Great Plains NTA2007HD Operator Manual - Manual (Page 104)

100 Great Plains Manufacturing, Inc. Contents Index NTA607/2007HD
166-283M Contents Index 04/04/2011
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 153.
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 106).
Excess slack Adjust chain slack (page 106)
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