New holland combine hydraulic pump repair , Iran

The hydraulic pump of a New Holland combine is typically an axial piston type with a swash plate design or, in some models, a vane type with a flow capacity between 90 and 130 liters per minute. This pump can generate an operating pressure range of 220 to 260 bar and is mainly responsible for powering the steering system, cutting cylinders, and feeding mechanisms. Correct pump type selection and monitoring of output flow under heavy working conditions are crucial to prevent efficiency loss and hydraulic oil overheating.

The mounting location of the New Holland combine hydraulic pump is usually on the engine’s side, close to the main gearbox. This placement allows the pump to receive direct mechanical power from the drive shaft, and the connection is commonly made via a flange coupling. At this point, high-pressure lines and return hoses to the hydraulic reservoir are installed, which must be sealed with O-rings designed to withstand pressures up to 250 bar to avoid leakage.

Repairing the New Holland combine hydraulic pump involves disassembling internal components, inspecting pistons, valves, and bearings, and measuring tolerances precisely with a digital micrometer. If wear greater than 0.05 millimeters or cracks in the housing are detected, the affected parts must be replaced. After reassembly, the pump undergoes a final bench test at 240 bar pressure and 100 liters per minute flow rate. This process ensures the system can deliver stable pressure and flow under demanding field conditions.
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