D6T Track-Type Tractor Systems Hydraulic Fan Speed (On Demand) - Test and Adjust Caterpillar

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Hydraulic oil pressure can remain in the hydraulic system on this machine after the engine and pump have been stopped. Serious injury can result if this pressure is not released before any service is done on the hydraulic systems. In order to prevent possible injury, release the hydraulic system pressure before working on any fitting, hose, or hydraulic component. Lower all attachments to the ground before service is started. If the hydraulic system must be serviced, tested, or adjusted with the attachment in the raised position, the attachments and lift cylinders must be supported properly. Always move the machine to a location away from the travel of other machines. Be sure that other personnel are not near the machine when the engine is running and tests or adjustments are being made.

Specifications

Introduction

Reference: Refer to each specific section for an introduction to the test, adjustment, and calibration procedures.

Procedures

This procedure includes the following calibrations:

• "Test Procedure (Fan Speed)"

• "Fan Speed Calibration"

This procedure includes the following tests:

• "Test Procedure (Fan Speed)"

This procedure includes the following adjustment procedures:

• "Adjustment Procedure (Maximum Mechanical High Pressure)"

• "Adjustment Procedure (Minimum Mechanical High Pressure)"

Definitions

0.02 Amps - Minimum fan pump control current allowed by the fan control software

Fan Speed at 0.02 Amps - The highest fan speed the system is capable of producing. This speed is set by the fan pump cutoff adjustment.

1.6 Amps - Maximum fan pump control current allowed by the fan control software.

Fan Speed at 1.6 Amps - The lowest fan speed the system is capable of producing. This speed is set by the fan pump margin adjustment.

Calibrated Minimum Current - The current being sent to the fan pump by the fan controller at 100% fan bypass.

Calibrated Minimum Speed - The fan speed at 100% fan bypass.

Calibrated Clip Current - The current being sent to the fan pump by the controller at 0% fan bypass.

Calibrated Clip Speed - The fan speed at 0% fan by pass.

Required Tools

Illustration 1	g02478137
Tooling (D)

Reference: Refer to Tool Operating Manual, NEHS1087 for operating instructions for the 348-5430 Multi-Tool Gp.

Note: Use Software License Card, NETG5049 with part number 348-5430 Multi-Tool Gp.

Machine Set Up

1. Move the machine to a smooth horizontal location.

2. Lower all the implements.

3. Shut off the engine.

Fan Speed Correction Factor Calculation

Introduction

This procedure is used to correct the factory maximum, minimum and clip speed targets. These corrections are for the ambient air pressure and temperature in which the machine is being serviced.

Procedure

The fan speeds can be found in Table 1.

1. Perform the steps in the "Machine Set Up" and then continue to the following steps.

2. Connect the Electronic Technician to the diagnostic port on the tractor.

3. Click the "Status" tab in Electronic Technician.

4. Choose "Engine Pressures". Record the atmospheric pressure, this value will be used later in the procedure.

5. Record the ambient temperature displayed under "Engine Temperatures". The approximate ambient air temperature will be used later in the procedure.

6. Use the atmospheric pressure and the ambient air temperature noted in Step 4 and Step 5 in Table 4. This table identifies the correct factor for current location and ambient conditions.

   Reference: The fan speed correction factor table is located in table 4.

7. Record this correction factor in Table 1.

8. To get a corrected fan speed, multiply the fan speed from Table 1 by the correction factor recorded in Table 1.

   Reference: See Table 3 for an example.

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   Table 3

   Example

   D6T with a 30 degree standard 246-0616 Fan Spider As

   Target clip speed from Table 1 is 1550 RPM.

   Ambient temperature of 20° C (68 ° F)

   Atmospheric pressure of 95 kPa (13.78 psi)

   The recorded correction factor from Table 1 is 1.02.

   The corrected target clip speed is: 1550 RPM × 1.02 = 1550 ± 50

9. Perform the steps in the "Fan Speed Calibration" using the new corrected fan speed instead of the default value stated in ET.

Test Procedure (Fan Speed)

Introduction

This procedure utilizes the "Engine Cooling Fan Calibration" tool in Electronic Technician (ET) to drive 0.02 Amps and 1.6 Amps. These specific currents are driven to verify that the "Maximum Mechanical High Pressure" and "Minimum Mechanical Pressure" pump adjustments are properly set. This test also ensures that a successful fan speed calibration can be performed.

Procedure

1. Assemble tooling (D).

2. Attach tooling (D) to the grill to measure the fan speed.

3. Connect Electronic Technician (ET) to the diagnostic port on the tractor.

4. Engage the parking brake.

5. Start the engine. Warm the hydraulic oil to a temperature of 60° ± 3°C (140° ± 5°F). Run the engine for at least 5 minutes to stabilize the air temperature.

6. Set the implement lockout switch to the LOCKED position.

7. Use Electronic Technician for the following procedure:

   1. Select the Engine ECM.

   2. Click the Service tab.
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      Illustration 2	g02354856

   3. Select "Calibrations".
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      Illustration 3	g02354859

   4. Select "Engine Cooling Fan Calibration".

   5. Select only the "Engine Cooling Fan Maximum Speed" calibration.

      Note: Deselect the other two calibrations.

   6. Follow the onscreen instructions and complete the "Set up calibration conditions" only.

   7. Refer to "Fan Speed at 0.02 Amps" for maximum fan speed test. Refer to "Fan Speed at 1.6 Amps" for minimum fan speed test.

Fan Speed at 0.02 Amps

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Illustration 4	g02354898

1. Use the increment and decrement buttons at the bottom of the screen to adjust the fan current
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   Illustration 5	g02354896

2. Use the buttons to move the slide bar (1) until the current is set to 0.02 Amps or all the way to the left.

3. Check fan speed at tooling (D). The maximum recommended fan speed should be 1550 to 2000 RPM.

   Note: If the fan speeds are not within specifications. Refer to "Adjustment Procedure (Maximum Mechanical High Pressure)" for mechanical adjustment.

   Note: Achieving the desired maximum fan speed indicates that the fan pump is properly set and no further adjustments are needed.

4. Proceed to "Fan Speed at 1.6 Amps".

Fan Speed at 1.6 Amps

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Illustration 6	g02354898

1. Use the increment and decrement buttons at the bottom of the screen to adjust the fan current
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   Illustration 7	g02354978

2. Use the buttons to move the slide bar (1) until the current is set to 1.6 Amps or all the way to the right.

3. Check fan speed at tooling (D). The minimum recommended fan speed should be 450 to 700 RPM.

   Note: If the fan speeds are not within specifications. Refer to "Adjustment Procedure (Minimum Mechanical High Pressure)" for mechanical adjustment.

   Note: Achieving the desired minimum fan speed indicates that the fan pump is properly set and no further adjustments are needed.

4. Select the cancel button at the bottom of the screen to cancel "Engine Cooling Fan Maximum Speed" calibration.

Adjustment Procedure (Maximum Mechanical High Pressure)

1. Perform the steps in the "Machine Set Up" and then continue to the following steps.

2. Remove the rear belly guard to gain access to the fan pump controller.
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   Illustration 8	g02338580
   (2) Fan Pump Controller

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   Illustration 9	g02338581
   Close up view of the fan pump controller (2) Fan Pump Controller (3) Locknut (4) Adjustment Screw

3. Remove cap from adjustment screw (4).

4. Hold adjustment screw (4) in place and loosen locknut (3).

5. Turn adjustment screw (4) clockwise to increase the pressure setting or turn adjustment screw (4) counterclockwise to decrease the pressure setting.

6. Hold adjustment screw (4) in place and tighten locknut (3).

7. Check the fan speed at tooling (D) by performing the Steps in "Test Procedure (Fan Speed)".

Note: The maximum mechanical adjustment and the minimum mechanical adjustment influence each other. Whenever you adjust one setting, always check the other setting and then make any necessary adjustment.

Adjustment Procedure (Minimum Mechanical High Pressure)

1. Perform the steps in the "Machine Set Up" and then continue to the following steps.

2. Remove the rear belly guard to gain access to the fan pump controller.
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   Illustration 10	g02338580
   (2) Fan Pump Controller

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   Illustration 11	g02338598
   Close up view of the fan pump controller (2) Fan Pump Controller (3) Locknut (4) Adjustment Screw for Maximum Mechanical Fan Pump Pressure

3. Remove cap from adjustment screw (4).

4. Turn adjustment screw (4) clockwise to increase the pressure setting or turn adjustment screw (4) counterclockwise to decrease the pressure setting.

5. Hold adjustment screw (4) in place and loosen locknut (3).

6. Check the fan speed at tooling (D) by performing the Steps in "Test Procedure (Fan Speed)".

7. Hold adjustment screw (4) in place and tighten locknut (3).

Note: The maximum mechanical pump pressure adjustment and the minimum pump pressure adjustment influence each other. Whenever you adjust one pressure, always check the other pressure and then make any necessary adjustment.

Fan Speed Calibration

Introduction

The "Fan Speed Calibration" procedure is used to set the fan current working range to be utilized during normal fan system operation.

Note: The "Fan Speed Bypass" tool in ET allows for manual control of fan speed within the calibrated fan speed working range while ET is in use. The "Fan Speed Bypass" tool is not used to evaluate the "Maximum Mechanical High Pressure" or "Minimum Mechanical Pressure" settings of the pump. This tool will not drive the fan control current to the level needed to conduct these evaluations properly.

Procedure

1. Perform the steps in the "Machine Set Up" and then continue to the following steps.

2. Prepare the Multitach Tool Gp (D) to measure fan speed.

3. Connect the Electronic Technician to the diagnostic port on the tractor.

4. Engage the parking brake.

5. Start the engine. Warm the hydraulic oil to a temperature of 60° ± 3°C (140° ± 5°F).

6. Set the implement lockout switch to the LOCKED position.

7. Click the Service tab.

8. Select "Calibration".

9. Select "Engine Cooling Fan Calibration".

   Note: There are three different calibrations to run. Follow the onscreen instructions to perform the fan calibrations.

10. Use tooling (D) to monitor the fan speed.

Correction Factor