550B Wheel Harvester, 560B Wheel Harvester, 570B Wheel Harvester and 580B Wheel Harvester Power Train Caterpillar

Description of Test

Do not perform the following test until you have performed the procedures in Testing and Adjusting, "Power Train Charge System Pressure - Test".

The following procedure is used in order to determine whether the power train pump has excessive internal leakage.

If no problems are found proceed to the Testing and Adjusting, "Power Train Drive Loop Speed - Test and Adjust" for the machine that is being serviced.

Preparation for Testing

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Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the attachments have been lowered, oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.

1. Ensure that the hydraulic oil in the system is at normal operating temperature. Park the machine on a smooth, level surface.

2. Fully lower the machine. Lower the harvester head to the ground. Place the operating mode switch in the NEUTRAL position.

3. Install the steering frame lock. Block the wheels. Install the swing lock pins. Stop the engine.

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Illustration 1	g00686956
(1) Wiring harness for the rear parking brake control valve. (2) Wiring harness for the front parking brake control valve.

4. Remove wiring harness (1) and (2) from the parking brake control valve. Each wiring harness is held by one screw. This will ensure that the parking brake is engaged when the accelerator pedal is pressed.

5. Unlock the current settings of the power train pumps in your IQAN system. See "Unlock Current Settings".

Unlock Current Settings

You must use a PC that is equipped with IQANtalk software and an electronic key must be used in order to display the "XMSN" option in the "Maintenance" menu.

1. Connect the serial cable between your PC and the IQAN system of your machine.

2. Turn the engine start switch key to the ON position.

3. Select "Hydrostat" from the "Function" menu. The following window will appear.

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Illustration 2	g00939804
(A) "Trim transm." (B) "Send F2" (C) "Get F3" (D) "Close F6"

4. Select "Get F3" (C) or press "F3" in order to retrieve the current parameters for the "Hydrostat" option.

5. Change the value for the "Trim transm." parameter (A) to a value of "1".

6. Select "Send F2" (B) or press "F2" in order to send the current parameters for the "Hydrostat" option. This will allow the "XMSN" in the "Maintenance" menu to be adjusted on your IQAN display.

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Illustration 3	g00940190

7. Select "XMSN" from the "Maintenance" menu in order to adjust the hydrostatic transmission for the front and rear drive loop. The following window will appear.

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Illustration 4	g00953326

8. Use the IQAN screen for changing the current settings for the proportional solenoids on the power train pump.

9. Adjusting the minimum current settings for the front drive loop and the rear drive loop

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Illustration 5	g00859646
IQAN Terminal (Main Menu) (1) Arrow key. (2) Arrow key. (3) Arrow key. (4) Arrow key. (5) Menu key. (6) Function key.

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Illustration 6	g00892178
IQAN Screen (Current settings to the proportional solenoids on the power train pump) (7) Output current to the front and the rear power train pump solenoids. (8) Maximum current settings forward direction. (9) Display for the current pressure of the front drive loop and the rear drive loop in the forward direction. (10) Minimum current settings forward direction. (11) Display for the current pressure of the front drive loop and the rear drive loop in the reverse direction. (12) Maximum current settings reverse direction. (13) Minimum current settings reverse direction.

10. Press the function key that corresponds to the desired item. Function key "F1" corresponds to the maximum current setting for the front power train pump and the rear power train pump when the machine is moving forward direction.

    Function key "F2" corresponds to the minimum current setting (10) for the front power train pump and the rear power train pump in the forward direction.

    Function key "F3" corresponds to the maximum current setting (12) for the front power train pump and the rear power train pump in the reverse direction.

    Function key "F4" corresponds to the minimum current setting (13) for the front power train pump and the rear power train pump in the reverse direction.

    Set the minimum current of the front and rear drive loop (Forward and Reverse) to 145 mA (150 ± 10 mA).

    Note: Write down the values before you change the minimum current settings.

11. Use the arrow keys in order to adjust the minimum current values on the IQAN display.
    • Press the "up" arrow key (3) in order to increase the current setting for the front and rear drive loop.

    • Press the "down" arrow key (2) in order to decrease the current setting for the front and rear drive loop.

    • Press the "left" arrow key (1) in order to increase the current setting for the rear drive loop and decrease the current setting for the front drive loop.

    • Press the "right" arrow key (4) in order to increase the current setting for the front drive loop and decrease the current setting for the rear drive loop.

    Note: Pressing the "left" arrow key (1) or pressing the "right" arrow key (4) changes the relation between the rear and front drive loop. When you press arrow key (1) the value of the front drive loop will be decreased and the value of the rear drive loop will be increased by the same amount.

    Note: Press the "up" arrow key (3) in order to increase the values simultaneously of both drive loops and by the same amount. Press the "down" arrow key (2) in order to decrease the values simultaneously of both drive loops and by the same amount.

12. After you perform the test, set the values for the minimum current of the front and rear drive loop (Forward and Reverse) to the original values. Change the value for the "Trim transm." parameter (1) to a value of "0" after you finish adjusting the values. This will avoid unauthorized adjustments.

Test

You must monitor the pressure reading in the drive loop that corresponds to the minimum current that was adjusted for this test.

Front Power Train Pump

1. Forward

   1. Start the engine. Turn the machine speed potentiometer to 100.

   2. Place the operating mode switch in the WORKING MODE position.

   3. Increase the engine speed to 1500 rpm with the engine speed potentiometer.

   4. Monitor the pressure in display (9). The pressure should read 20 ± 2 Bar. This is the pressure of the charge pump.
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   Illustration 7	g00892178

   5. Press the "F2" key. This will highlight the minimum current setting (10) .

      Note: Function key "F2" corresponds to minimum current setting (10) for the front power train pump and the rear power train pump in the forward direction.

   6. Depress the accelerator pedal halfway.

   7. Press the "right" arrow key (4) in order to increase the current setting for the front drive loop (forward). This will decrease the minimum current to the rear drive loop (forward).

   8. Monitor the pressure in display (9) as you increase the minimum current by pressing the "right" arrow key (4). As the pressure in the front drive loop (forward) starts to increase to 400 kPa (60 psi) in display (9), stop increasing the current. Read the current output in display (7) to the front power train pump.

      Note: When the pressure in display (9) is 400 kPa (60 psi) the power train pump starts to upstroke. When the pressure in display (9) starts to increase the minimum current is reached in order to start to upstroke the pump. The current should be 170 ± 10 mA.

   9. Release the accelerator pedal.

   10. Press the "left" arrow key (1) in order to decrease the current setting for the front drive loop to 145 mA.

2. Reverse

   1. Place the operating mode switch in the WORKING MODE position.

   2. Monitor the pressure in display (11). The pressure should read 20 ± 2 Bar. This is the pressure of the charge pump.
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   Illustration 8	g00892178

   3. Press the "F4" key. This will highlight the minimum current setting (13) .

      Note: Function key "F4" corresponds to minimum current setting (13) for the front power train pump and the rear power train pump in the reverse direction.

   4. Hold down the reverse pedal and depress the accelerator pedal halfway.

   5. Press the "right" arrow key (4) in order to increase the minimum current setting for the front drive loop (reverse).

   6. Monitor the pressure in display (11) as you increase the minimum current by pressing the "right" arrow key (4). When the pressure in the front drive loop (forward) starts to increase to 400 kPa (60 psi) in display (11), you should stop increasing the current. Read the current output in display (7) to the front power train pump. Monitor the minimum current output in display (7). The minimum current should be 170 ± 10 mA.

   7. Release the accelerator pedal.

   8. Press the "left" arrow key (1) in order to decrease the current setting for the front drive loop to 145 mA.

3. Place the WORKING MODE switch in the NEUTRAL position.

4. Stop the engine.

   Note: The difference between the minimum current for the front drive loop in FORWARD and REVERSE should be ± 10 mA.

5. If the difference between the minimum current of the front drive loop for the FORWARD and REVERSE directions is out-of-range, perform Step 6 and Step 7.

6. Disconnect the oil lines that connect to the two work ports of the power train pump. Use the covers and the rectangular seals to block the work ports on the power train pump.

7. Repeat Step 1 and Step 2.

   Note: The difference between the minimum current of the front drive loop FORWARD and REVERSE directions should be ± 10 mA. If the difference between the two current readings is within the correct range, the source of the leakage is most likely from the power train motor. If the difference between the two current readings is not within the correct range, the source of the leakage is most likely from the power train pump or the neutral position of the power train pump needs to be adjusted.

Rear Power Train Pump

1. Forward

   1. Start the engine. Turn the machine speed potentiometer to 100.

   2. Place the operating mode switch in the WORKING MODE position.

   3. Increase the engine speed to 1500 rpm with the engine speed potentiometer.

   4. Monitor the pressure in display (9). The pressure should read 20 ± 2 Bar. This is the pressure of the charge pump.
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   Illustration 9	g00892178

   5. Press the "F2" key. This will highlight the minimum current setting (10) .

      Note: Function key "F2" corresponds to minimum current setting (10) for the front power train pump and the rear power train pump in the forward direction.

   6. Depress the accelerator pedal halfway.

   7. Press the "left" arrow key (1) in order to increase the minimum current setting for the rear drive loop (forward) and decrease the current setting for the front drive loop.

   8. Monitor the pressure in display (9) as you increase the minimum current by pressing the "left" arrow key (1). When the pressure in the rear drive loop (forward) starts to increase to 400 kPa (60 psi) in display (9), stop increasing the current. Read the current output in display (7) to the rear power train pump.

      Note: When the pressure in display (9) is 400 kPa (60 psi) the power train pump starts to upstroke. When the pressure in display (9) starts to increase the minimum current is reached in order to start to upstroke the pump. The current should be 170 ± 10 mA.

   9. Release the accelerator pedal.

   10. Press the "right" arrow key (4) in order to decrease the current setting for the rear drive loop to 145 mA.

2. Reverse

   1. Place the operating mode switch in the WORKING MODE position.

   2. Monitor the pressure in display (11). The pressure should read 20 ± 2 Bar. This is the pressure of the charge pump.
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   Illustration 10	g00892178

   3. Press the "F4" key. This will highlight the minimum current setting (13) .

      Note: Function key "F4" corresponds to minimum current setting (13) for the front power train pump and the rear power train pump in the forward direction.

   4. Hold down the reverse pedal and depress the accelerator pedal halfway.

   5. Press the "right" arrow key (4) in order to decrease the current setting for the rear drive loop (reverse) to 145 mA.

   6. Monitor the pressure in display (11) as you increase the minimum current by pressing the "left" arrow key (1). When the pressure in the rear drive loop (reverse) starts to increase to 400 kPa (60 psi) in display (11) stop increasing the current. Read the current output in display (7) to the rear power train pump.

      Note: When the pressure in display (11) is 400 kPa (60 psi) the power train pump is starting to upstroke. When the pressure in display (11) starts to increase the minimum current is reached in order to start to upstroke the pump. The current should be 170 ± 10 mA.

   7. Release the accelerator pedal.

   8. Press the "right" arrow key (4) in order to decrease the current setting for the rear drive loop to 145 mA.

3. Place the WORKING MODE switch in the NEUTRAL position.

4. Stop the engine.

   Note: The difference between the minimum current for the rear drive loop FORWARD and REVERSE should be ± 10 mA.

5. If the difference between the minimum current of the rear drive loop for the FORWARD and REVERSE directions is out-of-range, perform Step 6 and Step 7.

6. Disconnect the oil lines that connect to the two work ports of the power train pump. Use the covers and the rectangular seals to block the work ports on the power train pump.

7. Repeat Step 1 and Step 2.

   Note: The difference between the minimum current of the rear drive loop FORWARD and REVERSE directions should be ± 10 mA. If the difference between the two current readings is within the correct range, the source of the leakage is most likely from the power train motor. If the difference between the two current readings is not within the correct range, the source of the leakage is most likely from the power train pump or the neutral position of the power train pump needs to be adjusted.