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

22 1200-4000TC Table of Contents Index Great Plains Manufacturing, Inc.
586-239M Table of Contents Index 08/01/2012
General Operation and In-Field Adjust-
ments
24. Remove the transport pins, see “Transport Locks” on
page 20 and unfold machine. Make sure the fold cylin-
ders are fully extended to allow the wings to fully flex in
the field.
25. Set the hydraulic down pressure using the instructions,
see “Bypass Valve Adjustments” on page 24.
Never leave tractor valve centered when unfolded with machine in
motion. Machine damage may occur when wings flex. The hydrau-
lic 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 continuous 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 during
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 turn-
buckle 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 turn-
buckle 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 13
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 setting
the depth stop, the detent on the tractor kicks out be-
fore the stop contacts the button
on the depth stop,
slow the hydraulic flow speed down. If this problem
exists, contact the factory service representative for
other possible adjustments. On tractors 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 af-
ter full raise. If it runs longer than this, damage to the
seals of the lift cylinders may result.
1
2
3
Figure 13
Depth Stop Adjustment
42070
4
1
2
3
4