Great Plains 7552 Series VII Operator Manual User Manual
Page 103
Section 5: Operating and Maintenance
1/19/2006
Series VII 6326-7552 Discovator 550-221M
99
2. Set the wings to match the depth of the
center. This is done by adjusting the lift
cylinder eyebolt on each wing (see Figure 2).
Lengthen the bolt to run shallower, shorten
the bolt to run deeper.
Figure 2
In some conditions the wings will need to be
set slightly lower than the center as the center
may tend to run deeper behind the tractor
tires.
3. Calibrate the depth gauge pointer by
extending the ratchet jack or cylinder until the
under frame clearance of the 20” blades is 4
½ (see Figure 3). Place the decal on the
stand with the pointer at ‘0’.
Figure 3
4. Adjust the disc or coulter gangs to run ½” to 1”
shallower than the cultivator sweeps by using
mechanical stops on the two inside gang
cylinders or by changing the ratchet jack
length. The pointer on the gauge should read
+1/2” to +1”. Running the disc gangs slightly
above the sweeps allows the sweeps to work
in firm ground which improves trash flow and
incorporation as well as leaving a smoother,
more level seed bed (see Figure 4).
Figure 4
5. DO NOT run the disc or coulter gangs in the
Red Zone. Running the disc gangs too deep
will cause plugging of trash as well as
excessive wear on the gangs, gang springs
and Discovator frame. Running disc gangs
too deep may also tend to hold the front of the
entire machine out of the ground. (The disc
gangs should only be run in the Red Zone
when using 18” blades that are nearing the
end of their wear life).
6. You are ready to operate the machine in the
field at this point. You should have someone
observe the machine during operation for
levelness, front to rear and side to side.
When you lower the machine to the desired
working depth, set the cylinder depth stop at
the front of the unit to maintain a constant
depth after raising and lowering.
7. Make any fine tuning adjustments on the
leveling of the machine.