Great Plains CP1000 Assembly Instructions - Manual (Page 12)

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Section 2 Operating Instructions
CPH and CP1000 Coulter Command System 148-258M-B 9/21/05
Great Plains Mfg., Inc.
The Coulter Command couples a microprocessor with
electro-hydraulics to provide a state-of-the-art system
for maintaining coulter depth regardless of the terrain or
soil type. It also provides coulter depth adjustment
"From The Tractor Cab". A manual feature allows manu-
al control of the front hydraulic tongue cylinder for
hitching, unhitching, or making adjustments. To under-
stand the Coulter Command system, one must be
familiar with the functions of the hydraulics and the elec-
tronic controls.
Load Sensing Hydraulics
To operate Coulter Command, some tractors with load-
sensing or constant-flow hydraulics require a bypass
valve, Great Plains part number 810-400C. Contact your
Great Plains dealer to order the bypass valve.
After installing the bypass valve, set valve as follows:
Refer to Figure 8
1. Close bypass valve for no oil flow by turning knob (1)
on valve clockwise.
Figure 8
Bypass Valve
2. Adjust flow-control valve for tractor to a maximum of
10 gpm. If you do not have a flowmeter, hook a stan-
dard 8-inch stroke, 4-inch bore cylinder to the circuit.
At 10 gpm, the cylinder will take about 2.6 seconds
to extend.
3. Engage tractor hydraulics for Coulter Command.
4. Using a pressure gauge, turn knob on bypass valve
counterclockwise until pressure gauges reads 1800
psi. Lock bypass valve at this setting.
Hydraulic Hook-Up & Function
Tractors with closed-center hydraulic systems and
variable displacement hydraulic pumps.
NOTE: Failure to install a bypass valve on load-sens-
ing tractors may cause major tractor damage. Consult
your tractor dealer to verify if the bypass valve is need-
ed.
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(If you are not familiar with your tractor's hydraulics, con-
sult your tractor dealer.)
For tractors with closed-center hydraulics or pressure/
flow compensated hydraulics which are powered by a
variable displacement hydraulic pump, turn the knurled
control knob on the left side of the hydraulic valve com-
pletely clockwise and lock it in place with the circular lock
disk. Do not apply any torque to the control knob after it
bottoms out or valve damage may occur. Be sure the
lock disk is snugged to prevent the control knob from vi-
brating loose in field operation.
The tongue cylinder hydraulic circuit consists of the hos-
es from ports "P" and "T". Once the hydraulic valve is set
for CLOSED CENTER operation, the Coulter Command
tongue cylinder circuit requires live hydraulic power sup-
plied to the port labeled "P". This is accomplished by
pushing FORWARD on the tractor remote hydraulic le-
ver and LOCKING IT OPEN in this position.
•
On John Deere tractors equipped with SOUND-
GUARD R Body you must use the LEVER LOCK CLIP
John Deere Part No. R52667 to lock the lever in the
forward position. See your tractor dealer for purchase
and installation of this clip.
•
On John Deere 7000 Series tractors, rotate valve de-
tent selector to MOTOR POSITION to lock the lever in
the forward position.
•
On Case-IH Magnum tractors use the circuit designed
for HYDRAULIC MOTOR CONTROL and lock the le-
ver forward in the detent position. The detent pressure
will probably have to be turned up to its maximum set-
ting. DO NOT tie the hydraulic lever on past the detent
position with a strap. This could shift the spool beyond
its designed operating position and cause system
damage. See your tractor dealer for hydraulic system
details.
•
On other model tractors use the circuit designed for
HYDRAULIC MOTOR CONTROL and lock the lever
forward in the detent position. The detent pressure will
probably have to be turned up to its maximum setting
or some other mechanical detent holder will have to be
used to hold the lever forward. See your tractor dealer
for the proper means of providing constant pressure/
flow to the tongue cylinder circuit.
The Coulter Command hydraulic circuit requires a flow
rate of 8 to 12 gallons per minute for efficient operation.
On high flow rate tractors, the flow control on the tractor
remote may have to be turned down so as not to exceed
12 gallons per minute. Flow rates higher than 12 gallons
per minute will not damage the valve, but may cause
poor Coulter Command performance.
The remote tractor hydraulic lever will have to be locked
in position to supply oil to the "P" port of the hydraulic
control valve, regardless of whether you want to control
the tongue hydraulic cylinder manually or automatically.
Section 2
Operating Instructions