Great Plains CP1000 Assembly Instructions - Manual (Page 17)

15
Section 3 Troubleshooting
9/21/05 CPH and CP1000 Coulter Command System 148-258M-B
Great Plains Mfg., Inc.
Depth sensing gauge wheel
not lowering to the ground
when Center Pivot Hitch is low-
ered, or depth sensing gauge
wheel cylinder not fully extend-
ing when the machine is low-
ered. The lift switch has become disconnected or
the lift switch cam on the right transport lift
cylinder has been damaged. Inspect and adjust the lift switch and push
rod cam. See "Lift Switch" under Section
2 "Operating Instructions" on page 12.
Check cable connection on lift switch lead.
Relief valve "M3" is set too low. Turn valve adjustment screw on top of
valve "M3" one eighth turn clockwise. Valve
"M3" is preset to relieve at 600 psi. Turning
the adjustment screw one eighth turn
clockwise increases the relief setting by
approximately 75 psi.
!
CAUTION!
Any attempt to set valve "M3" above 1200
psi could result in system malfunction. Set-
ting the valve "M3" above 750 psi will slow
down the lift cycle time.
Coulter depth erratic or will not
adjust when you turn the
"DEPTH CONTROL" dial. Moisture present in the master control
box. The master control box in the tractor
must be kept dry. Moisture on the circuit
board or in the control terminals will
cause false readings.
Hydraulic flow rates of more than 12
gallons per minute to the hydraulic con-
trol valve when operating in the
CLOSED-CENTER mode. Turn down the flow rate on the tractor
remote which is providing oil to the
tongue hydraulic circuit.
Inconsistent 12-volt power supply. Connect the power cord directly to the
battery. The Coulter Command electri-
cal circuit must have a good uninter-
rupted power supply. Fluctuations in
the power supply will cause inconsis-
tent electrical readings.
System generating excess
heat when operating in the
OPEN CENTER MODE. The OPEN CENTER - CLOSED CEN-
TER control knob is not turned
completely counterclockwise. Turn the knurled control knob on the left
side of the hydraulic valve completely
counterclockwise and lock it in place
with the circular lock disk.
Ball style quick couplers may produce
more heat when circulating continuous
hydraulic flow through them. Use poppet style male quick couplers.
For tractors with Pioneer quick couplers
use Pioneer 8010-4P poppet style male
couplers when operating in the OPEN
CENTER mode. See Figure 8, page
10.
Problem Possible Cause Solution