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. A74367
    A74367-UN-20FEB12

    A - Half-Width Disconnect Handles

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


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

  4. NOTE: Choose one meter at a time during procedure.

    A73557
    A73557-UN-15NOV11

    A74520
    A74520-UN-15FEB12

    A - Motor Selection

    B - Drop-down List

    C - Motor Speed Selection, Calibrate Valve

    D - Start

    Select a meter check box (A) to run the motor for calibrating that valve. (Choose one meter at a time in running procedure.)


  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—125 rpm, calibration is needed.

  9. IMPORTANT: A 2 mm hex screw is located inside the valve (B). 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.

    A71187
    A71187-UN-07APR11

    A77847
    A77847-UN-10MAY13

    A - Valve Block

    B - Adjustment Valve

    C - Jam Nut

    D - Adjustment Screw, 6 mm

    E - Dust Cap

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


  10. Remove dust cap (E).

  11. Loosen jam nut (C) on valve.

  12. 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—125 rpm on display.

  13. Tighten jam nut and verify that speed is still 115—125 rpm.

  14. Reinstall dust cap (E).

  15. Repeat for each motor as needed.

LD45720,0000511-19-20130510