574B Forwarder Power Train Caterpillar

The machine has a hydrostatic drive loop. The drive loop is a closed loop circuit.

The drive loop uses hydraulic oil from the power train pump. The IQAN controls the oil flow from the power train pump to the power train motor.

The power train pump has a maximum current setting and a minimum current setting for the forward direction and the reverse direction.

Preparation for Adjustment

The current settings for the options in the "Maintenance" menu are locked at the factory. A PC that is equipped with IQANtalk software must be used to unlock these current settings for adjustment.

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Illustration 1	g00915930
IQANtalk Connection

1. Connect a serial cable between your PC and the IQAN system of your machine. The IQANtalk connection is a 9-pin connector that is located behind the rear access panel in the cab.

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

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Illustration 2	g00915955

3. Select "Get" from "System" menu (1) or select icon (2) in order to receive the current parameters from your IQAN system.

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Illustration 3	g00915956

4. Select "Hydrostat" from "Function" menu (3). The following window will appear.

5. Change the value for the "Trim transm." (4) to a value of "1".

6. Select "Send F2" (5) or press "F5" in order to send the current parameters for the "Hydrostat" option. This will allow the "XMSN pump" option and the "XMSN motor" in the "Maintenance" menu to be adjusted on your IQAN display.

Power Train Pump - Test and Adjust

Minimum Current - Test

This test ensures that the machine begins to move soon after you press the accelerator pedal. The minimum current setting of the proportional solenoid on the power train pump controls when the power train motor begins to send oil through the drive loop.

1. If your machine has chains or tracks that are mounted on the tires, remove the chains or the tracks.

2. Ensure that the hydraulic oil in the system is at normal operating temperature.

3. Start the engine. Move the machine to a smooth level surface. Be sure that all wheels are on the ground.

4. Press the operating mode switch in order to activate the working mode.

   Note: The operating mode switch will light in the working mode.

5. Place the machine speed potentiometer to the maximum setting.

Forward

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Illustration 4	g00871793
(1) Direction selector switch. (2) Gear selector switch.

1. Place direction selector switch (1) in the FORWARD position.

2. Press gear selector switch (2) to "L" once in order to downshift to low speed. Gear speed is indicated on the IQAN screen.

3. Press the bottom of parking brake switch in order to disengage the parking brake.

4. Slowly depress the accelerator pedal. The machine should begin to move when the following conditions are met.
   • The accelerator is depressed.

   • The engine rpm speed is above 950.

   • The machine begins to move when the accelerator pedal is pressed further.

5. If the conditions in Step 4 were not met, refer to ""XMSN pump" Current - Adjust" for adjustment procedures.

Reverse

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Illustration 5	g00871793
(1) Direction selector switch. (2) Gear selector switch.

1. Place direction selector switch (1) in the REVERSE position.

2. Press gear selector switch (2) to "L" once in order to downshift to low speed. Gear speed is indicated on the IQAN screen.

3. Press the bottom of parking brake switch in order to disengage the parking brake.

4. Slowly depress the accelerator pedal. The machine should begin to move when the following conditions are met.
   • The accelerator is depressed.

   • The engine rpm speed is above 950.

   • The machine begins to move when the accelerator pedal is pressed further.

5. If the conditions in Step 4 were not met, refer to ""XMSN pump" Current - Adjust" for adjustment procedures.

"XMSN pump" Current - Adjust

The following procedure uses the IQAN to adjust the minimum current and the maximum current to the power train pump.

Note: The current settings of the power train pump are locked at the factory. A PC that is equipped with IQANtalk software must be used to unlock these current settings for adjustment. See "Preparation for Adjustment".

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Illustration 6	g00916000
IQAN Terminal (Main Menu) (6) Menu key.

1. At the main menu of the IQAN display, press menu key (6) and then press the right arrow key. The following screen will appear.

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Illustration 7	g00916015

2. Press the function key beside the "Maintenance" option. The following window will appear.

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Illustration 8	g00916018

3. Press the function key beside the "XMSN pump" option.

"Min forward" - Adjust

This is the minimum current setting for the power train pump in the forward direction. The minimum current should be adjusted so that the machine does not move during the initial movement of accelerator pedal. When the accelerator pedal is pushed slightly more the machine should begin to move. If the minimum current is too high, the machine will jump when you move the accelerator pedal. If the minimum current is too low the accelerator pedal must be moved excessively in order to begin the movement of the machine.

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Illustration 9	g00916029

1. Press the function key beside the "Min forward" option. This will activate the field.

2. Start the engine.

3. Press the operating mode switch in order to activate the working mode.

4. Place the machine speed potentiometer to the maximum setting.

5. Place the direction selector switch in the FORWARD position.

6. Depress the accelerator until the engine reaches 1250 ± 50 rpm.

7. Increase or decrease the "Min forward" value by 1 mA at a time until the machine begins to roll forward slightly.

   Note: Observe the tire in order to perform this test.

8. Press the right arrow key in order to increase the current setting. Press the left arrow key in order to decrease the current setting.

   If the current setting is decreased, the machine will begin to move sooner. If the current setting is increased the machine will begin to move later.

9. Reduce the setting for the "Min forward" value by an additional 5 mA after the adjustment is complete.

"Min reverse" - Adjust

This is the minimum current setting for the power train pump in the reverse direction. The minimum current should be adjusted so that the machine does not move during the initial movement of the accelerator pedal. When the accelerator pedal is pushed slightly more the machine should begin to move. If the minimum current is too high, the machine will jump when you move the accelerator pedal. If the minimum current is too low the accelerator pedal must be moved excessively in order to begin the movement of the machine.

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Illustration 10	g00916029

1. Press the function key beside the "Min reverse" option. This will activate the field.

2. Start the engine.

3. Press the operating mode switch in order to activate the working mode.

4. Place the machine speed potentiometer to the maximum setting.

5. Place the direction selector switch in the REVERSE position.

6. Depress the accelerator until the engine reaches 1250 ± 50 rpm.

7. Increase or decrease the "Min reverse" value by 1 mA at a time until the machine begins to roll backward slightly.

   Note: Observe the tire in order to perform this test.

8. Press the right arrow key in order to increase the current setting. Press the left arrow key in order to decrease the current setting.

   If the current setting is decreased, the machine will begin to move sooner. If the current setting is increased the machine will begin to move later.

9. Reduce the current setting for the "Min reverse" value by an additional 5 mA after the adjustment is complete.

"Max forward" - Adjust

This is the maximum current setting for the power train pump in the forward direction. When the accelerator pedal reaches the end of travel and the maximum speed potentiometer is set to 100%, the maximum current will flow from the IQAN. The maximum current should be adjusted so that the maximum speed of the machine corresponds to maximum travel of the accelerator pedal. If the maximum current is set too high, the accelerator pedal will not move all the way to reach maximum speed. If the maximum current is set too low, the machine will not move at maximum speed.

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Illustration 11	g00916029

1. Press the function key beside the "Max forward" option. This will activate the field.

2. Start the engine.

3. Press the operating mode switch in order to activate the working mode.

4. Place the machine speed potentiometer to the maximum setting.

5. Place the direction selector switch in the FORWARD position.

6. Road the machine on a hard, level surface. When possible, use a paved road.

7. Press the accelerator to the floor. Read the "PT Motor" rpm reading that is displayed on the IQAN screen.

8. Increase the "Max forward" setting by using the right arrow key until the "PT motor" rpm reading does not increase.

"Max reverse" - Adjust

This is the maximum current setting for the power train pump in the reverse direction. When the accelerator pedal reaches the end of travel and the maximum speed potentiometer is set to 100%, the maximum current will flow from the IQAN. The maximum current should be adjusted so that the maximum speed of the machine corresponds to maximum travel of the accelerator pedal. If the maximum current is set too high, the accelerator pedal will not move all the way to reach maximum speed. If the maximum current is set too low, the machine will not move at maximum speed.

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Illustration 12	g00916029

1. Press the function key beside the "Max reverse" option. This will activate the field.

2. Start the engine.

3. Press the operating mode switch in order to activate the working mode.

4. Place the machine speed potentiometer to the maximum setting.

5. Place the direction selector switch in the REVERSE position.

6. Road the machine on a hard, level surface. When possible, use a paved road.

7. Press the accelerator to the floor. Read the "PT Motor" rpm reading of the power train motor that is displayed on the IQAN screen.

8. Increase the "Max reverse" setting by using the right arrow key until the "PT motor" rpm reading does not increase.

Power Train Motor - Adjust

"XMSN motor" Current - Adjust

The following procedure uses the IQAN to adjust the minimum current and the maximum current to the power train motor.

When the Forwarder is shifted to low speed, the maximum speed setting of the power train motor in low speed is 3200 ± 50 rpm. When the Forwarder is shifted into high speed, the maximum speed setting of the power train motor in high speed is 2350 ± 50 rpm.

Note: The current settings of the power train pump are locked at the factory. A PC that is equipped with IQANtalk software must be used to unlock these current settings for adjustment. See "Preparation for Adjustment".

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Illustration 13	g00916000
IQAN Terminal (Main Menu) (6) Menu key.

1. At the main menu of the IQAN display, press menu key (6) and then press the right arrow key. The following screen will appear.

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Illustration 14	g00916015

2. Press the function key beside the "Maintenance" option. The following window will appear.

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Illustration 15	g00916359

3. Press the function key beside the "XMSN motor" option.

"Mincurrent" - Adjust

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1. Press the function key beside the "Mincurrent" option. This will activate the field. Set the "Mincurrent" value to 190 mA.

2. Start the engine.

3. Press the operating mode switch in order to activate the working mode.

4. Place the machine speed potentiometer to the maximum setting.

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Illustration 17	g00871793
(1) Direction selector switch. (2) Gear selector switch.

5. Place direction selector switch (1) in the FORWARD position.

6. Press the bottom of the parking brake switch in order to disengage the parking brake.

7. Depress the accelerator pedal to the floor.

8. Use the right arrow key in order to increase the "Mincurrent" value. Increase the "Mincurrent" value until the "PT motor" rpm reading begins to increase. Stop increasing the "Mincurrent" value.

9. Reduce the setting for the "Mincurrent" value by an additional 5 mA after the adjustment is complete. The setting for the "Mincurrent" value is not correct.

"Max lowgear" - Adjust

Illustration 18	g00916361

1. Press the function key beside the "Max lowgear" option. This will activate the field.

2. Start the engine.

3. Press the operating mode switch in order to activate the working mode.

4. Place the machine speed potentiometer to the maximum setting.

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Illustration 19	g00871793
(1) Direction selector switch. (2) Gear selector switch.

5. Place direction selector switch (1) in the FORWARD position.

6. Press gear selector switch (2) to "L" once in order to downshift to low speed. Gear speed is indicated on the IQAN screen.

7. Press the bottom of the parking brake switch in order to disengage the parking brake.

8. Depress the accelerator pedal to the floor.

9. Use the arrow keys in order to adjust the "Max lowgear" value until the "PT motor" rpm reading is 2950 ± 50 rpm. The setting for the "Max lowgear" value is now correct.

"Max highgear" - Adjust

Illustration 20	g00916361

1. Press the function key beside the "Max highgear" option. This will activate the field.

2. Start the engine.

3. Press the operating mode switch in order to activate the working mode.

4. Place the machine speed potentiometer to the maximum setting.

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Illustration 21	g00871793
(1) Direction selector switch. (2) Gear selector switch.

5. Place direction selector switch (1) in the FORWARD position.

6. Press gear selector switch (2) to "H" once in order to upshift to high speed. Gear speed is indicated on the IQAN screen.

7. Press the bottom of the parking brake switch in order to disengage the parking brake.

8. Depress the accelerator pedal to the floor.

9. Use the arrow keys in order to adjust the "Max highgear" value until the "PT motor" rpm reading is 2350 ± 50 rpm. The setting for the "Max highgear" value is now correct.