Quick Answer The CAT 320GC uses the A28VO130 hydraulic pump group, listed under five order numbers — 489-3483, 531-9885, 567-9721, 593-8367 and 655-8833. It weighs about 190 kg and packs in a 77 × 67 × 75 cm case.Here is the money-saving principle in one line: on this machine, most "pump problems" are not pump problems. The 320GC uses an electronically controlled pump with intell...