TRACK GP 3725790 - Caterpillar

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The Caterpillar Electronic Technician Software is equipped with a feature for calibrating the machine control system. The calibration mode is accessed by connecting the ET to the vehicle. Select the Machine Control ECM. This is shown in illustration 1.
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Once the Machine Control ECM is selected, the calibration procedures are accessed through the "Service Menu". Select "Calibrations" from the menu. This is shown in illustration 2.
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The warning for safety during calibration will be displayed on the ET screen. Select "OK" after reading the warning.The calibration of the electro-hydraulic control valve determines the point when hydraulic oil flow starts for all implement functions. Calibration determines the amount of electric current that must be sent to each valve in order to initiate flow to the cylinders. The amount of electric current that is required to establish full flow to the cylinders is determined. The Machine Control ECM records these currents in memory. The ECM uses these ranges until the ECM is replaced or the calibration procedure is performed again.For the initial calibration of the valve, you must perform all of the portions of the procedure: bowl, apron and ejector. During subsequent recalibrations, each section of the procedure may be performed independently.
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(1) "Bowl Solenoids Calibration" (2) "Ejector Solenoids Calibration" (3) (Apron Solenoids Calibration)
Select the proper calibration. Select the required boxes. See illustration 4. In order to calibrate the bowl solenoids, select "Bowl Solenoids Calibration" (1).
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The ET screen will instruct the technician to perform actions at location (4) and location (5). The actual instructions are listed below:
The vehicle parking brakes must be set.
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198-1758 Electro-Hydraulic Calibration Service Tool Group
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Test port for the pump pressure of the implement ( 621G and 627G)
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198-1758 Electro-Hydraulic Calibration Service Tool Group Connected on the 621G and 627G
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198-1758 Electro-Hydraulic Calibration Service Tool Group Connected on 623G
Attach the 198-1758 Electro-Hydraulic Calibration Service Tool Group to the test port for the implement pump pressure. Plug the end of the tool into the electrical harness for the transmission.
Start the engine and set the engine to high idle.
Operate the machine until the hydraulic oil temperature is between 50 °C (122 °F) and 75 °C (167 °F).
The bowl must be empty of material.
Move the bowl into the full raised position.
After the previous initial conditions have been met, select the "NEXT" button in the ET.
Move the joystick to the Bowl Up position. Hold the joystick until the ET software indicates that the calibration is complete.
Release the joystick.
Lower the bowl to the ground.
After the previous conditions have been met, select the "NEXT" button on the ET software.
Move the joystick into the full Bowl Down position. The full Bowl Down position is past the detent. Hold the joystick in this position until the ET software indicates that the calibration is complete.
Release the joystick.
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The ET software will then display a screen that indicates the status