Carter 320B hydraulic motor, what is it? Is it a hydraulic pump, a walking motor, or a slewing motor?

Carter Excavator 336D2L Single Injector Hydraulic Pump Assembly 476-8766, 4768766

Carter Hydraulic Pump Lip Oil Seal 295-9695, 2959695

Carter 330CL hydraulic pump rear cover

627-1304 Lifter for hydraulic pumps in Carter 395 excavator

Komatsu PC300-5 hydraulic pump pump barrel + plane + distribution plate,

Komatsu PC300-5 hydraulic pump plunger,

Komatsu PC300-5 hydraulic pump nine holes,