SUPPORT ASSEM. 3Y7676 - Caterpillar

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.
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
Pressure Test for the Torque Converter Inlet Relief Valve
Date Equipment ID Code
Item Specification Actual
High Idle (M) 900 70 kPa (130 10 psi) Introduction
Use the following procedure to check the pressure setting for the torque converter inlet relief valve.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 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 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. Engage the parking brake. Turn the engine OFF.
Illustration 2 g03707361
(M) Pressure Tap for the Torque Converter Inlet
(N) Pressure Tap for the Torque Converter Outlet
Attach tooling (A) to pressure tap (M).Test Procedure
Do not warm the power train oil.
Start the engine. Do not warm the power train oil.
Operate the engine at LOW IDLE. Make sure that the steering control lever is in the NEUTRAL position. Slowly increase the engine rpm until HIGH IDLE is reached.
Watch the pressure at tooling (A). The pressure should rise with the engine rpm until the pressure reaches the pressure in the table 1.
The torque converter inlet relief valve is not adjustable. If the pressure continues to rise above what is listed in Table 1, replace the relief valve.Note: The torque converter inlet relief valve is located under the lubrication manifold.Note: The torque converter inlet relief valve is not adjustable. If the pressure is wrong, the relief valve must be replaced.