Cylinder Leakage Test-Series System

To compensate for a smaller volume of oil in rod end of master cylinder (A), the first right-hand (slave) cylinder (B) is 6.4 mm (1/4 in.) smaller diameter than master cylinder. The second (slave) cylinder (C) is 6.4 mm (1/4 in.) smaller diameter than first slave cylinder (B).

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IMPORTANT: To ensure accurate test results, warm hydraulic oil to operating temperature before beginning tests.

2. Set depth control so sweeps are at least 50 mm (2 in.) above ground when machine is lowered.

3. Lower machine to depth stop.

4. Position tractor control lever(s) in "neutral" position.

5. Shut off tractor engine.

6. Measure and record length of each cylinder rod (distance from rod guide to base of rod clevis) in system.

7. Let machine stand for one hour.

8. Re-measure and record rod length on each cylinder (as in step 6).

9. If any cylinders have retracted 6.4 mm (1/4 in.) or more, see your John Deere dealer for cylinder diagnosis and repair.

See following DIAGNOSIS CHART FOR THREE CYLINDER DEPTH CONTROL SYSTEM.

Be sure to retest system after repairing a cylinder.

A-#1 Master Depth Control Cylinder
B-#2 Right-Hand Wing Depth-Control Cylinder (1st Slave)
C-#3 Left-Hand Wing Depth-Control Cylinder (2nd Slave)

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