Great Plains NTA2007 Operator Manual - Manual (Page 124)

120 NTA607 or NTA2007 Table of Contents Index Great Plains Manufacturing, Inc.
166-372M Table of Contents Index 2012-01-05
Bleeding Lift Hydraulics
Move the drill to a hard surface area, so that the
implement cannot fully lower.
If the systems have sufficient fluid for safe operation,
prior to bleeding, perform an unfold (page 35). Leave the
implement raised.
1. Review safety advice and operational advice on
page 119, and on this page, before performing
bleed.
Note: A complete Lift system re-charge requires about
10 litres (2.6 gallons) of oil.
Refer to Figure 99 and Figure 100
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 centre section lift
cylinders
, and both wing gauge wheel lift
cylinders .
6. Orient the lift cylinder rod ends so that they are
pointing 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.
Figure 99
Master Lift Cylinders
31226
1
2
1
2
1
2
Figure 100
Slave (Wing) Lift Cylinder
31228
3
2
3