345B, 345B Series II and W345B Series II Excavators Engine and Pump Control Proportional Reducing Valve - Calibrate Caterpillar

Illustration 1	g00667434
Monitor Panel (1) Character display (2) Boom priority mode switch (3) Swing priority mode switch (4) Fine control mode switch (5) User mode switch (6) Travel alarm cancel switch

This function is used to calibrate the proportional reducing valve. This calibration must be performed when the proportional reducing valve or the controller is replaced.

Note: For proper operation of this function, the engine must be running with the engine speed dial switch in position 10 and the hydraulic oil must be at approximately 50 °C (122 °F).

1. Attach a 4900 kPa (711 psi) pressure gauge to the power shift pressure port of the main pump.

2. Place the backup switch in the AUT position.

3. Activate the service mode in order to calibrate the proportional reducing valve.

4. Enter service code 71.

   First, display (1) indicates the calibration point. "H" is displayed for the high pressure point and "L" is displayed for the low pressure point. The value of the correction is the last digit that is displayed.

   The calibration is performed at the following two points:

   • High pressure point 2500 kPa (363 psi)

   • Low pressure point 500 kPa (73 psi)

5. Perform the following operations in order to calibrate the low pressure point and the high pressure point.

   1. Depress fine control mode switch (4) in order to shift the blinking character. Position the blinking character to the third position from the right.

   2. Depress boom priority mode switch (2) in order to shift the calibration point. Shift to the high pressure point. "71H0".

   3. Depress swing priority mode switch (3) in order to shift the calibration point. Shift to the high pressure point. "71L0".

   4. Depress fine control mode switch (4) in order to shift the position of the character that is blinking. Shift the position of the character that is blinking to the position to the right.

   5. Depress boom priority mode switch (2) or swing priority mode switch (3) in order to locate the point that provides the most adequate pressure gauge reading.

   6. When boom priority mode switch (2) is depressed, the power shift pressure will INCREASE by 1 step.

   7. When swing priority mode switch (3) is depressed, the power shift pressure will DECREASE by 1 step.

      Note: The power shift pressure changes approximately 9 kPa (1.3 psi) per step.

6. Set the increments of the step for the power shift pressure.

   1. Depress travel alarm cancel switch (6) in order to set the new values.

      When the new value is set, the position of the blinking character does not change. The third position from the right flashes "H" to "L".