PLATE & FILM GP 2558383 - Caterpillar

Introduction
The proportional reducing valve for limiting pilot pressure for the travel function is located underneath the cab.The proportional reducing valve limits pilot oil pressure from the travel pedals to the control valve in the main control valve. This valve is controlled by a PWM signal from by the machine ECM in accordance to operator and pressure sensor input.Required Tools
Illustration 1 g01623868
Tooling group "B"
198-4240 Digital Pressure Indicator Gp
Table 1
Tool Item Part Number Description Qty
B 198-4240 Digital Pressure Indicator Gp
B1 198-4234 Indicator 1
B2 198-4237 Pressure Sensor 3447 kPa (500 psi) 1
B3 198-4236 Extension Cable 1 Machine Preparation
The following procedures 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".
Illustration 2 g03783416
Front view of main control valve (typical example)
(1) Pressure tap (travel)
(2) Proportional reducing valves (pilot pressure limit)
Connect a 3447 kPa (500 psi) pressure sensor to pressure tap (1) for attachment valve.
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
Monitor Procedure
The following procedure will allow the user to calibrate the pilot pressure limit solenoid valves using the monitor.
Enter the "Service" mode.
Enter password "9992".
Select "Calibrations" menu.
Select "Pilot Pressure Limit Solenoid" from the "Calibrations" menu.
Select the pilot pressure limit solenoid valve to calibrate from the "Pilot Press Limit Solenoid" 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.
Hold the control input in the FULL ON position.
Use the arrows to adjust the pressure until the pressure reading is at 1500 50 kPa (218 7 psi). Press the device for activation 3 times and release the device for activation 3 times for each adjustment.
Press the OK key when the pressure reading holds steady at 1500 50 kPa (218 7 psi) and no more adjustment is required.
Hold the control input in the FULL ON position.
Use the arrows to adjust the pressure until the pressure reading is at 1500 50 kPa (218 7 psi). Press the device for activation 3 times and release the device for activation 3 times for each adjustment.
Press the OK key when the pressure reading holds steady at 1500 50 kPa (218 7 psi) and no more adjustment is required.
If calibration was successful and no errors occurred, the display will indicate that the calibration is complete.
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.