GEAR 7E4365 - Caterpillar

Test for the Pilot Pressure
Note: The charge pressure of the transmission should be tested before the pressure of the PTO is tested. If the charge pressure of the transmission is incorrect, the pressure of the PTO will be affected. Refer to System Operation and Testing and Adjusting, "Pressure Tests".
Table 1
Tools Needed    
Quantity     Part Number     Description    
2     8-T0855     Pressure Gauge
The gauge should have a range of zero to
1000 kPa (150 psi).    
1     128-5890     Fitting    
1     6V-4144     Coupler Assembly    
1     6V-3965     Nipple Assembly    
1     3J-7354     O-Ring Seal    
2     3J-1907     O-Ring Seal    
Illustration 1 g00504387
Connect an 8T-0854 Pressure Gauge to nipple assembly (1) and (2).
Start the Engine. Warm the oil to 60°C (140°F).
Set the engine speed to 1900 rpm. The pressure reading on the gauge that is connected nipple assembly (1) should be 1415 110 kPa (205 15 psi).
Illustration 2 g00504413
If the pressure is above 1830 70 kPa (265 10 psi), orifice (3) in the right end of the valve housing is plugged.
The pressure on the gauge that is connected to nipple assembly (2) should be 0 kPa (0 psi).Note: This pressure is not the brake pressure for the PTO.Pressure Test for Clutch Engagement
Table 2
Tools Needed    
Quantity     Part Number     Description    
2     8-T0855     Pressure Gauge
The gauge should have a range of zero to
1000 kPa (150 psi).    
1     128-5890     Fitting    
1     6V-4144     Coupler Assembly    
1     6V-3965     Nipple Assembly    
1     3J-7354     O-Ring Seal    
2     3J-1907     O-Ring Seal    
Illustration 3 g00504387
Connect an 8T-0854 Pressure Gauge to nipple assembly (1) and (2) .
Start the Engine. Warm the oil to 60°C (140°F).
Set the engine speed to 1900 rpm. The pressure reading on the gauge that is connected nipple assembly (1) should be 1415 110 kPa (205 15 psi).
The pressure on the gauge that is connected to nipple assembly (2) should be 0 kPa (0 psi).
Engage the PTO. The Pressure reading on the gauge that is connected to nipple assembly (1) should drop to 0 kPa (0 psi).
The pressure reading on the gauge that is connected to nipple assembly (2) should modulate from 0 kPa (0 psi) to 690 kPa (100 psi) in 1.5 seconds. After 1.5 seconds, the pressure should rise immediately to 1830 70 kPa (265 10 psi).