M315 Excavator Hydraulic System Engine Speed - Test and Adjust

^( 1 )	123-6472 Portable Diagnostic Tool (PDT) is included in 123-6471 Diagnostic Tool Group (PDT).
^( 2 )	A laptop computer may be used as a substitute. The laptop computer must use M300 Technician.

To optimize the hydraulic system, the engine load speed must be set to match the hydraulic performance. The adjustment should be made when the main pump has been replaced or the engine has been replaced.

Note: Prior to the procedure, the proportional reducing valve on the solenoid must be set to the proper specification. Refer to Testing and Adjusting, "Main Pump (Proportional Reducing Valve) - Test and Adjust".

Test

Prior to any adjustment, refer to the "Preparations" section in the Testing and Adjusting, "Operational Checks".

Start the engine.

Lower the left console.

Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F).

Place the AEC switch in the OFF position.

Place the mode switch in the MODE III position.

Check the engine speed at low idle. The engine speed should be 1000 to 1050 rpm.

Check the engine speed at high idle. The engine speed should be 2380 to 2420 rpm.

If the engine speed in low idle or high idle is not correct, perform the adjustment procedure.

Adjust

Remove the cover from the governor actuator near the spring.

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Illustration 1	g00734829
Top view of governor

Measure the length of the governor rod (A) between the two locknuts in order to ensure that the governor linkage is assembled properly.
Length of governor rod (A) ... 149 - 1 mm (5.87 - 0.04 inch)

Range of Actuator (M300 Technician)

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Illustration 2	g00293665
Left side of seat (1) Service connector

Connect the laptop computer to the service connector (1) .
Note: Refer to Special Instruction, REHS0701, "Instructions for the Use of the M300 Technician Software with a Laptop Computer".

Start the engine.

Lower the left console.

Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F).

Start M300 Technician.

Select "Configuration".

Select "Operation Mode" under "Test Operation".

Select the "Change Value" button.

Change "New Value" to "Current Gov Motor".

Select "OK".

Select "Constant Value".

Select the "Change Value" button.

Enter a value of 30, which will move the governor lever toward the LOW IDLE position.

Select "OK".

Allow the governor lever to finish any movement.

Select "Change Value".

Increase the numeric value by 5 or 10 in order to move the governor lever toward the LOW IDLE position.

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Illustration 3	g00862993
Split of the governor lever

Allow the governor lever to finish any movement.
Note: Once the governor lever has reached the LOW IDLE position, the governor lever will split.

Select "Change Value".

Enter a value of 0, which will move the governor lever toward the HIGH IDLE position.

Select "OK".

Allow the governor lever to finish any movement.

Repeat step 16 and step 17 until the governor lever reaches the HIGH IDLE position and the governor lever splits. Use negative numbers.

Select "Operation Mode".

Select "Normal Operation".

Select "OK".

Range of Actuator (PDT)

Note: The following procedure is only needed when service is done on the lever or on the ball joints between the governor and the fuel pump.

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Illustration 4	g00293665
Left side of seat (1) Service connector

Connect the 123-6472 Portable Diagnostic Tool to the service connector (1) .
Note: Refer to Special Instruction, SEHS9825 for the use of the 123-6471 Portable Diagnostic Tool Group .

Start the engine.

Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F).

Select the "F1 Config/Cal" function.

Select the "8 Test Operation" function.

Select the "1 Operator Mode" function.

Use the down arrow key until the "Current Gov Motor" function is available.

Press the "Enter" button.

Select the "2 Constant Value" function.
Note: The display will read "-100 100 ± 1". "0" represents the motor with no power.

Use the down arrow key to change the governor lever position. Increase the numeric value by "5" or "10". Allow the governor lever to finish any movement.

Move the governor lever to the LOW IDLE position by increasing the numeric value. Increase the numeric value by "5" or "10". Allow the governor lever to finish any movement.
Note: Push the governor lever approximately 3 mm (0.1181 inch) beyond the maximum position. Do not push the governor lever more than the recommended value.

Move the governor lever to the HIGH IDLE position by decreasing the numeric value. Decrease the numeric value by "5" or "10". Allow the governor lever to finish any movement.
Note: Push the governor lever approximately 3 mm (0.1181 inch) beyond the maximum position. Do not push the governor lever more than the recommended value.

Press the "Menu" button in order to exit the "Constant Value" function.

Select the "1 Operator Mode" function.

Use the down arrow key until the "Normal Operation" function is available.

Press the "Enter" button.

Press the "Menu" button until the main menu appears on the screen.

Electronic Adjustment M300 Technician

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Illustration 5	g00293665
Left side of seat (1) Service connector

Connect the laptop computer to the service connector (1) .
Note: Refer to Special Instruction, REHS0701, "Instructions for the Use of the M300 Technician Software with a Laptop Computer".

Turn the engine start switch key to the ON position.

Start M300 Technician.

Select "Tools" from the menu.

Select "Calibrations" from the menu.

Select the "Speed Dial Cal" function.

Select the "OK" button on the screen with the mouse.

Place the "AEC Switch" in the OFF position.

Turn the engine speed dial to the HIGH IDLE position. Check the voltage.
Note: The voltage should be approximately 0.4 to 0.5 V.

Select the "Continue" button on the screen with the mouse.

Turn the engine speed dial to the LOW IDLE position. Check the voltage.
Note: The voltage should be approximately 4.3 to 4.6 V.

Select the "Continue" button on the screen with the mouse.

Select "OK" button on the screen with the mouse.

Start the engine.

Select the "Gov Act Cal" function.

Select the "OK" button on the screen with the mouse.

Enter a low idle speed between 1000 rpm and 1050 rpm.

Select "Continue" on the screen.

Note: The engine will automatically vary between low idle and high idle.

When the calibration is complete, "Function Ended: Calibration OK" should appear.

Select the "Close" button on the screen with the mouse.

Select the "Cancel" button on the screen with the mouse.

Check the engine speed at low idle. The engine speed should be 1000 to 1050 rpm.

Check the engine speed at high idle. The engine speed should be 2500 to 2550 rpm.

Select the "Tools" option from the pull-down menu on the screen.

Select the "Teach" function.

Select the "Save Paramater(s)" function.

Select the "OK" button on the screen with the mouse.

Select the "Yes" button on the screen with the mouse.

Select "OK" button.

Select "Cancel" button.

Electronic Adjustment PDT

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Illustration 6	g00293665
Left side of seat (1) Service connector

Connect the 123-6472 Portable Diagnostic Tool to the service connector (1) .
Note: Refer to Special Instruction, SEHS9825 for the use of the 123-6471 Portable Diagnostic Tool Group .

Start the engine.

Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F).

Select the "F1 Config/Cal" function.

Select the "2 Calibration" function.

Select the "1 Speed Dial Cal" function.

Turn the engine speed dial to the HIGH IDLE position. Check the voltage.
Note: The voltage should be approximately 0.4 to 0.5 V.

Press the "ENTER" button.

Turn the engine speed dial to the LOW IDLE position. Check the voltage.
Note: The voltage should be approximately 4.3 to 4.5 V.

Press the "ENTER" button.

Select the "2 Speed Cal" function.

Enter a low idle speed between 1000 rpm and 1050 rpm.

Press the "ENTER" button twice. The PDT will electronically calibrate the engine.
Note: The engine will automatically vary between low idle and high idle.