VALVE AS-MANUAL 2097354 - Caterpillar

Introduction
The proportional reducing valve for the power shift pressure is located on the main pump housing. The proportional reducing valve sends the reduced pilot oil pressure to the regulators at the idler pump and the drive pump. The output flow of the idler pump and the drive pump is controlled in accordance with the power shift pressure. Power shift pressure is controlled by the machine ECM.Required Tools
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Tooling group "A"
198-4240 Digital Pressure Indicator Gp
Table 1
Tool Item Qty Part Number Description
A 198-4240 Digital Pressure Indicator Gp
A1 1 198-4234 Indicator
A2 1 198-4237 Pressure Sensor 3447 kPa (500 psi)
A3 1 198-4236 Extension Cable Machine Preparation
The following procedure must be completed before performing the calibration.
Set the pilot pressure to the specifications in Testing and Adjusting, "Relief Valve (Pilot) - Test and Adjust" for the machine.
Position the machine on level ground.
Stop the engine.
Release the pressure in the hydraulic system. Refer to Testing and Adjusting, "System Pressure - Release".
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Pressure tap for the proportional reducing valve (power shift pressure)
Connect a 3447 kPa (500 psi) pressure sensor to the pressure tap for power shift pressure.
Start the engine.
Place the machine controls at the following settings: engine speed dial "10" and AEC switch OFF. Refer to Testing and Adjusting, "Engine Performance - Test (Engine Speed)" for engine rpm settings.
Increase the hydraulic oil temperature to 55° 5°C (131° 9°F). Calibration Procedure
Enter the service mode. Input the password "9992".
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Select "Power Shift Pressure" from the "Calibrations" menu.
Press the OK key in order to start the calibration. The engine RPM will automatically increase to the equivalence of engine speed dial 10.
Confirm the notes on the monitor display. Set up the test conditions in accordance with the instructions. Press the OK key.
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Use the arrows to adjust the pressure until the pressure reading for power shift pressure is at 500 50 kPa (73 7 psi). Press the OK key.
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Use the arrows to adjust the pressure until the pressure reading for power shift pressure is at 2500 50 kPa (363 7 psi). Press the OK key.
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If calibration was successful and no errors occurred, the display will indicate that the calibration is complete.
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The "Error" screen will be displayed on the monitor if an error occurs. The process of calibration will not be saved and the process must be restarted.