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Repairing the hydraulic pump of the John Deere 955 combine requires a precise inspection of the mounting position and its connection to the main hydraulic system. The pump is usually located on the engine’s side, near the high-pressure hose lines, and supplies hydraulic oil for the lifting cylinders and steering system. Its mechanical connection is often made using a flange or direct coupling to ensure smooth power transfer without vibrations. During the repair process, it is critical to make sure no leakage remains around O-rings and hose joints.
Reputable brands that provide spare parts for the John Deere combine hydraulic pump include Sauer Danfoss, Bosch Rexroth, and Parker, all known for producing components with tight tolerances. During overhaul, it is recommended to use original repair kits and bearings designed to withstand pressures up to 250 bar. In addition, wear on vanes or pistons should be checked with a digital caliper and micrometer to guarantee precision and maintain proper pump efficiency.
A key stage in the John Deere 955 pump repair process is the final pressure and flow test after reassembly. This test is typically carried out with a hydraulic test bench capable of simulating operating pressures up to 300 bar. The flow rate should remain within the range of 60 to 80 liters per minute to ensure optimal performance. If any noticeable drop in flow or pressure occurs, the sealing system and inlet and outlet ports must be rechecked to prevent further failures during field operation.
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