GASKET 4N6853 - Caterpillar

Personal injury can result from hydraulic oil pressure and hot oil.Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system.Make sure all of the attachments have been lowered, oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.
Specifications
Table 1
D6T Pressure Test for the Transmission Torque Converter and the Outlet Relief Valve
Date Equipment ID Code
Item Specification Actual
High Idle at Pressure Port (N) 415 90 kPa (60 13 psi) Introduction
The relief valve (torque converter outlet) maintains a minimum oil pressure in the torque converter.Follow this procedure to adjust the pressure setting for the relief valve (torque converter outlet).Required Tools
Illustration 1 g02571852
Tooling (A)
Table 2
Required Tools
Tooling Item Part
Number Description QTY
A 198-4240 Digital Pressure Indicator Group
A1 198-4234 Digital Pressure Indicator 1
A2 198-4237 Pressure Sensor (0 psi to 500 psi) 1
A3 198-4236 Adapter Cable Assembly 1 Test Preparation
Move the machine to a smooth horizontal location.
Lower all the implements.
Shut off the engine.
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 to release any pressure in the hydraulic system.
Illustration 2 g06002044
The pressure tap for the torque converter inlet relief valve is located behind the access door on the right fender of the machine.
(M) Pressure Tap for the Torque Converter Inlet
(N) Pressure Tap for the Torque Converter Outlet
(6) Transmission
Attach tooling (A) to pressure tap (N).Test Procedure
Start the engine. Warm the power train oil to a temperature of 80° 5°C (176° 9°F).
Operate the engine at HIGH IDLE.
Check the pressure at tooling (A). The correct pressure should be 415 90 kPa (60 13 psi).Adjust Procedure
Illustration 3 g01195460
If the pressure is incorrect, install spacers (2) or remove spacers to change the pressure of the outlet relief valve (1).Note: One spacer changes the pressure setting by 16.5 kPa (2.4 psi). Adding spacers increases the pressure and removing spacers lowers the pressure.Reference: Refer to the procedures in Disassembly and Assembly, "Torque Converter Outlet Relief Valve" in the Service Manual for your machine.