Great Plains CP1000 Assembly Instructions - Manual (Page 15)

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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
to the cylinder rod clamp using one of the 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.
A properly adjusted lift switch allows the automatic coulter
depth feature to be interrupted early in the lift cycle. This
provided the fastest lift cycle times when turning around in
the field. Operating the lift switch early in the lift 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
that the depth sensing gauge wheel cylinder always be ful-
ly extended when the Center Pivot Hitch is in field position
to allow the depth sensing gauge wheel to float through its
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
straightened or replaced immediately. To adjust the speed
sensor, loosen the two #6 screws on the sensor and slide
it toward the speed sensor plate. Rotate the depth sensing
wheel to the position where the speed sensor plate is clos-
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
When planting in soft soil conditions where sinking of your
drill gauge wheels may be a problem, a cylinder stop 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
stop channel package contains two cylinder stop channels
(one for each transport cylinder). Since the transport hy-
draulics is a master-slave system, it is only necessary to
use one cylinder stop channel on the master lift cylinder on
the left side of the Center Pivot Hitch. The other cylinder
stop channel will not work on the slave cylinder located on
the right side of the Center Pivot Hitch because the lift con-
trol switch for the Coulter Command mounts to that
cylinder. Use only one cylinder stop channel on the master
lift cylinder (left side) on Center Pivot Hitches equipped
with Coulter Command.