4635645: This is a part number for a Caterpillar hydraulic cylinder.
K3V280SH141L-OE23-V: This is a model number for a hydraulic axial piston pump manufactured by Kawasaki. Some specifications for this pump include:
Maximum operating pressure: 380 bar (5,511 psi)
Maximum speed: 1,800 rpm
Displacement: 280 cc/rev
K3V280_2: This is also a model number for a hydraulic axial piston pump manufactured by Kawasaki. Some specifications for this pump include:
Maximum operating pressure: 350 bar (5,076 psi)
Maximum speed: 1,800 rpm
Displacement: 280 cc/rev
I hope this information is helpful! Let me know if you have any further questions.