chopper combine pump repair , Iran

The hydraulic pump of a chopper combine is typically an axial piston or vane type, designed with a flow capacity between 80 and 120 liters per minute. It operates within a working pressure range of 200 to 250 bar and is responsible for supplying hydraulic oil to systems such as lift cylinders, steering, and the feeding mechanism of the cutter. Proper pump type selection and attention to flow capacity are critical to prevent efficiency loss and overheating of the hydraulic oil during harvesting operations.

The installation location of the chopper combine hydraulic pump is usually at the front of the engine, aligned with the power transmission shaft. The connection is often made through direct coupling or flange mounting to ensure mechanical power transfer without energy loss. At this position, high-pressure hoses and return lines to the hydraulic reservoir are attached, requiring precise sealing to prevent leakage and pressure drops. Any shaft misalignment can lead to increased vibration and significantly reduce pump lifespan.

The repair process of the chopper hydraulic pump includes disassembling all components, thoroughly cleaning them, inspecting piston and vane wear, and checking bearing tolerances with 0.01-millimeter accuracy. If scratches or dimensional changes greater than 0.05 millimeters are detected, component replacement is mandatory. After reassembly, the pump must be tested on a hydraulic test bench at 230 bar pressure and 100 liters per minute flow rate. This test ensures proper sealing performance and verifies that the pump can maintain stable pressure for long-term field operation.
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