OEM Parts for Hitachi EX400-5 Main Pump | Tonkee®

Piston Assembly: The piston assembly consists of pistons, piston rings, and a cylinder block.

These components generate hydraulic pressure by reciprocating inside the cylinder block.

Valve Plate: The valve plate controls the flow of hydraulic fluid within the main pump. It contains various valves that open and close to direct the fluid to different hydraulic circuits.

Drive Shaft: The drive shaft connects the main pump to the prime mover, such as an engine or motor. It transfers rotational power to the pump, enabling it to operate.

Swash Plate: The swash plate converts the rotational motion of the drive shaft into reciprocating motion of the pistons. It controls the stroke and displacement of the pistons, which affects the hydraulic flow rate.

Bearings: Bearings support rotating components and reduce friction. They ensure smooth operation and help with load distribution within the pump.

Seals and O-rings: Seals and O-rings are crucial for preventing leaks and maintaining hydraulic pressure.

They are used in various locations to create a tight seal between moving parts.

Housing: The housing encloses and protects the internal components of the main pump. It provides structural support and helps dissipate heat generated during operation.

Lubrication System: Main pumps often have a lubrication system that ensures proper lubrication of moving parts, reducing wear and extending the lifespan of the pump.

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