Adjusting fold cylinders – Great Plains 3N-4025P Operator Manual User Manual
Page 20
3N-4010P, 3N-4015P, 3N-4020P and
3N-4025P
196-286M
4/23/2010
18
Bleeding Marker Hydraulics
To fold properly, the marker hydraulics must be
free of air. If the markers fold in jerky, uneven mo-
tions, follow these steps.
You may be injured if hit by a folding or unfolding
marker. Markers may fall quickly and unexpectedly if
the hydraulics fail. Never allow anyone near the drill
when folding or unfolding the markers.
Check that tractor hydraulic reservoir is full.
1.
With both markers lowered into field position,
loosen hydraulic-hose fittings at rod and base
ends of marker cylinders. If applicable, loosen
fittings on back side of sequence valve.
Never bleed an O-ring fitting. Instead, bleed a nearby
pipe or JIC fitting.
2.
With tractor idling, activate tractor hydraulic
valve until oil seeps out around a loosened fit-
ting. Tighten that fitting.
JIC fittings do not require high torque. JIC and O-
ring fittings do not require sealant. Always use liquid
pipe sealant when adding or replacing pipe-thread
fittings. To avoid cracking hydraulic fittings from over
tightening, do not use plastic sealant tape.
3.
Reactivate tractor hydraulic valve until oil
seeps out around another loosened fitting.
Tighten that fitting. Repeat process until all
loosened fittings have been bled and tight-
ened.
Adjusting Fold Cylinders
Refer to Figure 4
If the drill does not fold or unfold fully it may be
necessary to add or remove shims from the base
of the wing fold cylinder.
1.
With the drill in the folded or unfolded position
make sure drill is on level ground and all safe-
ty locks are in place.
2.
Place tractor in park, turn off ignition and re-
move ignition key.
3.
Remove bolts from cylinder base plate and
add or remove shims as necessary.
4.
Tighten fold cylinder base bolts and activate
fold cylinders to make sure wings travel to full
open and full closed position. If not repeat
above steps until full open and full closed are
achieved.
Shims
Figure 4
Fold Cylinder Shims
20339
Bolts
Base Plate