550 Wheel Harvester, 570 Wheel Harvester and 580 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.

Preparation for Testing

You must use a PC that is equipped with IQANtalk software and an electronic key must be used in order to display the "XMSN FR" option and the "XMSN RR" 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	g00892336
(1) "Trim transm." (2) "Send F2" (3) "Get F3" (4) "Close F6"

4. Select "Get F3" (3) or press "F3" in order to retrieve the current parameters for the "Hydrostat" option.

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

6. Select "Send F2" (2) or press "F2" in order to send the current parameters for the "Hydrostat" option. This will allow the "XMSN FR" and the "XMSN RR" in the "Maintenance" menu to be adjusted on your IQAN display.

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Illustration 3	g00924720

7. Select icon (5) or "Block diagram" in the "Channels" menu in order to show the block diagram.

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Illustration 4	g00974881

8. Select the "MG" tab at the bottom of the block diagram.

9. Select the following channels in the block diagram with the right mouse button in order to activate the channels for a measurement.
   • "HP FWD front" (6)

   • "HP REV front" (7)

   • "HP FWD rear" (8)

   • "HP REV rear" (9)

   • "Charge" (10)

   Note: A block beside the name of the channel indicates that the channel has been selected for a measurement.

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Illustration 5	g00924735

10. Select the "Selected" option from the "Measure" menu. The following window will appear.

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Illustration 6	g00974984

11. Select "Measure" button (11) or press the "F4" key in order to begin a measurement of the selected channels. Now, you are ready to test the hydrostatic drive system of the forward travel and the reverse travel.

    "HP FWD front" (6) - This channel measures the pressure of the front power train pump in the forward direction.

    "HP REV front" (7) - This channel measures the pressure of the front power train pump in the reverse direction.

    "HP FWD rear" (8) - This channel measures the pressure of the rear power train pump in the forward direction.

    "HP REV rear" (9) - This channel measures the pressure of the rear power train pump in the reverse direction.

    "Charge" (10) - This channel measures the pressure of the charging system.

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Illustration 7	g00975022
(12) "GOV Setup". (13) "XMSN FR". (14) "XMSN RR".

12. Select "XMSN FR" (13) from the "Maintenance" menu in order to adjust the hydrostatic transmission for the front drive loop. Select "XMSN RR" (14) from the "Maintenance" menu in order to adjust the hydrostatic transmission for the rear drive loop. The following window will appear.

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Illustration 8	g00975042

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

    Note: 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 is 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 at "HP FWD front" (6) and "Charge" (10). The pressure should read 20 ± 2 Bar. This is the pressure of the charge pump.

   5. Select "XMSN FR" (13) from the "Maintenance" menu in order to adjust the hydrostatic transmission for the front drive loop.
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   Illustration 9	g00975042

   6. Press the "F2" key. This will highlight the minimum current setting (18) .

   7. Depress the accelerator pedal halfway.

   8. Press the "right" arrow key in order to increase the current setting for the front drive loop (forward).

   9. Monitor the pressure at "HP FWD front" (6) as you increase the minimum current by pressing the "right" arrow key. As the pressure at "HP FWD front" (6) starts to increase to 40 Bar, stop increasing the current. Read the current output in display (16) to the front power train pump. The minimum current should be 170 ± 10 mA.

      Note: When the pressure at "HP FWD front" (6) is 40 Bar the power train pump starts to upstroke. When the pressure at "HP FWD front" (6) starts to increase the minimum current is reached in order to start to upstroke the pump. The current should be 170 ± 10 mA.

   10. Release the accelerator pedal.

   11. Press the "left" arrow key 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 at "HP REV front" (7) and "Charge" (10). The pressure should read 20 ± 2 Bar. This is the pressure of the charge pump.

   3. Select "XMSN FR" (13) from the "Maintenance" menu in order to adjust the hydrostatic transmission for the front drive loop.
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   Illustration 10	g00975042

   4. Press the "F4" key. This will highlight the minimum current setting (20) .

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

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

   7. Monitor the pressure at "HP REV front" (7) as you increase the minimum current by pressing the "right" arrow key. As the pressure at "HP REV front" (7) starts to increase to 40 Bar, stop increasing the current. Read the current output in display (16) to the front power train pump. The minimum current should be 170 ± 10 mA.

   8. Release the accelerator pedal.

   9. Press the "left" arrow key 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 (A) and the rectangular seals (B) 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 at "HP FWD rear" (8) and "Charge" (10). The pressure should read 20 ± 2 Bar. This is the pressure of the charge pump.

   5. Select "XMSN RR" (14) from the "Maintenance" menu in order to adjust the hydrostatic transmission for the front drive loop.
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   Illustration 11	g00975042

   6. Press the "F2" key. This will highlight the minimum current setting (18) .

   7. Depress the accelerator pedal halfway.

   8. Press the "right" arrow key in order to increase the current setting for the rear drive loop (forward).

   9. Monitor the pressure at "HP FWD rear" (8) as you increase the minimum current by pressing the "right" arrow key. As the pressure at "HP FWD rear" (8) starts to increase to 40 Bar, stop increasing the current. Read the current output in display (16) to the rear power train pump. The minimum current should be 170 ± 10 mA.

      Note: When the pressure at "HP FWD rear" (8) is 40 Bar the power train pump starts to upstroke. When the pressure at "HP FWD rear" (8) starts to increase the minimum current is reached in order to start to upstroke the pump. The current should be 170 ± 10 mA.

   10. Release the accelerator pedal.

   11. Press the "left" arrow key 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 at "HP REV rear" (9) and "Charge" (10). The pressure should read 20 ± 2 Bar. This is the pressure of the charge pump.

   3. Select "XMSN RR" (14) from the "Maintenance" menu in order to adjust the hydrostatic transmission for the rear drive loop.
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   Illustration 12	g00975042

   4. Press the "F4" key. This will highlight the minimum current setting (20) .

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

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

   7. Monitor the pressure at "HP REV rear" (9) as you increase the minimum current by pressing the "right" arrow key. As the pressure at "HP REV rear" (9) starts to increase to 40 Bar, stop increasing the current. Read the current output in display (16) to the rear power train pump. The minimum current should be 170 ± 10 mA.

   8. Release the accelerator pedal.

   9. Press the "left" arrow key 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 rear drive loop in 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 (A) and the rectangular seals (B) 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.