Great Plains CTA4000 Operator Manual - Manual (Page 19)

Preparation and Setup 15
08/03/2010 160-269M-A
Hydraulic Circuit Connections
The implement has one or two hydraulic circuits (with a
low pressure sump return line). The standard circuit pow-
ers lift, fold and weight-transfer functions, controlled by a
valve block on the left front of the implement. An optional
circuit operates the markers.
Great Plains hydraulic hoses are color coded to help you
hookup hoses to your cart outlets. Hoses that go to the
same remote valve are marked with the same color.
If the tractor has a load-sensing or constant-flow hydraulic
system, the implement must be equipped with an optional
bypass valve to avoid tractor damage. See “Hydraulic Bypass
Kit” on page 53 for ordering.
1. Shut down tractor hydraulics.
2. If optional markers are already installed, connect
marker hoses to receptacles
and per instruc-
tions supplied with markers.
3. Connect the Retract hose of the (blue) Lift/Fold pair
to receptacle
.
Connect the Extend hose of the (blue) Lower/Unfold
pair to receptacle
4. Skip receptacles and , not used by this imple-
ment.
5. Connect the sump hose to receptacle .
6. Check hose routing to ensure adequate slack for link
arm movement, and clearance from pinching or
abrading cart/implement components.
Bleeding Hydraulics
To function properly, the hydraulics must be free of air. If
hydraulics have not been bled, they will operate with
jerky, uneven motions and could cause wings to drop
rapidly during folding or unfolding. During initial imple-
ment setup (which may have been done by your dealer)
or if you replace a hydraulic component, complete the
following procedures.
Escaping fluid under pressure can penetrate skin, causing seri-
ous injury. Avoid the hazard by relieving pressure before dis-
connecting or “cracking” hydraulic lines. Use a piece of
paper or cardboard, NOT BODY PARTS, to check for leaks.
Wear protective gloves and safety glasses or goggles when
working with hydraulic systems. If an accident occurs, seek
immediate medical attention from a physician familiar with
this type of injury.
Color
Cart
Ports
Hydraulic Function
Orange , Markers
(also used for auger on cart)
Blue Lift, Fold and Weight Transfer
Lower, Unfold
(not used on cart)
Yellow ,
Not Used by implement
(used for fan on cart)
No Color Sump return
A B
C
D
E F
G
A B
C
D
E F
G
Figure 9
Levers for Lift Bleed
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