31Q7-10050: This appears to be a part number for a hydraulic cylinder used in heavy machinery. Without more context it is difficult to provide specific specifications for this part.
K3V112DT-1DFR-9N62: This is a model number for a hydraulic pump made by Kawasaki Precision Machinery. Here are some specifications:
Displacement: 112 cm³/rev
Max pressure: 34.3 MPa (4970 psi)
Max speed: 2600 rpm
Weight: 142 kg (313 lbs)
R250LC-9S: This is a model number for a hydraulic excavator made by Hyundai Construction Equipment. Here are some specifications:
Operating weight: 26,500 kg (58,420 lbs)
Engine power: 184 kW (246 hp) at 2000 rpm
Max digging depth: 6,430 mm (21 ft 1 in)
Max reach at ground level: 9,720 mm (31 ft 10 in)