Complete Hydraulic System Components
Small Excavators (3-10 tons)
Main Pumps: 423-0097, 397-3941, 214-1091, 4I-1023, 348-7627, 7Y-4002, 247-7867, 358-5004
Compatibility: 305.5E, 306E, 307D, 308E, 312D, 317, etc.
Pilot/Gear Pumps: 126-2016, 284-3536
Medium Excavators (20-36 tons)
Main Pumps: 272-6959, 289-7917, 272-6955, 259-0815/10 R-8707, 451-9302, 341-2860, 567-9721, 593-8367, 436-6669, 438-1293, 244-8479, 272-6957, 339-0513, 123-2233, 126-2073, 119-5407, 497-8499, 114-0602, 0R-8102
Rotary Pumps: 204-4916, 204-4922
Pilot/Gear Pumps: 175-6253, 397-6960
Large Excavators (over 37 tons)
Main/Rotary Pumps: 369-9655, 593-3840, 584-0380, 627-1304, 295-9426, 550-4341, 194-8259, 361-0718, 353-5691, 362-8488, 510-7950
Compatibility: 336GC, 340, 345, 349, 374F, 385, 390F, 395GC, etc.
Pilot/Gear Pumps: 564-9801, 234-4638
Frequently Asked Questions
What is the part number for the main pump of Cat 320D?
Common main pump part numbers for Cat 320D include 272-6955 and HPV145 (OEM collaboration model).
How to store a spare Cat hydraulic pump?
Store the pump in a clean, dry, and ventilated area, seal all ports to prevent contamination, and avoid placing heavy objects on it.
What is the difference between a fixed-displacement and variable-displacement Cat pump?
Fixed-displacement pumps deliver a constant flow rate at a given speed, while variable-displacement pumps adjust flow based on system demand, improving energy efficiency.
What causes a hydraulic pump to lose pressure?
Pressure loss is caused by internal pump wear, leaking seals, a faulty relief valve, or air in the hydraulic system.
Are Cat hydraulic pumps compatible with biodegradable hydraulic oil?
Yes, but only if the oil meets Cat's specifications and is compatible with the pump's seal materials; consult a dealer for recommendations.
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