Adjusting Opener Down-Pressure-Tractors With Open Center Hydraulic Systems

IMPORTANT: Change valve (E) must be in closed position when operating. Lock-up valve (D) must always be open while running and closed during service.

IMPORTANT: Drill MUST BE equipped with Open Center Hydraulic Kit with Change Valve (E), if used with a tractor with an open-center hydraulic system. See your John Deere dealer for installation.

1. Refer to UNDERSTANDING ACTIVE HYDRAULIC OPENER DOWN-PRESSURE SYSTEM and determine initial pressure setting.

2. Place tractor transmission in "park" and keep engine running.

3. Lower openers by holding the SCV lever forward for a few seconds, then release. This pressurizes the opener down-pressure system.

4. Check gauge to determine if pressure requires adjustment.

NOTE: Gauge needle will not move as knob (A) is turned.

NOTE: One full turn equals approximately 1724 kPa (17 bar) (250 psi). Once set, lock knob (A) in position with wheel (C).

a. To decrease down-pressure setting, open change valve (E), turn knob (A) counterclockwise and close valve (E).

b. To increase down-pressure, turn knob (A) clockwise.

5. Pressurize down-pressure system by raising and lowering the openers, holding the SCV lever forward for a few seconds to pressurize the cylinders.

N59937
N63048
A37910


A-Knob
B-Pressure Gauge
C-Wheel
D-Lock-Up Valve
E-Change Valve

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6. Check pressure gauge (B) after pressurizing system. Gauge needle should be at new setting. If gauge needle has not moved, see OPENER DOWN-PRESSURE SYSTEM (TRACTOR WITH OPEN CENTER HYDRAULICS) in the Troubleshooting section.

7. Close change valve (E).

8. Make a trial pass in the field.

9. If opener penetration is not satisfactory or pressure drops during operation, activate SCV to repressurize system. If gauge wheel contact is adequate but depth of penetration is not, see OPENER COMPONENTS AND ADJUSTMENTS and ADJUSTING GAUGE WHEEL AND SEEDING DEPTH in Preparing The Machine section.

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