Great Plains CTA4000 Operator Manual - Manual (Page 13)

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Section 1 Preparation and Setup
2/1/06 CTA4000 Air Drill Implement 160-269M
Great Plains Mfg., Inc.
Load Sensing Hydraulics
To operate the CTA4000, some tractors with load-sensing
or constant-flow hydraulics need a bypass valve, Great
Plains part number 810-400C. Contact your Great Plains
dealer to order the valve.
After installing the bypass valve, set the valve as follows:
1. Close bypass valve for no oil flow by turning knob (1)
on valve. See Figure 1-5.
Figure 1-5
Bypass Valve
2. On tractor, adjust flow-control valve so openers raise
and lower at a reasonable speed.
NOTE: The faster openers raise and lower, the greater po-
tential for oil heating, premature wear or tractor damage.
3. Engage tractor hydraulics for fan and opener-lift-and-
fold circuits. Lock hydraulic levers for continuous oil
flow. Make sure cart fan is operating at normal speed
(about 3600 rpms).
IMPORTANT: Failure to install the bypass valve may
cause major tractor damage. Contact your tractor deal-
er to verify if the bypass valve is needed.
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4. Adjust pressure-control valves (1) on implement so
gauges (2) read 1200 psi. See Figure 1-6.
Figure 1-6
Pressure-Control Valves
5. While watching opener gauges, slowly adjust bypass
valve just until needles on gauges move down from
1200 psi. Lock bypass valve at this setting.
6. Adjust pressure-control valves to desired opener
down pressure as explained under Opener Down
Pressure, Adjustments, page 19.
IMPORTANT: Do not adjust weight-transfer valve (3) at
this time. To avoid implement damage, never set
weight-transfer valve (3) above 800 psi.
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