The internal leakage in a hydraulic distributor is typically caused by excessive wear on the spool valve. As a precision component, the spool valve is difficult and expensive to repair. Fortunately, there is a cost-effective and long-term solution that can be implemented without major modifications. Here's how it works.
The E512 combine harvester uses a bidirectional distributor, but in practice, it is often operated in a unidirectional manner. At the rear of the distributor, there are two tubing connections—both leading to the cylinder. Normally, the upper connection is used for the oil line, while the lower one is plugged and remains unused. This means the lower port is essentially in a dormant state during normal operation.
When internal leakage occurs, a simple fix is to swap the positions of the oil lines and the plugs between the upper and lower ports. If the bends of the oil lines don’t match exactly, you can gently adjust them, but be careful not to apply too much force, as this could cause the pipe to come loose. After swapping, make sure to operate the distributor handle in the opposite direction. While this may feel unusual at first, it doesn’t cause any other issues, just a short period of adjustment.
Important Note: Never reverse the oil lines on the front side of the distributor (the ones connected to the gear pump). Doing so could lead to serious problems such as a damaged gear pump, ruptured hoses, or complete failure of the hydraulic system. Always double-check the connections before making any changes.
This method offers a practical and economical way to address internal leakage without replacing the entire distributor. It’s a useful technique for farmers and technicians looking for quick, effective solutions in the field. By understanding the design and function of the hydraulic system, you can extend the life of your equipment and avoid costly repairs.
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