Calibrate Hydraulic Drive Motor Valve

NOTE: Perform Bleed Procedure before Calibration Procedure after any system repairs.

Calibrating VRD motors is required after repairs are made to any hydraulic drive motor or valve.

1. Start tractor. Run engine at slow idle and run air cart fan until hydraulic oil reaches minimum temperature of 21° C (70° F).

2. 
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   A - Half-Width Disconnect Handles

   Meters That Are Being Calibrated: Push both half-width disconnect handles (A) up to stop product flow.

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3. Access Hydraulic Maintenance by using Quick Select Button J to navigate to Diagnostics and Test screen.

4. 
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   A - Motor Selection

   B - Drop-down List

   C - Motor Speed Selection, Calibrate Valve

   D - Start

   Select a motor check box (A) to run that motor.

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5. Select drop-down (B) and set to calibrate valve (C).

6. Select Start button (D).

7. Motor runs at calibration speed.

8. If motor speed readout on monitor is not 115 to 125 rpm, calibration is needed.

9. IMPORTANT: A 2 mm hex screw is located inside the 6 mm adjustment screw (D). Do not loosen or use smaller screw during calibration procedure.

   NOTE: Use a person to view and report on the monitor display readings and a person at the meter to make the actual adjustment.

   
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   A - Valve Block

   B - Adjustment Valve

   C - Jam Nut

   D - Adjustment Screw, 6 mm

   Locate valve block (A) and valve (B) for selected meter.

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10. Loosen jam nut (C) on valve.

11. NOTE: To increase motor speed, turn adjustment screw clockwise.

    Using a 6 mm hex key wrench, turn adjustment screw (D) until motor speed is 115 to 125 rpm on display.

12. Tighten jam nut and verify that speed is still 115 to 125 rpm.

13. Repeat for each motor as needed.