D6N Track-Type Tractor Power Train Caterpillar

Introduction

The torque converter inlet relief valve limits the maximum pressure to the torque converter section of the torque divider. The torque converter inlet relief valve also prevents damage to the torque converter when the engine is started and the oil is cold.

The following test will check the maximum pressure of the oil that is delivered to the torque converter section of the torque divider.

Required Tools

Illustration 1	g01089423

Test Procedure (Cold Oil Start-up)

The torque converter inlet relief valve prevents damage to the torque converter when the engine is started and the oil is cold. At that time, the relief valve limits the maximum oil pressure to the torque converter. The torque converter inlet relief valve is not designed to limit pressure after normal operating temperatures are reached.

Note: Do not allow the machine to reach the normal operating temperature before you measure the pressure. Make observations based on the measurement when the oil is cold.

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Illustration 2	g01263974

1. Attach the gauge (A) to pressure tap (M).

2. Start the engine and run the engine at HIGH IDLE.

3. Observe the pressure on the gauge. The pressure should not exceed 895 kPa (130 psi).

4. Replace the valve if the valve is non-functioning or the valve is out of the spec.

Test Procedure (Normal Operating Temperatures)

Note: This test is designed to measure the torque converter inlet pressure. This test is not designed to measure the pressure setting of the torque converter inlet relief valve. However, a malfunctioning inlet relief valve can cause the pressure to be out of the specification. See the Troubleshooting section of this manual for more information.

1. Attach the gauge to pressure tap (M).

2. Warm the transmission oil to operating temperature.

3. Run the engine at HIGH IDLE.

4. Observe the pressure on the gauge. The pressure should be 700 ± 70 kPa (100 ± 10 psi).