723-47-27501 723-47-27506 723-48-27501 PC400LC-8

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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.