Komatsu PC400-6 travel pump repair , Iran

The travel hydraulic pump of the Komatsu PC400-6 excavator is an axial piston pump with variable displacement, specifically designed to supply the required traction force. Its operating pressure is approximately 320 bar, and the flow rate ranges between 180 to 220 liters per minute. The drive shaft, with a diameter of 50 millimeters, is supported by rolling bearings, while the pump body is constructed from high-strength alloy steel with superior wear resistance. Precision-engineered oil channels and internal valve plates minimize internal leakage and maintain volumetric efficiency above 90 percent.

Pump performance is highly influenced by operating pressure and hydraulic oil condition. A flow rate drop below 160 liters per minute or a pressure loss exceeding 15 percent indicates piston wear, bearing damage, or valve plate issues. Excessive oil temperature above 85 degrees Celsius can damage O-rings and cause internal leakage. Unusual vibration and knocking noise during movement are also key indicators of travel pump malfunction.

The repair process involves complete disassembly, careful inspection of pistons, valve plates, and bearings, and replacement of worn or damaged components. After cleaning and reassembly, bolts are tightened to specified torque values, and the pump is bench-tested at 300–320 bar and 180–220 liters per minute** flow rate. This ensures smooth operation and extended service life of the excavator’s travel hydraulic system.
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