COUPLING 2603959 - Caterpillar

Set the engine speed dial at "1".
Lower the left console.
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Power mode control button on the soft panel switch
Push down on the power mode control button to activate power mode.Note: The indicator light will be illuminated when power mode is activated.
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Automatic Engine Speed Control (AESC) as displayed on the programmable function key in the monitor.
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 aggressive mode (monitor display)
Select the hydraulic modulation mode as aggressive. Press the lower front switch on the left joystick to select the hydraulic modulation mode.
Ensure that the air conditioning is turned off for the following test.
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Transmission control button on the soft panel switch
Push down on the transmission control button to select FIRST GEAR.Note: The first indicator light will illuminate when the transmission is in FIRST GEAR.
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Creeper speed control button on the soft panel switch
Push down on the creeper speed control button to activate the creeper speed control.Note: The indicator light will be illuminated when the creeper speed control is activated.Test Procedure
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.
Release the service brake pedal.
Fully depress the travel pedal.
Start the Electronic Technician
Select the Machine ECM and then select “OK”.
Select “Diagnostics” from the main menu.
Select “Diagnostic Tests”.
Select “Override Parameters”.
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ET configuration screen
(6) “Travel Pilot Solenoid Current Override”
Select “Travel Pilot Solenoid Current Override” (6) and set the current to 0.8 amp.
Verify the main pump flow on the flow meter and the engine speed in Cat ET.
Disable all overrides and release the travel pedal.
Compare the main pump flow on the flow meter with the calculated target pump flow, refer to Table 1.
If the main pump flow is not within tolerances, then adjust maximum displacement. Refer to Section "Adjustment Procedure".Adjustment Procedure
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Main pump (typical example)
(1) Maximum displacement screw
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.
Remove the cap from maximum displacement screw (1).
If the main pump flow is too high, turn the adjustment screw clockwise to decrease the maximum displacement. If the main pump flow is too low, turn adjustment screw counterclockwise to increase the maximum displacement.Note: Always make the final adjustments as the flow increases.
While maximum displacement screw (1) is being held, tighten the locknut to the specified torque.
Repeat the "Test Procedure" until the target pump flow has been met.
Install the cap onto maximum displacement screw (1).
If the main pump flow procedure was successful, then failure may have occurred in the following components:
Travel section of the main control valve
Maximum displacement of the travel motorNote: Perform the procedures in the main