 81).
Pressure gauges show
pressure when open-
ers are raised
Hydraulic hoses not routed correctly
between pressure control valves and opener
lift cylinders.
See hose routing diagrams beginning on
page 155.
Hydraulic marker func-
tioning improperly
Air or oil leaks in hose fittings or connec-
tions.
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 disk does not
mark
Marker counterbalance spring set too high,
and not allowing disk to drop into field
depressions (or mark on flat ground at
extreme spring settings)
Reduce counterbalance spring force.
Disk orientation not ideal for conditions
Reverse marker disk 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 108).
Excess slack
Adjust chain slack (page 108)
Sprockets not aligned
Adjust sprockets on shafts.
Problem
Causes
Solutions
Pawl Engaged After
Unfold
Lock cylinder not retracted.
Perform an unfold operation (page 31) to
retract lock cylinder.
Pawl held by lift lug.
Perform a lift operation (page 37) to move
lug and free pawl.
Pilot-operated check valve not activated.
1. Close fan shut-off valve.
2. Extend Lift circuit.
3. Extend Fold circuit.
4. Temporarily increase pressure in both
down-pressure and weight transfer cir-
cuits.
Implement Lowered
After Folding; Pawl Not
Engaged
Implement was not fully raised prior to lower-
ing
Problem
Causes
Solutions