0030435: This is a part number for a John Deere hydraulic cylinder.
10030434: This is also a part number for a John Deere hydraulic cylinder.
5617554: This is a part number for a Volvo hydraulic cylinder.
2079960: This is a part number for a Caterpillar hydraulic cylinder.
A4VG56: This is a model number for a hydraulic axial piston pump manufactured by Bosch Rexroth. Some specifications for this pump include:
Maximum operating pressure: 450 bar (6,527 psi)
Maximum speed: 3,000 rpm
Displacement: 56 cc/rev
R934B: This is a model number for a Liebherr hydraulic excavator. Some specifications for this excavator include:
Operating weight: 33,800 kg (74,517 lbs)
Engine power: 210 kW (282 hp)
Maximum digging depth: 7,950 mm (26 ft 1 in)
944: This is a model number for a Caterpillar wheel loader. Some specifications for this loader include:
Operating weight: 26,216 kg (57,790 lbs)
Engine power: 222 kW (296 hp)
Bucket capacity (standard): 5.2 m3 (6.8 yd3)
I hope this information is helpful! Let me know if you have any further questions.