Great Plains CTA4000 Operator Manual - Manual (Page 23)

21
Section 3 Adjustments
2/1/06 CTA4000 Air Drill Implement 160-269M
Great Plains Mfg., Inc.
NOTE: Opener down pressure controls soil-firming pres-
sure on press wheel. Use press-wheel adjustments to reg-
ulate seeding depth and opener down pressure
adjustments to control opener penetration and soil firming.
Individual Opener Height
You may need to lower an opener which runs in a tire track.
To lower individual openers, move opener-pivot bolt to
lower hole in opener mount. See Figure 3-4.
Figure 3-4
Individual Opener Height
Opener Frame Adjustment
You can adjust opener frames between two operating
positions–one for normal opener down pressure and one
for higher down pressure. The adjustment is near opener-
frame pivots. See Figure 3-5. There are three holes and
two bolts. The bottom bolt (1) serves as the pivot. The top
bolt (2) is for adjustment.
For normal drilling conditions, keep the top bolt in second
hole as shown in Figure 3-5. Use this setting when drilling
with opener down pressure below 1200 psi.
When drilling with opener down pressure above 1200 psi,
place top bolt in top hole on all eight pivot points across
implement.
Figure 3-5
Opener Frame Adjustment
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17157
1
2
Electric Clutch Switch Adjustment
To adjust height at which seed metering and weight trans-
fer are turned off, follow these steps.
1. Locate height switch. See Figure 3-6.
Figure 3-6
Electric Clutch Switch
2. Lower openers to a height where seeding should start
(usually just above ground). Securely support opener
frames at this height with jack stands or blocks.
3. Turn off tractor and remove key.
4. Refer to Figure 3-7. Loosen cam clamp (1) on pivot
retainer and turn until switch roller (2) is just starting to
make contact with ramp surface.
Figure 3-7
Electric Clutch Switch Adjustment
NOTE: Be sure cam clamp is situated so worm clamp will
not be caught on switch roller.
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17197