How to Solve Caterpillar Loader Machine Trouble Code 1239-1

Caterpillar loader machine trouble code 1239-1 can be a frustrating issue to deal with, especially when there is no known permanent solution. However, there are steps you can take to troubleshoot and potentially resolve this problem. In this article, we will discuss the possible causes of this trouble code and provide a solution to help you address the issue.

Firstly, it is important to understand that the diagnostic trouble code 1239-1 indicates a “Fuel Rail Pressure is Low” problem, even if there is no apparent leakage in the machine. This issue affects the following Caterpillar machines: Compact Track Loader 299D2 (S/N: FD21-UP; BY41-UP), 299D2 XHP (S/N: DX21-UP; DX91-UP), Multi Terrain Loader 297D2 (S/N: BL71-UP), 297D2 XHP (S/N: HP21-UP), and Skid Steer Loader 272D2 (S/N: BL21-UP), 272D2 XHP (S/N: MD21-UP).

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To solve the Caterpillar loader machine trouble code 1239-1, you can follow the solution outlined below:

1. Check for lack of fuel to the engine:
– If the trouble code only occurs when the fuel tank is low, this is likely the cause of the issue.
– When traveling across a slope with an angle of 18.4 degrees, if the fuel tank is less than a quarter full, the fuel tank pickup tube may be above the fuel level, resulting in low fuel pressure.
– Remove the fuel tank cap and check if air vents when the cap is removed. If air vents, replace the fuel cap. Also, inspect the inside of the fuel cap for a missing orange diaphragm and replace the cap if necessary.
– Check the fuel filters for any clogs. Note the hours on the fuel filter and visually inspect the lift pump screen for clogging. Replace the fuel filter and lift pump filter if needed.
– Verify that the lift pump creates approximately 83 kPa (12 psi) of pressure when dead-headed.
– Check that the lift pump flow is approximately 0.5 gpm with free flow.

2. Check the wires for the rail pressure sensor (A), pressure discharge valve (B), and pre-stroke control valve (PCV) (C):
– Ensure that the wires are not bent excessively or pulled tight at the connector.
– Look for any damage or wear on the wires.
– If any issues are found, replace or repair the affected wires.

By following these steps, you can effectively troubleshoot and potentially resolve the Caterpillar loader machine trouble code 1239-1. However, it is important to note that until a permanent solution is known, using the provided solution is the best course of action. Regular maintenance and thorough inspections of the fuel system can also help prevent this issue from occurring in the future.

Remember, if you are unsure or uncomfortable performing these troubleshooting steps, it is always recommended to consult with a qualified technician or Caterpillar service representative to ensure proper diagnosis and resolution of the problem.

More repair case for Caterpillar machine,please refer to:Caterpillar Machine Repair

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