GEAR-PLANETARY 2076939 - Caterpillar

Introduction
The following test will verify whether the pressure of the power train oil that is delivered from the priority valve is within the specified limits. This test will check the pressure when the priority valve is in PRIORITY MODE (high pressure).The priority valve pressure should be set with the following conditions: engine at LOW IDLE, parking brake off and power train oil at operating temperature.Required Tools
Illustration 1 g01089423
Tooling (A)
Illustration 2 g01089425
Tooling (B) ( 6V-7830 Pressure Gauge (Tetragauge))
Table 1
Required Tools    
Tooling    Item    Part
Number    Description    Qty    
A     A1     8T-0855     Pressure Gauge
4000 kPa (580 psi)     1    
A2 6V-3989     Fitting     1    
A3 6V-4143     Coupler     2    
A4 177-7861     Hose As
41370 kPa (6000 psi)     1    
B     B1     8T-0862     Pressure Gauge
500 kPa (72 psi)     1    
B2 8T-0860     Pressure Gauge
40000 kPa (5800 psi)     1    
B3 8T-0855     Pressure Gauge
4000 kPa (580 psi)     1    
B4 6V-3081     Hose As
41500 kPa (6020 psi)     1    
B5 4S-6399     Connector     1    
B6 6V-4144     Coupler     1    Test Procedure
Move the machine to a smooth horizontal location.
Extend the counterweight fully. Engage the parking brake. Turn the engine OFF.
Illustration 3 g01283132
Place the counterweight lock lever in the LOCK position.
Illustration 4 g01286574
Place the counterweight control lock in the LOCK position.
Locate the pressure tap for the priority valve. The pressure tap is on the body of the priority valve. The priority valve is located under the floorplate in the operator station.
Attach tooling (A or B) to the pressure tap on the priority valve.The priority valve will regulate the oil at high pressure in the following conditions:
Engine speed is less than 1300 rpm and the parking brake is off. (The priority valve will remain at high pressure until the engine rpm reaches 1350 rpm.)
A transmission shift is in progress.
The power train oil temperature is less than 40 °C (104 °F). (The priority valve will remain at high pressure until the power train oil temperature reaches 45 °C (113 °F).)
A transmission clutch fill calibration is in progress.
Start the engine. Warm the power train oil to a temperature of 80° 10°C (176° 18°F).
Make sure that the transmission is in NEUTRAL.
Operate the engine at LOW IDLE (800 rpm).
Disengage the parking brake.
Check the pressure at tooling (A or B). The pressure at tooling (A or B) should be 2930 105 kPa (425 15 psi) (high pressure).Note: When the parking brake is engaged the pressure at tooling (A or B) will always be low pressure.ReferenceSee Specifications, Systems Operation/Testing and Adjusting, "Pressure Charts" in this module for additional pressure values.
If the pressure at tooling (A or B) is not within the specified limits, perform the following adjustment procedure.Adjustment Procedure
Illustration 5 g00618395
(3) Priority valve (4) Inlet relief valve (torque converter) (28) Adjustment screw for the torque converter inlet (29) Adjustment screw for the priority valve
Loosen the locknut that