Great Plains NTA2007HD Operator Manual - Manual (Page 119)

Great Plains Manufacturing, Inc. Contents Index Maintenance and Lubrication 115
04/04/2011 Contents Index 166-283M
Bleeding Lift Hydraulics
Move the drill to a hard surface area, so that the imple-
ment cannot fully lower.
If the systems have sufficient fluid for safe operation,
prior to bleeding, perform an unfold (page 30). Leave the
implement raised.
1. Review safety advisories and operational advice on
page 114, and on this page, before performing
bleed.
Note: A complete Lift system re-charge requires about
10 liters (2.6 gallons) of oil.
Refer to Figure 100 and Figure 101
2.
Record the number of spacers on the rods of each
Master cylinder . Remove and save the spacers (to
prevent the cylinders from resting on the spacers).
3. Lower the implement.
If the lift cylinders bottom-out on the rod ends, it will
be necessary to use jacks or stands under the tool
bar. Raise the implement. Lower it on the supports.
4. Set the Lift circuit to Float. Shut off tractor. Remove
key.
5. Unpin the rod ends of both center section lift
cylinders
, and both wing gauge wheel lift
cylinders .
6. Orient the lift cylinder rod ends so that they are point-
ing up (at least slightly above horizontal) and cannot
strike drill parts at full extension. Fully extend the lift
cylinders. Hold for several seconds.
7. Retract cylinders to their starting position. Set circuit
to Float. Re-connect rod ends. Re-install spacers.
Null4:
Figure 100
Master Lift Cylinders
31226
1
2
1
2
1
2
Null4:
Figure 101
Slave (Wing) Lift Cylinder
31228
3
2
3