Field operation, Re-phasing cylinders – Great Plains 606NT Operator Manual User Manual
Page 29
Great Plains Manufacturing, Inc.
Operation Instructions
25
2014-02-10
151-061M
Field Operation
1.
Hitch drill to a suitable tractor (page 14).
For model 3P605NT or 3P606NT, continue at step 5.
2.
Raise drill. Hold at raised for several seconds to
re-phase lift cylinders. Set circuit to Neutral. Shut off
tractor.
Refer to Figure 16 page 22 and Figure 15 on page 22
3.
Remove transport lock channels from cylinder rods.
Move them to storage and re-pin. See page 22.
Refer to Figure 20
4.
Engage drive with lock-out hub on the left gauge
wheel. Pull pin
away from hub. Rotate 90
°.
Release into deeper notch pair.
Note: Pin may not seat fully immediately, but will at next
drill movement.
5.
Set seed population per rate chart and calibration,
from Seed Rate manual.
6.
Load box with clean seed.
7.
Raise drill. Using calibration crank
a
or 3-point gauge
gauge wheel, operate the meter drive system. Check
that feed cups, seed tubes and drives are working
properly and free from foreign material by looking for
seed flow under each opener.
8.
Lower drill. With a 3-point model, set hitch to Float.
9.
Pull forward. Stop. Check tool bar height and opener
depth.
10. Begin seeding.
11. Always lift drill out of the ground when turning at row
ends and for other short-radius turns. Seeding stops
automatically as drill is raised.
Re-Phasing Cylinders
The lift cylinders may, after a period of time, get out of
time or phase. The effects of this can be seen when one
side of the drill is running too low or too high because its
lift cylinder is either over extended or not retracted
compared to the other lift cylinder.
To re-phase the cylinders, raise drill completely and hold
tractor hydraulic lever on for a few seconds to give
cylinders time to re-phase.
Each time drill is raised out of ground momentarily
reverse hydraulic lever immediately after re-phasing to
allow cylinders to retract about
1
⁄
2
in. (2.5 cm). This helps
maintain a level drill.
Note: Having cylinders become gradually out of time is
different than having air trapped in the system, a
problem remedied by bleeding (page 46).
a. A calibration crank kit (page 53) is available for drills manufactured prior to 2005-10-01.
Machine Damage Risk:
Never back up with openers in the ground. Seed tube and
firmer damage is likely. Seed tube plugging is almost certain.
Always raise the drill when stopped and prior to reversing.
Figure 20
Lock-Out Hub Engaged
18480
5
5
To T
ractor
Figure 21
605NT or 606NT Lift Hydraulics
18676