MOTOR GP-PLV- 4689845 - Caterpillar

Illustration 1 g02987996
Table 2
Torque Specifications    
Callout    Torque    
Locknut (2)    
18 4 N m (159 35 lb in)    Introduction
The main relief valve for the transmission maintains the maximum pressure of the oil delivered to the clutches by the modulating valves. Also, the main relief valve protects the transmission hydraulic system from any high-pressure spikes. The following test procedure will verify whether the pressure setting is within the specified limit. The adjustment procedure provides the information that is needed to adjust the main relief valve to the specified limit.Required Tools
Illustration 2 g02571852
Tooling (A)
Table 3
Required Tools    
Tool    Item    Qty    Part No    Description    
A         198-4240     Digital Pressure Indicator Gp    
    A1     1     198-4234     Digital Indicator    
A2 1     198-4238 (1)     Pressure Sensor Gp
(0 to 34,450 kPa (0 to 5,000 psi))    
A3 1     198-4236     Adapter Cable As    
( 1 ) This sensor must be purchased separately, and is not included in the 198-4240 Digital Pressure Indicator Gp Test Preparation - Transmission Relief Valve
Move the machine to a smooth horizontal location.
Permit only one operator on the machine. Keep all other personnel away from the machine or in the sight of the operator.
Place the steering control lever in the NEUTRAL position.
Engage the parking brake.
Lower the attachments to the ground.
Stop the engine.
Turn the key to the ON position, but do not start the engine.
Verify that the implement shutoff control is in the UNLOCKED position.
Move the control levers through the full range of travel several times. This action should relieve any pressure that may be present in the implement hydraulic system.
Loosen the filler cap on the hydraulic tank so that the pressure in the tank is released. The machine may be equipped with a breaker valve. The breaker valve will be located on top of the tank. To release the pressure of the tank, press the button on top of the breaker valve (if equipped).
Tighten the filler cap on the hydraulic tank.
Make sure that the pressure in the entire hydraulic system has been released.
Turn the key to the OFF position.ReferenceRefer to Troubleshooting for additional guidance for preparing the machine for testing.Note: The monitoring system (if equipped) for your machine accesses many values that are useful in troubleshooting the power train system. When the situation is appropriate, use the monitoring system in order to find a pressure or determine a system problem.Test Procedure - Transmission Relief Valve
Perform steps in the "Test Preparation - Transmission Relief Valve" section.
Illustration 3 g02988016
View of the rear cover of the transmission
Install Tooling (A) onto pressure tap (P6) .
Warm the transmission oil to operating temperature.
Run the engine at HIGH IDLE. Note the pressure on the gauge. The pressure should be 2690 150 kPa (390 22 psi).
If the pressure that is observed is not 2690 150 kPa (390 22 psi), perform the steps in "Adjustment Procedure - Transmission Relief Valve".Adjustment Procedure - Transmission