Here are some general specifications for the K5V212 hydraulic pump:
Maximum pressure: 34.3 MPa (4965 psi)
Maximum flow rate: 423 L/min (112 gallons/min)
Displacement: 207 cc/rev
Weight: Approximately 113 kg (249 lbs)
As for the excavator models you mentioned, here are some general specifications:
Caterpillar 345D:
Operating weight: 48,500 kg (106,924 lbs)
Engine power: 317 kW (425 hp)
Maximum digging depth: 7.72 m (25 ft 4 in)
Caterpillar 349D:
Operating weight: 98,200 kg (216,264 lbs)
Engine power: 382 kW (512 hp)
Maximum digging depth: 11.2 m (36 ft 9 in)
Sany SY385:
Operating weight: 37,200 kg (82,012 lbs)
Engine power: 250 kW (335 hp)
Maximum digging depth: 6.83 m (22 ft 5 in)