GREAT PLAINS CPH Product manual

!Read the operator’s manual entirely. When you see this symbol, the subsequent in-
structions and warnings are serious - follow without exception. Your life and the lives of
others depend on it!
Cover illustration may show optional equipment not supplied with standard unit.
© Copyright 1999 Printed
P.O. Box 5060 ●Salina, Kansas 67402-5060
Manufacturing, Inc.
Operator’s/Parts Manual
12611
148-258M-B
Coulter Command System
CPH and CP1000
2/30/2002

0
Table of Contents
CPH and CP1000 Coulter Command System 148-258M-B 9/21/05
Great Plains Mfg., Inc.
Table of Contents
Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . 0
Important Safety Information . . . . . . . . . . . . . . . . . 1
Safety Rules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Product Overview. . . . . . . . . . . . . . . . . . . . . . . . . 2
Using This Manual . . . . . . . . . . . . . . . . . . . . . . . . 2
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Important Notice . . . . . . . . . . . . . . . . . . . . . . 2
Pre-Assembly Checklist . . . . . . . . . . . . . . . . . . . . 3
Coulter Command Assembly . . . . . . . . . . . . . . . . 3
Depth Sensing Wheel . . . . . . . . . . . . . . . . . . 3
Section 1 Assembly Instructions & Set-Up . . . . . . 3
Lift Switch Assembly . . . . . . . . . . . . . . . . . . . 4
Wiring Harness . . . . . . . . . . . . . . . . . . . . . . . 6
Tongue Cylinder. . . . . . . . . . . . . . . . . . . . . . . 7
Hydraulic Control Valve . . . . . . . . . . . . . . . . . 7
Control Box . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Coulter Command Assembly Adjustments. . . . . . 9
Section 2 Operating Instructions . . . . . . . . . . . . . 10
Load Sensing Hydraulics . . . . . . . . . . . . . . . . . . 10
Hydraulic Hook-Up & Function. . . . . . . . . . . . . . 10
Closed-center hydraulic systems . . . . . . . . 10
Open center hydraulic systems. . . . . . . . . . 11
Operation of Electronic Controls . . . . . . . . . . . . 12
Field Adjustments . . . . . . . . . . . . . . . . . . . . . . . 12
Lift Switch. . . . . . . . . . . . . . . . . . . . . . . . . . .12
Speed Sensor. . . . . . . . . . . . . . . . . . . . . . . .13
Hydraulic Valve. . . . . . . . . . . . . . . . . . . . . . .13
Transport Cylinder Depth Channels . . . . . . .13
Section 3 Troubleshooting . . . . . . . . . . . . . . . . . . .14
System Schematics . . . . . . . . . . . . . . . . . . . . . .17
Hydraulic Schematic. . . . . . . . . . . . . . . . . . .17
Electrical Schematic. . . . . . . . . . . . . . . . . . .18
Section 4 Maintenance and Lubrication . . . . . . . .19
Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Section 5 Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Coulter Depth Control Hydraulics. . . . . . . . . . . .20
Coulter Command Electronics . . . . . . . . . . . . . .22
Coulter Command Gauge Wheel Assembly. . . .24
Top Link Assembly . . . . . . . . . . . . . . . . . . . . . . .26
Coulter Command Switch Mount . . . . . . . . . . . .28
Lift Circuit Manifold (810-262C) . . . . . . . . . . . . .30
Coulter Depth Control Valve (810-214C) . . . . . .32
O-Ring Identification Chart . . . . . . . . . . . . . . . . .34
Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
Torque Values Chart for Common Bolt Sizes . . .36
Tire Inflation Chart . . . . . . . . . . . . . . . . . . . . . . .36
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

1
Important Safety Information
9/21/05 CPH and CP1000 Coulter Command System 148-258M-B
Great Plains Mfg., Inc.
Important Safety Information
For your safety and to help in developing a better under-
standing of your equipment we highly recommend that
you read the operator sections of this manual. Reading
these sections not only provides valuable training but
also familiarizes you with helpful information and its lo-
cation. The parts sections are for reference only and
don’trequirecovertocoverreading.Afterreviewingyour
manual store it in a dry, easily accessible location for fu-
ture reference.
The SAFETY ALERT SYMBOL indicates that there is a
potential hazard to personal safety involved and extra
safety precautions must be taken. When you see this
symbol, be alert and carefully read the message that fol-
lows it. In addition to design and configuration of
equipment; hazard control and accident prevention are
dependentupontheawareness,concern,prudenceand
proper training of personnel involved in the operation,
transport, maintenance and storage of equipment.
Watchforthefollowingsafetynotationsthrough-out
your Operators Manual:
!DANGER!
Indicates an imminently hazardous situation which, if
not avoided, will result in death or serious injury. This
signal word is limited to the most extreme situations.
!WARNING!
Indicates a potentially hazardous situation which, if not
avoided, could result in death or serious injury.
!CAUTION!
Indicates a potentially hazardous situation which, if not
avoided, may result in minor or moderate injury. It may also
be used to alert against unsafe practices.
Safety Rules
Most accidents are the result of negligence and care-
lessness, usually caused by failure of the operator to
follow simple but necessary safety precautions. The fol-
lowing safety precautions are suggested to help prevent
such accidents. The safe operation of any machinery is
a big concern to consumers and manufacturers.Your
Coulter Command System has been designed with
many built-in safety features. However, no one should
operate this product before carefully reading this Opera-
tor’s Manual.
!
1. Escaping fluid under pressure can have sufficient force
to penetrate the skin. Check all hydraulic lines and hoses
before applying pressure. Fluid escaping from a very
small hole can be almost invisible. Use paper or card-
board, not body parts, to check for suspected leaks. If in-
jured, seek medical assistance from a doctor that is
familiar with this type of injury. Foreign fluids in the tis-
sue must be surgically removed within a few hours or
gangrene will result.
2. Make sure all people, animals, and objects are clear of
the coulter tool bar before switching the tongue hydrau-
lics switch to the "auto" mode.
3. Do not crawl under a raised machine without the trans-
port lock blocks securely in place. Sudden hydraulic ac-
tivation or failure could cause serious injury or death.
4. Never permit anyone to ride on hitch or planting equip-
ment when moving.
5. Never permit anyone to ride tractor when hitch is being
moved.
6. Do not pull the Center Pivot Hitch faster than 20 miles
per hour.
7. Always set the hitch in field position before assembling,
lubrication, making adjustments, or servicing. Periodi-
cally check bolts for tightness and lubricate all fittings.
8. Shut off hydraulics valves and shut down tractor before
preforming any maintenance to the hitch or crawling un-
der it.
9. Do not allow anyone to operate the machine who has not
been properly trained in its safe operation.
10. Do not operate equipment while under the influence of
drugs or alcohol.
11. Keep hands, feet, hair, and clothing away from all mov-
ing parts.
12. Clear the area of bystanders, especially small children
and animals before moving and operating equipment.
Review the safety instructions annually.

2
Introduction
CPH and CP1000 Coulter Command System 148-258M-B 9/21/05
Great Plains Mfg., Inc.
Introduction
This manual applies to the following:
148-260A CPH Coulter Command
148-272A CPH Coulter Command Update
148-260A CP1000 Coulter Command
This manual has been prepared to instruct you in the
safe and efficient operation of your Coulter Command
System. Read and follow all instructions and safety pre-
cautions carefully.
Thepartson yourCoulter Commandhave beenspecial-
ly designed and should only be replaced with genuine
GreatPlains parts.Therefore,shouldyourCoulter Com-
mandrequire replacementpartsgo toyourGreat Plains
Dealer.
Product Overview
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". The Coulter Command system
contains a depth sensing wheel, an electronic control
box, a speed sensor, a depth sensor box, a lift control
switch, a wiring harness, a top link, and a hydraulic con-
trol valve. It also uses the tongue cylinder from your
Center Pivot Hitch (CPH) or CP1000.
Using This Manual
For your safety and to help in developing a better under-
standing of your equipment we highly recommend that
you read the operator sections of this manual. Reading
these sections not only provides valuable training but
also familiarizes you with helpful information and its lo-
cation. The parts sections are for reference only and
don’t require cover to cover reading. After reviewing
your manual store it in a dry, easily accessible location
for future reference.
Definitions
The right hand and left hand as used throughout this
manual is determined by facing in the direction the ma-
chine will travel when in use unless otherwise stated.
Important Notice
Great Plains Manufacturing, Inc. provides this publica-
tion “as is” without warranty of any kind, either
expressed or implied, while every precaution has been
taken in the preparation of this manual, Great Plains
Manufacturing, Inc. assumesno responsibility for errors
oromissions.Neitheris anyliabilityassumedfordamag-
es resulting from the use of the information contained
herein. Great Plains Manufacturing, Inc. reserves the
righttoreviseandimproveitsproductsasitseesfit.This
publicationdescribesthestateofthisproductatthetime
of its publication, and may not reflect the product at all
times in the future.
Printed in the United States of America.
For your convenience, record your Serial Number, Mod-
el Number and the Date Purchased in the space
provided below. Have this information before you when
calling a Great Plains Authorized Dealer.
NOTE: Indicates a special point of information
which requires your attention.

3
Section 1 Assembly Instructions & Set-Up
9/21/05 CPH and CP1000 Coulter Command System 148-258M-B
Great Plains Mfg., Inc.
Pre-Assembly Checklist
Check All major components
Fasteners that were shipped with the Coulter Command
System.
NOTE: Some of the hardware from the factory has been
installed in the location where it will be used.
Have a minimum of 2 people at hand while assembling the
Coulter Command.
Have a fork lift or loader along with chains and safety
stands ready for the assembly task.
If you are unsure where a fastener is used, use the parts
section of this manual to identify it. Be sure the part gets
used in the correct location.
Coulter Command Assembly
Depth Sensing Wheel
Refer to Figure 1
Install the coulter depth sensing wheel assembly (#1) to
the front 4" x 4" coulter tool bar tube with the 5/8" X 6"
long U-bolt (#2), lock washers (#3), and nuts (#4). The
centerofthecoulter depthsensingwheelmountbracket
should be positioned 2 1/4" to the right of the center of
the hitch center beam. This dimension leaves about 2 3/
4"clearancebetweenthe inside edge ofthe depth sens-
ing tire and the edge of the 8" X 8" hitch center beam.
12613
Section 1 Assembly Instructions & Set-Up
Figure 1
Coulter Command Assembly

4
Section 1 Assembly Instructions & Set-Up
CPH and CP1000 Coulter Command System 148-258M-B 9/21/05
Great Plains Mfg., Inc.
Lift Switch Assembly
Refer to Figure 2
1. Remove the 1/2" x 5 1/2" long bolts (#28) nuts, flat
washers, and springs from the right hand transport
cylinderbrace andinsertthe switchmount(#4),and
1/2" lock washer (#15), under the head of the bolt.
Position the mount and bolts back onto the brace
and reassemble the nuts, flat washers and springs
onto the brace. It is important that these support
braces are properly assembled to support the trans-
port cylinders without binding or placing undo side
loads on the cylinders. Whenever the 5 1/2" support
bolts are removed or the inner axle slide blocks be-
comeworn, assembleoradjust the cylindersupport
braces as follows.
a. Assemble the 1/2" x 5 1/2" long full thread bolt
(#28), 1/2" lock washer (#15), and the switch
mount (#4) to the cylinder support brace (#22)
bolted to the rod end cylinder casting.
b. Screw on three 1/2" jam nuts (#23), and one
1/2" washer (#24) as shown in . Tighten the first
jam nut against the cylinder support (#22) and
run the other two jam nuts on, nearly all the way.
c. With the cylinder properly installed, the support
bolts (#28) should extend through the bracket
(#27)on the outerslide tubewhen the baseend
and rod end pins are in place.
d. Screw the outer 1/2" jam nut out until the 1/2"
washer (#24) just touches the bracket on the
outer slide tube. Do not put pressure on the cyl-
inder by tightening the 1/2" jam nut. Once the
washer touches the bracket, lock the outer 1/2"
jam nut in place with the center 1/2" jam nut.
e. Install spring (#25) and 1/2" nylock nut (#26).
Tighten nut to compress spring to a 1 1/4"
length.
Use this procedure for each of the two support bolts
on the transport cylinders.
2. Fasten the cylinder rod clamps (#3 & 6) to the clevis
end of the cylinder rod with two 5/16" x 1 1/4" bolts
(#16),lockwashers (#18)and nuts(#19). Theoffset
of the clamp must be toward the right hand side of
the hitch as shown.
3. Withtherampofthepushrod(#5),facingtowardthe
center of the hitch, insert it between the ears of the
cylinder rod clamp (#6), and bolt it in place with a
5/16" x 1 1/4" bolt (#16), two 5/16" USS flat washers
(#17), and nylock nut (#20). It is recommended to
bolt it through the lower-most hole in the push rod.
Only run the nylock nut far enough onto the bolt to
make full engagement of the nylon collar on the nut.
Do not cinch it down. The bolt and push rod must be
free to move in the slot of the clamp.
4. Slide the switch guide block (#2), over the push rod
and fasten it to the mount with two 1/4" x 2" long
bolts (#12), flat washer (#21), lock washers (#13),
and nuts (#14).
5. Bolt the plunger activated switch (#7), to the mount
with the spacer plate (#1), under it with two #10" x
1 1/2" long round head machine screws (#8), flat
washers (#9), lock washers (#10), and nuts (#11).
Slide the plunger switch in the slots of the mount so
the plunger moves "in" about 1/8" when the cam on
the push rod activates it and tighten the screws. Do
not"bottom out" theplungeron the switch orit could
be damaged.
Wiring Harness

5
Section 1 Assembly Instructions & Set-Up
9/21/05 CPH and CP1000 Coulter Command System 148-258M-B
Great Plains Mfg., Inc.
Figure 2
Switch Assembly
12612

6
Section 1 Assembly Instructions & Set-Up
CPH and CP1000 Coulter Command System 148-258M-B 9/21/05
Great Plains Mfg., Inc.
Refer to Figure 3
1. Route the 156" long two wire lead of the wiring har-
ness(#1) throughthe 8"x8" hitchtube andto thelift
switch (#2) at the rear of the machine. Plug in the lift
switch and support the cable with the cable tie
mounts (#3) and releasable cable ties (#4) or strap
the cable to the hydraulic hoses.
2. Plugthe4-Pinconnectorofthewiringharnesstothe
sensor box on the depth sensing wheel and support
the cable with the cable tie mounts (#3) and releas-
able cable ties (#4).
3. Route the 9-Pin connector through the spring hose
loop and to the tractor hitch. This will plug into the 9-
Pin Female lead from the control box extension ca-
ble (#5).
4. The other three short leads on the wiring harness
will plug into the leads from the solenoids on the hy-
draulic control valves after they are installed.
Figure 3
Wiring Harness Assembly
12617

7
Section 1 Assembly Instructions & Set-Up
9/21/05 CPH and CP1000 Coulter Command System 148-258M-B
Great Plains Mfg., Inc.
Tongue Cylinder
Refer to Figure 4
1. Remove the stroke pointer gauge (#1) which was
bolted to the rod end of the tongue cylinder and re-
torque the cylinder tie rod bolts to 95 FT-LBS. Re-
move the stroke pointer (#2) at the cylinder rod
clevis and discard it.
Refer to Figure 5
2. Turn the tongue cylinder with the rod end pointing
forwardanddown,andwiththeports turnedup.Use
the clevis pin (#17), flat washer (#18), and 1/4" cot-
terpin (#13)to replacethe strokepointerpin atwhat
is now the base end of the cylinder. Use the existing
clevis pin (#15) and hair pin cotter (#16) to connect
the rod end to the tongue.
3. Remove the elbow fitting (#3) at the base end of the
tongue cylinder and screw the 1/16" orifice plate
(#9)intothe baseendport.Screwtheorificeplatein
far enough so it doesn't interfere with the elbow fit-
ting and replace the fitting.
IMPORTANT:Failure toinstall the orifice platewillnot al-
low coulter command to operate correctly.
Hydraulic Control Valve
Refer to Figure 5
1. Boltthe 31/2" x31/2" x5" hydraulicvalve block(#2)
to the top of the valve mount bracket (#13) with the
5/16" x 4" long bolts (#1), lock washers (#11), and
hex nuts (#10). Position the valve block so the sole-
noids set above the middle of the top surface of the
valve mount.
2. Boltthe 3"x 31/4"x 8"hydraulic valveblock(#25)to
the side of the valve mount bracket (#13) with the
5/16" x 3 1/2" long bolts (#24), lock washers (#11),
and hex nuts (#10). Position the valve block so the
four ports point away from the valve mount and the
solenoid points up.
3. Bolt the valve mount assembly to the hitch with the
1/2" x 5 1/2" long bolt (#12), lock washer (#6), and
hex nut (#5). Assemble the bolt through the pivot
tube for the level link located just behind the tongue
cylinder. Position the valve mount so the dual sole-
noids face toward the rear of the machine.
4. Assemblethe3/4"JICelbows(#3)tothevalveports
marked"P" and"T"of thetop valveblock.Assemble
the straight 3/4" adaptors (#7) to the valve ports
marked"A" and"B"of thetop valveblock. Assemble
the straight 3/4" adaptors (#7) to the valve ports
marked "V1" and V2" of the lower valve block. As-
semble the 1/2" female pipe swivel elbows (#20) to
the valve ports marked "C3" and "C4" of the lower
valve block. Assemble the 9/16" elbows (#21) to the
valveportsmarked"C1"and"C2"ofthelowerblock.
Assemble the remaining two 9/16" elbows (#21) to
the ports on the side of the 1 1/2" x 4" gauge wheel
lift cylinder (#23).
5. Remove the 122" hoses (#4) from the tongue cylin-
der and assemble them to the elbows (#3) at ports
"P" and "T" on the top hydraulic valve. Connect the
20" long hose (#8) between the port "B" of the top
valve and the tongue cylinder base end fitting. Con-
nect the 30" long hose (#14) between port "A" of the
top valve and the tongue cylinder rod end fitting. As-
semble the other two 122" hoses (#4), from the
Coulter Command kit, to the adaptors (#7) at ports
"V1" and "V2" on the lower hydraulic valve. Remove
the quick couplers from the ends of the long trans-
port lift hoses (#26) and assemble them to the ends
of the 122" hoses (#4) from ports "V1" and "V2". As-
semble the long transport lift hoses (#26) to the el-
bows (#20) at ports "C3" and "C4" on the lower
hydraulicvalve.Thehosecoming fromthebase end
of the transport lift cylinders connects to the port
marked "C3" and the hose coming form the rod end
of the transport lift cylinders connects to the port
marked "C4". Slide the excess hose from the long
transport lift hoses into the 8" x 8" hitch main tube.
Connect one of the 36" long 1/4" hoses (#22) be-
tween the port "C1" of the lower valve block and the
Figure 4
Tongue Cylinder Disassembly
12672

8
Section 1 Assembly Instructions & Set-Up
CPH and CP1000 Coulter Command System 148-258M-B 9/21/05
Great Plains Mfg., Inc.
1 1/2" x 4" gauge wheel lift cylinder base and elbow
fitting (#21). Connect the other 36" long 1/4" hose
(#22) between the port "C2" of the lower valve block
and the 1 1/2" x 4" gauge wheel lift cylinder rod end
elbow fitting (#21).
6. Route the three 16" wiring harness leads with the
weather-proof connectors, under the valve mount
and connect each lead to its solenoid. The lead la-
beled "A" should be plugged into the solenoid
marked"A",The leadlabeled "B"shouldbe plugged
into the solenoid marked "B," and the lead labeled
"S1" should be plugged into the solenoid marked
"S1."
Figure 5
Hydraulic Control Valve Assembly
13482

9
Section 1 Assembly Instructions & Set-Up
9/21/05 CPH and CP1000 Coulter Command System 148-258M-B
Great Plains Mfg., Inc.
Control Box
Refer to Figure 6
1. Mountthe controlboxata convenientlocation inthe
tractor cab. Connect the 12’ extension cable to the
9-pin connector on the back of the control box and
routethecablebacktowardthetractordrawbararea
making sure it will not get kinked or pinched.
2. Connect the power cord to a good uninterrupted 12
voltpowersource onthe tractor. Connectingdirectly
to the battery is recommended. Plug the cord into
the lead with the 2-Pin connector on the back of the
control box. The polarity of the power supply is very
important toprevent circuitdamage.Thewhite wire
of the power cord must be connected to the "+" pos-
itive battery terminal and the black wire to the "-"
negative battery terminal.
Coulter Command
Assembly Adjustments
Refer to Figure 7
Coulter command depth sensing wheel assemblies
whicharepre-assembledat thefactoryare pre-adjusted
and should not require further adjustment. If the sensor
box at the depth sensing wheel has been field installed,
or if its linkage gets out of adjustment, it must be adjust-
ed using one of the following two procedures:
1. The best and most accurate means of adjusting the
linkage inside the sensor box makes use of a volt-
meterwhichreads0-12voltsDC.TheControlBoxin
the tractor must be properly connected to a power
source and the POWER switch must be ON. The
TONGUE HYDRAULICS switch should be in the
MANUAL mode. The wiring harness must be con-
nected to the control box and the sensor box. The
depth sensing wheel should be off the ground with
the arm rotated down as far as its spring-loaded
down-pressure link will allow. Remove the cover
from the sensor box and inspect the internal linkage
for proper assembly.
Figure 6
Coulter Command Control Box
12575
With the depth sensing wheel in the max down posi-
tion, the voltage potential between the lead contain-
ing the WHITE WIRE and the ground lead (BLACK
WIRE) in the gauge wheel sensor box (#1) should
be 5 volts DC plus or minus 1/4 volt. To adjust the
gauge wheel sensor box linkage, loosen the 3/8"
hex flange nut (#2) on the sensor spindle and rotate
the circular disk (#3) until the voltage potential be-
tweentheleadcontainingtheWHITEWIREandthe
ground lead (BLACK WIRE) (#1) is 5 volts DC plus
or minus 1/4 volt. Rotating the circular disk counter-
clockwise increases voltage potential, and rotating
the circular disk clockwise decreases the voltage
potential. Once the correct voltage potential is
achieved, tighten the 3/8" nut. Be careful not to ro-
tate the circular disk as you tighten the nut. Replace
the sensor box cover.
2. The second means of adjusting the linkage inside
the sensor box involves measuring from the inside
edge of the box to the left pivot of the formed round-
bar link. The depth sensing wheel should be off the
ground and rotated down as far as its spring-loaded
down-pressure link will allow. Remove the cover
from the sensor box and inspect the internal linkage
for proper assembly.
With the depth sensing wheel in the max down posi-
tion, the pivot between the vertical flat-bar link and
the formed round-bar link should be 15/16" from the
front inside edge of the sensor box.
With the sensor box linkage properly assembled,
loosen the 3/8" hex flange nut on the sensor spindle
androtatethecirculardisk untilthepivotbetweenthe
vertical flat-bar link and the formed round-bar link is
15/16" + or - 1/16" from the front inside edge of the
box. Be careful not to rotate the circular disk as you
retighten the nut. Replace the sensor box cover.
3. Some models of the sensor box have a mark on the
vertical flat-bar link which should line up with a mark
on the link’s slotted mount plate at the correct preset
voltage. With the depth sensing wheel in the max
down position, the marks should line up at a voltage
of5voltsDC+or-1/4volt.Aligningthemarksismore
Figure 7
Sensor Box Adjustments
12619

10
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,GreatPlainspartnumber810-400C.Contactyour
Great Plains dealer to order the bypass valve.
After installing the bypass valve, set valve as follows:
Refer to Figure 8
1. Closebypassvalvefornooilflowbyturning 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-
dard8-inchstroke,4-inchborecylindertothecircuit.
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-
ingtractorsmaycausemajor tractordamage.Consult
yourtractordealer toverify ifthe bypassvalveisneed-
ed.
17987
(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-
pletelyclockwiseandlockitinplacewiththecircularlock
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-
esfromports"P"and "T".Oncethe hydraulicvalveis set
forCLOSEDCENTERoperation,the CoulterCommand
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-
GUARDRBodyyoumustusetheLEVERLOCKCLIP
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-
tentselector toMOTORPOSITION tolock thelever in
the forward position.
•OnCase-IH Magnumtractors usethecircuit designed
for HYDRAULIC MOTOR CONTROL and lock the le-
verforwardinthedetent position.Thedetentpressure
will probably have to be turned up to its maximum set-
ting.DO NOTtie thehydraulic leveronpastthedetent
positionwith astrap. This couldshift thespool 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
forwardinthedetentposition. Thedetentpressurewill
probably have to be turned up to its maximum setting
orsomeothermechanicaldetentholderwillhavetobe
usedtohold the leverforward. See yourtractordealer
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
12gallonsper minute.Flowrates higherthan12 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

11
Section 2 Operating Instructions
9/21/05 CPH and CP1000 Coulter Command System 148-258M-B
Great Plains Mfg., Inc.
The CPH transport hydraulic circuit contains the hoses
from the ports marked "V1" and "V2". This circuit must
be connected to one of the remaining circuits for raising
and lowering the transport system. This circuit must re-
ceive hydraulic pressure for raising the machine even
while the hydraulic tongue circuit is "locked in" for contin-
uoususe.Ifthemachinewillnotraisewhenthehydraulic
tongue circuit is "locked in," consult your tractor dealer.
You may need to run the transport hydraulic circuit on a
"priority circuit" and the hydraulic tongue circuit on an al-
ternate remote if the tractor hydraulics allows live
hydraulic power to other remotes. If the "priority circuit"
is the only circuit suitable for HYDRAULIC MOTOR
CONTROL, then run the transport hydraulic circuit on
the "priority circuit" and run the hydraulic tongue circuit
onan alternateremote with theCoulter Command valve
intheOPENCENTERMODE.See"Tractorswithopen
center hydraulic systems or fixed displacement hy-
draulic pumps" below.
Tractors with open center hydraulic systems or
fixed displacement hydraulic pumps.
(If you are not familiar with your tractor's hydraulics, con-
sult your tractor dealer.)
For tractors with open-center hydraulics or on tractors
with fixed displacement hydraulic pumps 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. Be sure the lock disk is
snuggedtopreventthecontrolknob fromvibratingloose
in field operation.
The CPH transport hydraulic circuit contains the hoses
from the ports marked "V1" and "V2". This circuit must
be connected to tractor's "priority circuit" to supply hy-
draulic pressure for raising the machine even while the
hydraulic tonguecircuit is"lockedin" forcontinuoususe.
The"No.1"hydrauliccircuitonmostopen-centertractors
is the priority circuit.
The tongue cylinder hydraulic circuit consists of the hos-
esfromports"P"and"T".Connect"P"and"T"toacircuit
other than the "priority circuit". Once the hydraulic valve
is set for OPEN CENTER operation, the Coulter Com-
mand tongue cylinder circuit requires live hydraulic
power supplied to the port labeled "P". This is accom-
plished by pushing FORWARD on the tractor remote
hydraulic lever and LOCKING IT OPEN in this position.
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.
The Coulter Command tongue hydraulic circuit requires
a flow rate of 8 to 12 gallons per minute for efficient op-
eration. On high flow rate tractors, turn down the flow
rate on the tractor remote, if possible, so as not to ex-
ceed 12 gallons per minute. Flow rates higher than 12
gallons per minute will increase the heat generated by
the Coulter Command circuit when it circulates this high
flow of oil.
Refer to Figure 9
Whenoperatingthe CoulterCommandtongue hydraulic
circuit in the OPEN CENTER mode, use poppet style
quick couplers on the hoses connecting to the tractor.
These quick couplers allow better flow through some
tractor remotes and may produce less heat when circu-
lating continuous hydraulic flow through them. Parker
Hannifin offers the poppet style Pioneer quick coupler in
their 8010 Series couplers. For tractors with Pioneer
quick couplers use Pioneer 8010-4P poppet style male
couplers when operating in the OPEN CENTER mode.
Figure 9
Quick Couplers
Poppet Style Ball Style 16316

12
Section 2 Operating Instructions
CPH and CP1000 Coulter Command System 148-258M-B 9/21/05
Great Plains Mfg., Inc.
Operation of Electronic Controls
1. Connect the power cord to a good uninterrupted 12
voltpowersource onthe tractor. Connectingdirectly
to the battery is recommended. Plug the cord into
the lead with the 2-Pin connector on the back of the
control box. The polarity of the power supply is very
important toprevent circuit damage.Thewhite wire
of the power cord must be connected to the "+" pos-
itive battery terminal and the black wire to the "-"
negative battery terminal.
2. With the remote tractor hydraulic lever locked in po-
sition to supply oil to the "P" port of the hydraulic
control valve, turn the power switch on.
a. Formanualtongue hydrauliccylinderoperation,
simply move UP-DOWN switch. Moving the
switch to the UP position extends the tongue
cylinder, and moving the switch to the DOWN
position retracts the tongue cylinder. If UP re-
tracts the cylinder, then your remote hydraulic
lever is not supplying oil to the "P" port of the hy-
draulic control valve, or the wires going to the
solenoids A and B are reversed. By moving the
UP-DOWN switch, the AUTO-MANUAL switch
automatically switches to the MANUAL mode. If
you are in the AUTO mode and you want to
manually hold the tongue hydraulic cylinder in
the position set by the automatic controls, just
switch the AUTO-MANUAL switch to MANUAL.
b. For automatic coulter depth control, simply
switch the AUTO-MANUAL switch to AUTO and
dial in the desired coulter depth you wish to
maintainwiththe coulter depthcontrol knob.
!WARNING!
Make sure all people, animals, and objects are clear of the
coulter tool bar before switching the tongue hydraulics
switch to the "auto" mode. Sudden automatic lowering of the
coulter tool bar could cause serious personal injury or death.
Turning the coulter depth switch clockwise makes
thecoulters run shallower. Turning thecoulter depth
switch counterclockwise makes the coulters run
deeper. If the hitch is not moving or is on a hard sur-
face,turning thecoulter depthswitchmaynotcause
thetongue cylinderto retracttothedesiredposition.
The coulters may not penetrate to the desired depth
until the hitch is moving. The coulter depth setting
can always be changed "on-the-go" if you desire.
With the AUTO-MANUAL switch in the AUTO mode,
the coulters should maintain a constant depth re-
gardless of terrain, soil type or speed. When lifting
and turning in the field, the tongue cylinder will re-
maininits last automaticallyset mid strokeposition.
When the machine is lowered, the coulters will auto-
matically return to their preset depth.
Field Adjustments
Lift Switch
The switch at the transport lift cylinder of the Center Piv-
ot Hitch determines the point in the lift cycle at which the
automatic feature of the Coulter Command will be inter-
rupted and the depth sensing gauge wheel will be lifted
offtheground for turning around. Sincethe Center Pivot
Hitch transport tires can be lowered during operation to
provideflotationforthedrillinsoftsoilconditions,coulter
command should not be interrupted and the depth sens-
ing gauge wheel should not be lifted until after the
transporttiresareloweredtothepointwheretheyareno
longerused forsystem flotation.This is usuallythe point
inthe liftcycle whenthe drill openersare justbeing lifted
out of the ground.
A 3/8" x 3/8" square ramp attached to a sliding push rod
on the right transport lift cylinder activates a plunger
switchwhichcausestheautomaticfeatureoftheCoulter
Command to be interrupted and the depth sensing
gauge wheel to be lifted off the ground for turning the
Center Pivot Hitch around in the field.

13
Section 2 Operating Instructions
9/21/05 CPH and CP1000 Coulter Command System 148-258M-B
Great Plains Mfg., Inc.
1. To adjust the lift switch timing, assemble the push rod
tothe cylinder rodclamp usingone ofthe three adjust-
ment holes at the bottom of the push rod. When tight-
ening up the 5/16" nylock nut on the pivot bolt, DO
NOT TIGHTEN IT DOWN TIGHT. The bolt and push
rod must be free to move in the slot of the clamp. It is
recommended to assemble the push rod through its
lower-most hole. BE CAREFUL NOT TO "BOTTOM
OUT" THE LIFT SWITCH PLUNGER when the plung-
er roller climbs the surface of the 3/8" square ramp.
2. To adjust the lift switch position, loosen the two #10
screws and slide it forward or backward in the slotted
switch mount holes so the plunger moves "in" only
about 1/8" when the cam activates it. DO NOT "BOT-
TOM OUT" THE LIFT SWITCH PLUNGER.
!WARNING!
Shut the tractor off and put all hydraulic valve levers in neutral
position before attempting to work on or crawl under the ma-
chine. Do not crawl under a raised machine without the trans-
port lock pins securely in place. Sudden hydraulic activation or
failure could cause serious injury or death.
Aproperly adjustedlift switchallowsthe automatic coulter
depth feature to be interrupted early in the lift cycle. This
providedthefastestlift cycletimes whenturning aroundin
thefield. Operatingthe liftswitchearly inthelift cycle,also
provides the maximum amount of time for the depth sens-
ing gauge wheel cylinder to completely extend as the
machine is lowered back to field position. It is important
thatthe depthsensinggauge wheelcylinder alwaysbe ful-
ly extended when the Center Pivot Hitch is in field position
toallowthedepth sensinggauge wheelto floatthroughits
full range of motion.
Speed Sensor
The Coulter Command depth control system automatical-
ly compensates for changes in ground speed. A speed
sensor and speed sensor plate mounted behind the
coulter depth sensing wheel monitors the ground speed
so the Coulter Command can adjust for it. This sensor
should be in close proximity to the speed sensor plate. In
general, it should never need adjustment. If the sensor
does get moved, it should be adjusted against the speed
sensor plate until is just touches the plate in the closest
part of the rotation. A bent speed sensor plate should be
straightenedor replacedimmediately.To adjustthe speed
sensor, loosen the two #6 screws on the sensor and slide
ittowardthe speedsensorplate.Rotatethedepthsensing
wheelto the positionwhere the speedsensor plate isclos-
est to the sensor mount, and retighten the sensor mount
screws where the sensor just touches the speed sensor
plate.
Hydraulic Valve
All adjustable valve cartridges on the hydraulic valve
blocks are preset at the manufacturer and should not be
tampered with. Tampering with a cartridge valve could re-
sult in decreased lift cycle times for the Center Pivot Hitch.
The only required adjustment is on the upper hydraulic
control valve. This valve contains a rotary knob for setting
the Coulter Command to be used with either OPEN CEN-
TERED or CLOSED CENTERED tractor hydraulics.
Check the owners manual of your tractor to determine
what type of hydraulic system you have.
Refer to “Hydraulic Hook-Up & Function” on page 10 of
this manual for setting the hydraulic control valve for your
style of tractor.
Transport Cylinder Depth Channels
Whenplantingin soft soilconditions where sinkingof your
drillgaugewheelsmaybeaproblem,acylinderstop chan-
nel package (GP# 148-181A) is available to allow your
transport tires to run on the ground and assist in the sup-
porting the drill and hitch weight. The 148-181A cylinder
stopchannelpackagecontainstwocylinderstopchannels
(one for each transport cylinder). Since the transport hy-
draulics is a master-slave system, it is only necessary to
useonecylinderstopchannelonthemasterliftcylinderon
the left side of the Center Pivot Hitch. The other cylinder
stop channel will not work on the slave cylinder located on
therightside oftheCenter PivotHitchbecausethe liftcon-
trol switch for the Coulter Command mounts to that
cylinder.Useonlyonecylinderstopchannelonthemaster
lift cylinder (left side) on Center Pivot Hitches equipped
with Coulter Command.

14
Section 3 Troubleshooting
CPH and CP1000 Coulter Command System 148-258M-B 9/21/05
Great Plains Mfg., Inc.
Section 3 Troubleshooting
Problem Possible Cause Solution
Coulters move up when the
down switch is operated and
down when the up switch is
operated.
Not supplying oil to the "P" port of the
hydraulic valve. Reverse the remote hydraulic lever in the tractor.
Reverse the hoses at the quick couplers.
Solenoids wired backward or hoses from
port "A" and port "B" reversed at the
hydraulic valve.
Unplug solenoids and swap wire leads to
them.
Automatic coulter depth con-
trol stops adjusting coulter
depth.
tongue hydraulics switch bumped to
"manual" mode. Flip tongue hydraulics switch back to "auto" mode.
Tractor remote hydraulic lever not locked
for constant oil supply to valve. Lock Tractor remote hydraulic lever with rubber tarp strap or other means.
System variables out of adjustment Turn power switch OFF and back on again
so the system variables can reset. Then
flip AUTO-MANUAL switch to AUTO.
Turningthecoulter depth knob
does not set coulters deep
enough.
If the tongue cylinder runs completely
retracted, the tractor drawbar is to high. Use a straight drawbar or one which sweeps down.
In extremely hard conditions with the
machine standing the tongue cylinder
pulses but does not retract.
This is perfectly normal.The cylinder will
not penetrate the coulters on a stationary
machine in hard conditions.Pull forward
and check coulter depth on a moving
machine.
If the coulter depth knob is turned to "A"
and the tongue cylinder will not com-
pletely retract when moving through the
field then the internal sensor box linkage is
not set correctly.
Adjust the sensor box internal linkage. See
"Coulter Command Assembly Adjust-
ments" on page 9.
If the sensor box linkage is properly
adjusted and tongue cylinder constantly
pulses while moving through the field but
the front tongue cylinder will not retract,
you do not have enough system weight.
Add weights to the pull hitch frame weight
brackets. Add tool bar weight brackets to
coulter tool bars.
The hydraulic valve constantly
pulses when you are stopped
to refill or adjust something.
Hard soil conditions are hindering coulter
penetration while stopped. Flip tongue hydraulics switch to "manual" mode while you are stopped or turn coulter
command power "off". Pulsing does not
hurt the valve, but can be annoying.
Turningthecoulter depth knob
to "E" does not allow the
coulters to run shallow
enough.
The internal sensor box linkage is not set
correctly. Adjust the sensor box internal linkage. See "Coulter Command Assembly Adjust-
ments" on page 9.
Depth sensing gauge wheel
not lifting off the ground when
Center Pivot Hitch is raised.
Coulter Command power is OFF or 12 volt
power has been interrupted. Coulter Command must be connected and the power must be ON for the depth sens-
ing gauge wheel to raise when the All
Seeds Hitch is raised. The depth sensing
gauge wheel should raise with the trans-
port lift circuit with Coulter Command in
either the AUTO or MANUAL mode is long
as the power is ON.
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 connections on lift switch
lead.

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.
Coulterdepth erratic orwill not
adjust when you turn the
"DEPTH CONTROL" dial.
Moisture present in the master control
box. The master control box in the tractor
mustbekeptdry.Moistureonthecircuit
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.
Turntheknurledcontrolknobontheleft
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.
FortractorswithPioneerquickcouplers
usePioneer8010-4Ppoppetstylemale
couplers when operating in the OPEN
CENTER mode. See Figure 8, page
10.
Problem Possible Cause Solution

16
Section 3 Troubleshooting
CPH and CP1000 Coulter Command System 148-258M-B 9/21/05
Great Plains Mfg., Inc.
Transport lift cylinders will not
lift the Center Pivot Hitch for
transport.
OPEN-CENTER tractors with multiple
sets of hydraulic outlets use the #1 cir-
cuit for priority flow which slows down
orcutsoffflowtotheothercircuits.This
problem will occur if Coulter Command
ports "P" and "T" are plugged into the
#1 circuit.
Connect transport lift circuit ports "V1" and
"V2" to the #1 hydraulic circuit on OPEN-
CENTER tractors. Ports "P" and "T" of the
Coulter Command hydraulics should con-
nect to another circuit other than the #1 cir-
cuit on OPEN-CENTER tractors.
On CLOSED-CENTER tractors the
Coulter Command should be connect-
ed to a circuit capable of HYDRAULIC
MOTOR CONTROL for supplying con-
stantpressure/flowtoremotelocations.
If the machine will not raise when the
hydraulic tongue circuit is "locked in,"
consult your tractor dealer. You may
need to run the transport hydraulic cir-
cuit on a "priority circuit" and the
hydraulic tongue circuit on an alternate
remote if the tractor hydraulics allows
live hydraulic power to other remotes.
On CLOSED-CENTER tractors, if the
"priority circuit" is the only circuit suit-
able for HYDRAULIC MOTOR
CONTROL or supplying constant pres-
sure/flow to remote locations, then run
the transport hydraulic circuit on the
"priority circuit" and run the hydraulic
tongue circuit on an alternate remote
with the Coulter Command valve in the
OPENCENTERMODE.See"Tractors
with open center hydraulic systems
or fixed displacement hydraulic
pumps," page 11.
Problem Possible Cause Solution

17
Section 3 Troubleshooting
9/21/05 CPH and CP1000 Coulter Command System 148-258M-B
Great Plains Mfg., Inc.
Hydraulic Schematic
16313
System Schematics
If problems occur in the hydraulic or electric systems,
refer to the schematics below and on page 18 to help
locate the problem.

18
Section 3 Troubleshooting
CPH and CP1000 Coulter Command System 148-258M-B 9/21/05
Great Plains Mfg., Inc.
Electrical Schematic
16314