Great Plains NTA3007 Operator Manual - Manual (Page 105)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 101
2012-07-02 Table of Contents Index 166-371M
Opener Down-Force (Hydraulic)
Down-Force Safety Information
Assign two people to this task, one in the tractor cab, ready to
shut the tractor down on hand signal from the adjuster or any
unplanned event. This adjustment requires working near the
unfolded and lowered drill with the hydraulic system active.
High Pressure Fluid Hazard:
Escaping fluid under pressure can penetrate the skin causing
serious injury. Use a piece of paper or cardboard, NOT BODY
PARTS, to check for suspected 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.
Crushing Hazard:
Keep body parts clear of wings and openers while adjusting.
Keep all bystanders well away. You will be seriously injured or
killed if you are caught between lowering openers and ground,
or raising openers and drill frame.
Falling Hazard - Tires Not a Step:
Do not use tires as steps or platforms. At higher
down-pressures, opener frames can lift gauge wheels off the
ground, and can lift main wheels sufficiently for them to spin.
Down-Pressure General Information
In moderate to heavy no-till conditions, the openers are
normally lowered, as a gang, to full extension of the lift
cylinders. To aid penetration, the hydraulic
down-pressure system is used primarily to transfer
weight to the wings.
The down-pressure is controlled by adjustable valves
located inboard on the front of the left wing. Sub-frame
cylinders are always at full travel during field operations.
Figure 100
Down-Pressure Valve Location
29424