Great Plains 4000TT Operator Manual - Manual (Page 26)

22 1200-4000TT Great Plains Manufacturing, Inc.
586-201M 02/11/2014
General Operation and In-Field
Adjustments
24. Remove the transport pins, see “Transport Locks”
on page 20 and unfold machine. Make sure the fold
cylinders are fully extended to allow the wings to fully
flex in the field.
25. Set the hydraulic down pressure using the instruc-
tions, see “Bypass Valve Adjustments” on
page 25.
Never leave tractor valve centered when unfolded with
machine in motion. Machine damage may occur when wings
flex. The hydraulic down pressure cylinders have no wing flex
capability and oil flow is required when the wings flex up or
down. You must have the tractor fold hydraulic lever in contin-
uous downward flow or “float” position before the wings can
flex over terrain in the raised or lower lift position.
26. If possible have someone observe the machine dur-
ing first time operation for levelness—front to rear
and wings to center frame. Adjust each as needed.
For front to rear, either extend or shorten the length
of the turnbuckle on the self-leveling system. Never
run the machine with the back lower (deeper) than
the front. To adjust the machine from side to side,
use the lift turnbuckle on each wing
27. For best results, if at all possible, run the machine at
a slight angle to the rows. This will improve trash flow
and help spread the residue more evenly throughout
the field.
Depth Stop
Refer to Figure 14
28. When you have machine level and set to the desired
working depth, set the depth stop on the depth
stop tube . This is located at the front of the
machine. This will maintain a constant depth each
time after raising and lowering machine.One full turn
of the handle
will change the depth approximately
1/4”.
Note: Slight tire to ground pressure should be maintained
to prevent cylinder pin and clevis wear. If after set-
ting the depth stop, the detent on the tractor kicks
out before the stop contacts the button
on the
depth stop, slow the hydraulic flow speed down. If
this problem exists, contact the factory service rep-
resentative for other possible adjustments. On trac-
tors with a timed detent setting, set the detent so
when you raise the machine, the pump will run for
1/2 to 1 full second after full raise. If it runs longer
than this, damage to the seals of the lift cylinders
may result.
3
4
1
2
Figure 14
Depth Stop Adjustment
42070
1
2
3
4