Great Plains CTA4000 Operator Manual - Manual (Page 27)

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Section 4 Troubleshooting
2/1/06 CTA4000 Air Drill Implement 160-269M
Great Plains Mfg., Inc.
Fan not operating. Check that hydraulic connections are correct. Refer to Hydraulic Hose
Hookup, “Preparation and Setup,” in your cart operator’s manual and Hydrau-
lic Hose Hookup, “Preparation and Setup,” page 10.
Check direction you are engaging hydraulic lever; reverse if necessary.
Excessive seed cracking Reduce fan speed.
Openers drilling too deep Reduce hydraulic down pressure on openers. Refer to Opener Down Pressure,
“Adjustments,” page 19
Check press-wheel adjustment. Refer to Press Wheel Adjustment, “Adjust-
ments,” page 20.
Front of openers dropping too low in
hard or minimum-till conditions Set opener-frame bolt in top hole. See Opener Frame Adjustments, “Adjust-
ments,” page 21.
Opener hydraulic down pressure set too high. Refer to Opener Down Pres-
sure, “Adjustments,” page 19.
Openers raise when tractor hydraulic
lever is held forward and lower when
the lever is held back Reverse the hydraulic hoses at the tractor quick couplers.
Opener frames do not float over
uneven terrain Tractor hydraulic lever not locked forward on the circuit designed for hydraulic
motor control. See Opener Operation, “Operating Instructions,” page 15.
Pressure gauges read zero when the
openers are lowered and the tractor
remote hydraulic lever is held forward. Hoses are routed incorrectly between pressure-control valve and opener-lift
cylinders. See hydraulic-hose-routing diagrams in “Appendix,” page 31.
Pressure gauges show pressure when
the openers are raised. Hoses are routed incorrectly between pressure-control valve and opener-lift
cylinders. See hydraulic-hose-routing diagrams in “Appendix,”.page 31.
Reading on opener-down-pressure
gauge increases slightly after returning
the hydraulic lever to neutral. Ignore this apparent increase. Actual operating pressure is maintained at
pressure you selected. You can re-activate lever to confirm this.This apparent
increase is caused by back pressure on opener-lift cylinders.
Openers will raise but provide no down
pressure, or openers will not raise but
provide down pressure. Check hydraulic circuit; one supply hose is switched with return line at rear of
cart or tractor.
Problem Possible Solutions