CB-634D Paving Compactor Propel System Caterpillar

The following procedure will calibrate the threshold current for the REVERSE propel solenoid. Perform the procedure in Specifications, Systems Operation, Testing and Adjusting, "Solenoid Valve (Forward Propel) - Calibrate" in order to calibrate the threshold current for the REVERSE propel solenoid.

Note: The calibration of current should be performed on a hard, level surface.

Note: The tank for the water spray system should be empty.

Note: Prior to conducting the calibration of current, run the machine in order to ensure that the hydraulic temperature reaches 38 °C (100 °F).

Note: Do not activate the steering wheel or the offset switch during the current calibration sequence. Activating these functions during the calibration can affect the calibration values and lead to undesirable machine performance.

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Illustration 1	g01323189

1. Remove the plastic cover from the side console.

2. Place the system in test mode by removing plug (1 ) from the harness with the "Test Mode" label. Make sure that the parking brake is ON.

   Note: On CB-634D machines remove the "model config" plug instead of the "Test Mode" plug.

   Note: The plug should be located near the fuse box. In order to access the plug on some machines, the side console cover may need removed. The plug should then be repositioned for better serviceability in the future.

3. Turn the key to the ON position.

4. Start the engine. Calibration should be made in "HI" idle. Release the parking brake.

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Illustration 2	g01535093

5. Set automatic speed control potentiometer (3) near the mid-position.

   Note: If the speed control potentiometer is in the full counter clockwise position, the calibration will not complete and a fault will occur after about 60 seconds. This situation will occur because the signals to the propel pump control are shut off in this condition.

6. Select LOW propel range on the speed switch for propel control (4) .

7. Move the propel control handle to the full REVERSE position.

8. When the machine just begins to move, press button (2) for the water spray in order to calibrate the reverse current. Approximately one minute is required to calibrate the reverse current. The light for the parking brake switch will flash twice in order to confirm that the calibration was accepted.

   Note: The light for the parking brake switch must flash twice in order to indicate successful calibration of the reverse current. Failure to wait for a confirmation can cause the reverse calibration of the threshold to fail.

9. Return the propel control handle to the NEUTRAL position.

10. Engage the parking brake, and turn the engine to the OFF position.

11. Connect the plug to the connector with the "Model Config" label.

    Note: If the operator does not detect motion after 60 seconds, a fault code will be displayed and the calibration sequence will be aborted. A fault code will be displayed and the calibration sequence will be aborted if the water spray button is pushed after the electrical current reaches the upper calibration limit of the pump solenoid.

    Note: If Calibration is not successful, a fault code will be displayed on the light for the parking brake switch. Verify that the potentiometer for the automatic speed control is set near the mid-position if calibration is not successful. If the calibration procedure is not successful, cycle power with the key and attempt the calibration procedure again.

12. Check all the machine functions for proper operation.

13. Install the plastic cover on the side console.