A4VG71: This is a model number for a hydraulic axial piston pump produced by Bosch Rexroth. Some general specifications include:
Maximum pressure: 450 bar (6,527 psi)
Maximum speed: 3,600 rpm
Displacement range: 71 cc/rev
Available in a range of control options, including hydraulic servo, electric proportional, and manual control
R944C: This is a model number for a hydraulic excavator produced by Liebherr. Some general specifications include:
Operating weight: 40,000 kg (88,200 lb)
Engine power: 220 kW (295 hp)
Bucket capacity range: 1.6 m³ (2.09 yd³) to 4.5 m³ (5.88 yd³)
Maximum digging depth: 7.83 m (25 ft 8 in)
Maximum reach at ground level: 12.1 m (39 ft 8 in)