BUSHING 5527766 - Caterpillar

Probable Causes
Diagnostic codes
Electrical power supply to the Electronic Control Module (ECM)
Electrical connectors
Personality module or incorrect engine software
Flash file
Engine speed signal
Air inlet and exhaust system
Fuel supply
Engine shutdown switches (if applicable)
Rack controls
Combustion
Overspeed protectionRecommended Actions
Diagnostic Codes, and Electrical Power Supply to the ECM
Certain diagnostic codes may prevent the engine from starting. Connect Caterpillar Electronic Technician (ET) and check for active codes and/or for logged codes. Troubleshoot any codes that are present before continuing with this procedure.Note: If Cat ET will not communicate with the ECM, the problem is most likely with the electrical power supply to the ECM. Refer to Troubleshooting, "Electrical Power Supply - Test".Electrical Connectors
Disconnect the J14/P14 ECM connector. Inspect each connector for moisture and corrosion. Also, inspect the harness from the ECM to the sensors. Refer to Troubleshooting, "Electrical Connectors - Inspect".Personality Module or Incorrect Engine Software
Check for a active 252-11 diagnostic code. Also, check for a active 252-12 diagnostic code. Refer to Troubleshooting, "ECM/Personality Module - Test" if the code is present.Flash File
Verify that the latest flash file has been installed into the ECM.Engine Speed Signal
Crank the engine and observe the engine speed on the Cat ET status screen. If Cat ET indicates zero rpm, refer to Troubleshooting, "Engine Speed - Test".Note: Upon initial cranking, the status for engine speed may indicate that the engine speed signal is abnormal. This message will be replaced with an engine speed once the ECM is able to calculate a speed from the signal.
Ensure that the timing reference gear is installed correctly. The engine will not start if the gear was installed backward. Check for proper orientation between the crankshaft and camshaft drive gears. Correct the orientation and/or replace the drive gear, if necessary. Refer to the Disassembly and Assembly manual.Air Inlet and Exhaust System
Check the air filter restriction indicator for a plugged filter. If necessary, service the engine. Refer to the Operation and Maintenance Manual.
Check the air inlet and exhaust system for restrictions and/or leaks. Refer to Systems Operation/Testing and Adjusting.Fuel Supply
Visually check the fuel level. Do not rely on the fuel gauge only. If necessary, add fuel. If the engine has been run out of fuel, it will be necessary to prime the fuel system. Refer to Operation and Maintenance Manual for the correct procedure.
Check the fuel lines for the following problems: restrictions, collapsed lines and pinched lines. If problems are found with the fuel lines, repair the lines and/or replace the lines.
Check the fuel tank for foreign objects which may block the fuel supply.
Prime the fuel supply system if any of the following procedures have been performed:
Replacement of the fuel filters
Service on the low pressure fuel supply circuitNote: A sight glass in the supply line is helpful in diagnosing air in the fuel. Refer to the Systems Operation/Testing and Adjusting manual for more information.
Cold weather adversely affects the characteristics of the fuel. Refer to the Operation and Maintenance Manual for information on improving the characteristics of the fuel during cold weather operation.Engine Shutdown Switches (if applicable)
The engine shutdown