2053554 Original Excavator Hydraulic Pump Cylinder Block Rotor for ZX120-3

The Hitachi original excavator hydraulic pump cylinder rotor (universal part number: 2053554) is the core rotating component of the axial piston hydraulic main pump. This original spare part is mainly used for the hydraulic main pump of Hitachi's multiple medium and large excavators, commonly found in ZX series models such as ZX200, ZX210, ZX240, ZX250, ZX270, ZX330, ZX350, ZX360, ZX450, ZX470, as well as variable displacement piston pumps from brands such as Kawasaki or Rexroth installed in the corresponding EX series (such as EX200, EX210, EX240, etc.). The core of the pump is composed of the cylinder rotor, plunger, slide shoe, and distribution plate.
 

The cylinder rotor is a key power conversion component for achieving oil suction and pressure actions in the hydraulic main pump. Its core function is to rotate at high speed under the drive of the drive shaft, driving the pistons distributed around its circumference to reciprocate in the plunger hole under the action of the inclined plate or swing frame, thereby periodically changing the sealing chamber volume, completing the suction and high-pressure discharge of hydraulic oil.
 

The maintenance of the cylinder rotor is closely related to the maintenance of the entire hydraulic system, and its lifespan largely depends on the cleanliness of the hydraulic oil. Firstly, it is necessary to strictly replace the hydraulic oil and all hydraulic filter elements (suction filter, return filter, pilot filter) according to the maintenance cycle (usually every 2000 working hours or annually), and use high-quality anti-wear hydraulic oil that meets the original factory standards. This is the most critical measure to prevent abnormal wear or tear of the plunger hole and plunger due to pollution.