SEAL 1143001 - Caterpillar

Test for the Tool Relief Valve
Note: A temporary setting of the main relief valve pressure is required before any line relief valve pressure setting is adjusted. Refer to the temporary setting of the main relief valve in Testing and Adjusting, "Relief Valve (Main) - Test and Adjust" for the machine.
Position the machine on level ground and stop the engine.
Release the pressure in the hydraulic system. Refer to Testing and Adjusting, "Hydraulic System Pressure - Release" for the machine.
Illustration 1 g01534994
Pump Compartment
(9) Pressure tap (drive pump )
(10) Pressure tap (idler pump )
(11) Pressure tap (power shift)
Install a pressure gauge with a 6000 kPa (870 psi) capacity on pressure tap (11) for the power shift.
Install a pressure gauge with a 60000 kPa (8700 psi) capacity on pressure tap (9) for the drive pump.
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 the machine for engine rpm settings.
Warm the hydraulic oil to 50 °C (122 °F).
Set the pilot pressure to the specifications in Testing and Adjusting, "Relief Valve (Pilot) - Test and Adjust" for the machine.
Use the following procedure to access the "Service" mode of the monitor.
Enter the "Service" menu on the monitor.
Enter password 9992. Note: For more detailed steps with entering passwords or entering the service mode, refer to Testing and Adjusting, "Service Mode - Enter" for the Tool Control System.
Select "Override Parameters" menu.
Select "Power Shift Pressure".
Use the arrows to adjust the power shift pressure. Pressing the arrows one time will adjust the power shift pressure 10 kPa (1.5 psi).Note: The value for power shift pressure on the monitor may not always match the pressure reading on the pressure gauge. Adjust the value on the monitor until the desired power shift pressure is attained on the pressure gauge that is connected to the pressure tap for power shift pressure. The actual power shift pressure must be 2850 kPa (413.4 psi) on the pressure gauge.Note: To prevent a change in power shift pressure during the adjustment of line relief valves, do not leave the "Override Parameters" screen, and do not turn the engine start switch to the OFF position.Note: Refer to Systems Operation, "Monitoring System" for the machine for additional information on Service Mode.
Be sure to select a work tool that provides one-way flow. Refer to Testing and Adjusting, "Work Tool - Select" for the Tool Control System. Note: To prevent oil flow to the work tool during this testing and adjusting procedure, close the stop valves in the lines for the work tool.Adjustment of the Tool Relief Valve
To adjust the line relief valve for one-way flow, push the left pedal FORWARD. Hold the pedal in this position.
Check the pressure in the work tool at the drive pump's pressure tap (9).
Return the pedal to the NEUTRAL position.
Compare the pressure reading to the specification of 21000 kPa (3046 psi). If the pressure reading is within the specification, no further adjustment is