HYDRAULIC AR 4302824 - Caterpillar

Illustration 3 g06213409
HP accumulator-quill
(3) Leak detection plug/port
Table 6
Troubleshooting Test Steps Values Results
14. Check the Leak Detection Ports on the Fuel Accumulator Quill Tubes
A. Turn the keyswitch to the OFF position.
B. Remove the all the leak detection port on each of the fuel accumulator quill tubes.
C. Crank/Start the engine.
D. If the engine can be started. Operate the engine at low idle and high idle.
E. Inspect each of the leak detection ports for signs of fuel leakage.
Fuel Leak
Result: A leak was detected on the accumulator quill tube leak port.
Repair: A failed high-pressure fuel crossover line has been detected. Perform the following procedure:
1. Release the pressure in the high-pressure rail by loosening the end plug on one of the last 2 fuel accumulators. Refer to Testing and Adjusting, "Fuel Rail Pressure - Release" for instructions on how to release the pressurized fuel.
2. Verify that the "Fuel Rail Pressure" reading in Cat ET is 0 8 MPa (1160 psi) prior to servicing the fuel system.
3. Replace the high-pressure fuel crossover line nearest to the leaking accumulator quill tube.
Proceed to Test Step 17.
Result: There were no leaks detected.
Repair: There is a high-pressure fuel leak before the injector bank. Perform the following procedure:
1. Release the pressure in the high-pressure rail by loosening the end plug on one of the last 2 fuel accumulators. Refer to Testing and Adjusting, "Fuel Rail Pressure - Release" for instructions on how to release the pressurized fuel.
2. Verify that the "Fuel Rail Pressure" reading in Cat ET is 0 8 MPa (1160 psi) prior to servicing the fuel system.
3. Remove and inspect all the high-pressure lines between the high-pressure fuel pump and each injector bank. Replace the lines if necessary. Torque the lines to the proper value upon reinstallation.
Proceed to Test Step 17.
15. Check the Torque on the High-Pressure Lines and Quill Tubes
A. Turn the keyswitch to the OFF position.
B. Check the torque on each one of the high-pressure fuel lines and accumulator quill tubes.
Torque
Result: All torque values were within specification.
Proceed to Test Step 16.
Result: The torque values were not all within specification.
Repair: Tighten the lines and/or accumulator quills that were not properly torqued.
Proceed to Test Step 17.
Illustration 4 g06213414
Secondary filter assembly
(4) Injector cooling orifice fitting
Illustration 5 g06213417
Injector cooling circuit supply
(5) Return lines are on the left side of head
(6) Supply lines are on the right side of the head
Table 7
Troubleshooting Test Steps Values Results
16. Check for a Leak into the Injector Cooling Circuit
A. Turn the keyswitch to the ON position.
B. Connect Cat ET.
C. Disable fuel injection by going to Configuration > System Settings> Fuel Injection Enable Status and set the parameter to "Disabled".
D. Turn the keyswitch to the OFF position.
E. Disconnect