The internal leakage in a hydraulic distributor is typically caused by excessive wear on the spool valve. As a precision component, repairing the spool valve can be both complex and expensive. Fortunately, there's an effective and cost-efficient method that doesn't require permanent modifications. Here's how it works.
The E512 combine harvester uses a bidirectional distributor, but in practice, it's often used as a unidirectional unit. At the rear of the distributor, there are two tubing connections—both leading to the cylinder. Normally, the upper connection is used for the hydraulic hose, while the lower one is capped off and left unused. This means the lower port is essentially in a dormant state during regular operation.
When internal leakage occurs, a simple and temporary fix is to swap the positions of the oil hoses and the plug between the upper and lower connectors. If the bend in the oil hose isn’t perfectly aligned after swapping, you can gently adjust it, but be careful not to apply too much force that could cause the hose to disconnect. After the swap, make sure to operate the distributor’s control lever in the opposite direction. While this may feel unusual at first, it won’t cause any other issues.
Important: Never reverse the hoses on the front side of the distributor (the ones connecting to the gear pump). Doing so can lead to serious problems such as damage to the gear pump, ruptured hoses, or complete failure of the hydraulic system. Always follow this precaution to avoid costly repairs and downtime.
This method is ideal for temporary fixes or when replacement parts aren’t readily available. It’s a practical solution that allows operators to keep the machine running without major intervention. However, it’s recommended to eventually replace the faulty spool valve once proper repair options become available.
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