9184686 YA00035150 9199338 main pump device ZX450 ZX470 ZX470-5G K5V200DPH K5V200DPH-NX82R-OE11 excavator hydraulic pump suitable for HITACHI

What is a piston pump and what is a gear pump?
The hydraulic pump converts mechanical energy into liquid pressure energy. We generally see (excavators, loaders) gear pumps and piston pumps.
Common: both are pressures on the liquid through volume changes.
The difference: different institutions, different volume positions. The liquid volume of the gear pump is between the two gears, and the volume of the liquid is changed by the rotation of the gear. The volume of the plunger pump is in each plunger cylinder.

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