Great Plains 3N-4025P Operator Manual - Manual (Page 18)

14 3N-40P Table of Contents Index Great Plains Manufacturing, Inc.
196-538M Table of Contents Index 2014-01-29
Make Hydraulic Connections
High Pressure Fluid Hazard:
Only trained personnel should work on system hydraulics!
Escaping fluid under pressure can penetrate skin, causing
serious injury. Avoid the hazard by relieving pressure before
disconnecting 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.
Refer to Figure 4
Great Plains hydraulic hoses have color coded handle
grips to help you hookup hoses to your tractor outlets.
Hoses that go to the same remote valve are marked with
the same color.
Hydraulic Circuit Connections
The drill has three or four hydraulic circuits. The standard
circuits power drive/locks, lift, and fold. If markers are
present, they require a fourth circuit (or an additional
selector valve sharing the fold circuit).
If the tractor has only one circuit rated for continuous
flow, reserve it for the hydraulic drive.
Current Style Color Coded Hose Handle Grips
To distinguish hoses on the same hydraulic circuit, refer
to the symbol molded into the handle grip. Hoses with an
extended-cylinder symbol feed cylinder base ends.
Hoses with a retracted-cylinder symbol feed cylinder rod
ends.
10. Shut down tractor hydraulics.
11. Connect the hydraulic drive circuit.
12. Connect remaining circuits.
13. Check hose routing to ensure adequate slack for link
arm movement, and clearance from pinching or
abrading drill components.
Refer to Figure 5
14. If the drill is to be unfolded, set the selector valve to
Locks (handle to drill center). Valve is located near
rear end of left tongue tube.
Hose Color Hydraulic Function
Gray Fold
Blue Lift
Green Marker Cylinders (Option)
Yellow
Hydraulic Drive and
Wing and Swivel Locks
Figure 4
Color Coded Hose Grips
31733
The drive is compatible only with closed center, PC (pressure
compensated) closed or LS (load sensing) hydraulic systems.
Do not use an open center system.
Figure 5
Hitching: Drive/Lock Selector Valve
21844