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723-47-27501: This appears to be the part number for the main pump assembly.
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723-47-27506: This is likely a variation of the main pump assembly, possibly with different specifications or features.
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723-48-27501: This appears to be the part number for the swing motor assembly.
As for the specification, the Komatsu PC400LC-8 is a large hydraulic excavator used in construction and mining applications. Some of its key specifications and features include:
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Operating weight: 40,950 kg (90,400 lbs)
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Engine power: 257 kW (345 hp)
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Bucket capacity: 1.9-3.6 cubic meters (2.5-4.7 cubic yards)
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Max digging depth: 8.27 meters (27.1 feet)
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Max digging reach: 12.27 meters (40.3 feet)
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Advanced hydraulic system with multiple working modes for improved efficiency and control.