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D9T Track-Type Tractor Hydraulic System – Relief Valve (Torque Converter Outlet) Pressure – Test and Adjust

------ WARNING! ------

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.
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NOTICE

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.

Dispose of all fluids according to local regulations and mandates.

Specifications

Table 1
D9T Torque Converter Outlet Relief Valve (Pressure Test)    
Date     Product or Component SN    
Item     Specification     Actual    
Torque Converter Outlet Relief Valve – HIGH IDLE at Pressure Tap (N)     550 ± 70 kPa (80 ± 10 psi)        

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 range. The pressure setting may be adjusted by adding or removing shims.

Required Tools

Illustration 1 g02571852

Tooling (A) 198-4240 Digital Pressure Indicator Gp

Table 2
Required Tools    
Tool     Item     Qty     Part No     Description    
A         198-4240     Digital Pressure Indicator Gp    
    A1     1     198-4234     Digital Indicator    
A2 1     198-4237     Pressure Sensor Gp
(0 to3,445 kPa (0 to 500 psi))    
A3 1     198-4236     Adapter Cable As    

ReferenceRefer to Tool Operating Manual, NEHS0818, “Using the 198-4240 Digital Pressure Indicator Group” for more information on using Tooling (A) .

Test Preparation

  1. Move the machine to a smooth horizontal location.
  1. Lower all of the implements.
  1. Shut off the engine.
  1. Turn the key to the ON position. Make sure that the implement lockout switch is turned to the UNLOCKED position. Move the implement control levers to all positions several times in order to release any pressure in the hydraulic system.

    Illustration 2 g02026714

    (1) Torque converter outlet relief valve

    (2) Torque converter

    (N) Outlet relief valve pressure tap

  1. Attach tooling (A) to pressure tap (N) on torque converter outlet relief valve (1) . The torque converter outlet relief valve (1) is located on torque converter (2) .

Test Procedure

  1. Start the engine. Warm the power train oil to 84° ± 8°C (183° ± 14°F).
  1. Operate the engine at HIGH IDLE. Place the machine in the THIRD GEAR FORWARD position while holding the service brakes.

    Note: Do not stall the transmission for more than 30 seconds at a time.

  1. Check the pressure at tooling (A) . The pressure at tooling (A) should be 550 ± 70 kPa (80 ± 10 psi).
  1. If the pressure at tooling (A) is not within the specified range, perform the following adjustment procedure.

Adjustment Procedure

    Illustration 3 g02026714

    (1) Torque converter outlet relief valve

    (2) Torque converter

    (N) Outlet relief valve pressure tap

  1. The torque converter outlet relief valve (1) is located on torque converter (2) .

    Illustration 4 g01049747

    Torque converter outlet relief valve

    (3) Cover

    (4) Bolts and washers

    (5) 8J-6709 Shim (0.25 mm thick)

  1. Remove bolts and washers (4) . Remove cover (3) in order to gain access to shims (5) .
  1. Add one shim (5) in order to increase the pressure setting or remove one shim (5) in order to decrease the pressure setting. One shim changes the pressure setting by approximately 7.5 kPa (1.1 psi).

    ReferenceRefer to the procedures in Disassembly and Assembly, “Torque Converter Outlet Relief Valve” for more information.

  1. Reassemble the torque converter outlet relief valve.
  1. Perform Step 1 through Step 4 in “Test Procedure” in order to check the pressure at tooling (A) .
  1. If the pressure is at the specified limit, the test is complete.
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