CAUTION: Escaping fluid under pressure can penetrate skin causing serious injury to you or others. Avoid hazard by relieving pressure before disconnecting hydraulic or other lines. Tighten all connections before applying pressure. Search for leaks with a piece of cardboard. Protect hands and body from high pressure fluids.

If an accident occurs, see a doctor immediately. Any fluid injected in skin must be surgically removed within a few hours or gangrene can result. Doctors unfamiliar with this type injury may call Deere & Company Medical Department in Moline, Illinois, or other knowledgeable medical source.

2. Move actuator arm on single point depth control back so that single point depth control valve is not activated during this procedure.

3. Cycle machine up and down 3 times.

NOTE: Hold SCV in extend position for 5 seconds at end of each upward stroke. This fully rephases depth control hydraulic system.

4. Lower machine until blades are approximately 101-203 mm (4-8 in.) above ground.

5. Shut off tractor engine.

6. Locate and disconnect pressure line from SCV. This line goes to single point depth control valve and to base end of main frame cylinders. Leave return line (wing frame to tractor) as is.

CAUTION: Wings are heavy and can fall causing serious injury or death to you or others. Keep all individuals away from machine when placing SCV in FLOAT position.

7. Return to tractor cab. Lift SCV lever stop in tractor console and push SCV lever fully forward to FLOAT position.

8. Measure and record length of all depth control cylinder rods.

9. Let machine stand for an hour. After an hour, measure and record rod length for each cylinder as done in Step 8. Note if cylinder(s) extended or retracted.

10. If any of depth control cylinders have extended or retracted more than 10 mm (3/8 in.), match your results in table. (See ANALYZING TEST RESULTS FOR DEPTH CONTROL INTERNAL LEAKAGE in Service section in order to locate leaking cylinder(s).)

NXH8,M63760,ZM1 -19-09JUN98-1/1