D6N Track-Type Tractor Power Train Caterpillar

Introduction

The torque converter outlet relief valve maintains a minimum pressure in the torque converter.

The following test procedure will verify whether the pressure setting is within the specified limit. The pressure setting may be adjusted by adding or removing spacers.

Required Tools

Illustration 1	g01291479

Test Procedure

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Illustration 2	g01263956

1. Attach gauge (A) to pressure tap (N).

2. Warm the transmission oil to operating temperature.

3. Run the engine at HIGH IDLE. Fully depress the brake pedal. Disengage the parking brake. Put the torque converter in a stalled condition with the transmission in third speed forward. Note the pressure on the gauge. The pressure should be 410 ± 50 kPa (60 ± 7.5 psi).

   Note: This pressure pertains to a test that is done on the machine. The 410 ± 50 kPa (60 ± 7.5 psi) is not a bench test specification.

4. If the pressure that is observed is not 410 ± 50 kPa (60 ± 7.5 psi), perform the steps in "Adjustment Procedure".

Adjustment Procedure

1. Shut off the engine.

2. Remove the torque converter outlet relief valve. The torque converter outlet relief valve is located at the back of the torque converter housing. Refer to Power Train Disassembly and Assembly, "Torque Converter Outlet Relief Valve - Remove" for your machine.
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   Table 2

   SPACER CHART Pressure Change To The Valve By Removal Or Addition Of One Spacer
   Part Numbers for Spacers (2)	Thickness	Change in Pressure	Location
   4M-1751 Spacer	0.40 mm (0.016 inch)	19 kPa (2.7 psi)	Torque Converter Outlet Relief Valve
   5S-7001 Spacer	0.90 mm (0.035 inch)	40 kPa (6.0 psi)

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   Illustration 3	g00839524
   Torque converter outlet relief valve

3. Add spacers (1) or remove spacers (1), as needed. Refer to Power Train Disassembly and Assembly, "Torque Converter Outlet Relief Valve - Disassemble" for your machine. Refer to Table 2 for the specifications for the spacers.

4. Assemble the torque converter relief valve. Refer to Power Train Disassembly and Assembly, "Torque Converter Outlet Relief Valve - Assemble" for your machine.

5. Install the torque converter relief valve. Refer to Power Train Disassembly and Assembly, "Torque Converter Outlet Relief Valve - Install" for your machine.

6. Perform Step 3 and Step 4 in "Test Procedure" in order to check the pressure at gauge (A).

7. If the pressure is at the specified limit, the test is complete.