PISTON 8J2021 - Caterpillar

Disable the automatic engine speed control through the monitor by pressing the programmable button.
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Hydraulic modulation switch on left joystick
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Hydraulic modulation medium mode (monitor display)
Select the hydraulic modulation mode as medium. Press the lower front switch on the left joystick to select the hydraulic modulation mode.
The air conditioning should be turned off for the following test.
Start Cat (ET).
Select the Machine ECM and then select “OK”.
Select “Service” from the main menu.
Select “Service Procedures”.
Creating main pump pressure higher than 38,000 kPa (5,512 psi) for more than five seconds may damage the machine.
Select "Line and Main Relief Adjustments".Note: This selection provides a permanent flow of about 40 L/min (11 US gpm) from the main pump without any margin pressure control. The multi combined valve (MCV) load sensing cutoff valve pressure is set to maximum and the MCV line relief pressure is set to 25,000 kPa (3,626 psi). Cat (ET) also allows the main pump pressure limit to be raised in order to provide high pressure of about 43,000 kPa (6,237 psi).
Lower the left console.
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Hydraulic modulation switch on left joystick
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Hydraulic modulation medium mode (monitor display)
Select the hydraulic modulation mode as medium. Press the lower front switch on the left joystick to select the hydraulic modulation mode.
If the line relief valve pressure is not set to the proper specification, refer to the "Adjustment Procedures".Adjustment Procedures
Personal injury or death can result from sudden machine movement.Sudden movement of the machine can cause injury to persons on or near the machine.To prevent injury or death, make sure that the area around the machine is clear of personnel and obstructions before operating the machine.
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(7) Relief valve (port B)
(8) Plug
(9) Adjustment screw
(10) locknut
(11) Multi combined valve
(12) Relief valve (port A)Adjustment Procedure (Port A)
Stop the engine.
Release the pressure in the hydraulic system.Note: Refer to Testing and Adjusting, "System Pressure - Release".
Raise the left console.
Remove the cap from line relief valve (12).
To avoid damage to the hydraulic components, do not turn the main