Adjusting Active Hydraulic Down-Pressure (Tractors With Closed Center Hydraulics)
NOTE: Active hydraulic down-pressure system is installed on the drill as standard equipment and is for use with tractors with closed center hydraulics or pressure/flow compensated hydraulics. If a tractor is being used with open center hydraulics, see your John Deere dealer and order the single point hydraulic down-pressure system. See Attachments section. When adjusting active hydraulic down-pressure it is important to remember the following: The opener gauge wheels determine the depth of penetration and therefore seed depth. The active hydraulic down-pressure system keeps the opener gauge wheels in contact with the soil surface as the ground contour changes. The amount of down-pressure required depends upon soil hardness, moisture, and residue cover. 1. Using tractor SCV I lever, lower the openers. Lever must be locked in the forward position to provide constant pressure/flow to drill openers. See Preparing the Tractor section to correctly set the relevant tractor SCV. |
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CAUTION:
DO NOT ride on machine to adjust down-pressure or you could fall off and be run over resulting in serious injury or death to you or others.
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2.
Set hydraulic down-pressure to 4800 kPa (48 bar; 700 psi) by turning adjusting knob (A), viewing pressure on gauge (B) and locking knob into place with wheel (C). (This is only an initial adjustment.)
IMPORTANT: Excessive down-pressure can increase wear, increase draft loads, decrease effective seed depth and reduce gauge wheel bearing life. Use only as much pressure as necessary to achieve consistent operating depth. 3. Make a Trial Pass In The Field: If seed depth is not satisfactory, adjust opener gauge wheel position. See Adjusting Opener Depth in this section. 4. If active down-pressure is not satisfactory, adjust down-pressure. IMPORTANT: Never adjust hydraulic down-pressure so needle is over 10000 kPa (100 bar; 1500 psi) without proper ballast and weight. NOTE: Increasing down-pressure above the initial settings will move the needle over 4800 kPa (48 bar; 700 psi). In order to keep machine in proper contact with the surface, weights must be added to the weight bar. (For 3-m machines a maximum of 454 kg (1000 lb) can be added to the weight bar). If drill frame lifts, there is usually excessive down-pressure and/or insufficient ballast. |
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NS43404,00000E4 -19-28OCT08-2/2 |