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Determine the fault location of the load car
Agricultural machinery, especially engines that can't be moved due to issues like axle pull (or burning), camshaft failure, or cylinder pulling, is often referred to as a "load vehicle." When such a problem occurs, blindly disassembling the engine can be time-consuming and inefficient. So, how can you accurately identify the fault in a load vehicle?
When an axle pulls or burns, the wear-resistant alloy layer on the bearing may flake off into fine powder, which then mixes with the engine oil. Some of this debris is pumped through the oil passages by the oil pump and gets stuck on the filter element. Therefore, the first step in diagnosing a load vehicle is to open the oil filter cover and inspect the surface of the filter for any signs of alloy powder. If present, it's likely an axle pull or burn.
After confirming the axle issue, the next step is to check each connecting rod for axial clearance. If everything looks normal, proceed to remove the main bearing caps one by one and inspect the main shaft for signs of scoring or burning. If no alloy powder is found, the problem might be with the camshaft—either burned or pulled.
In such cases, the thrust screw on the timing gear chamber cover should be removed. Then, use a crowbar to gently push the camshaft along its axis. If it doesn’t move, it’s likely burned. However, if it moves freely without resistance, the issue may instead be a cylinder pull. This method helps pinpoint the exact location of the fault without unnecessary disassembly, saving both time and effort.
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Determine the fault location of the load car